Finding the best natto making kits means sorting through starter spores, fermentation machines, and glass jar setups that all promise authentic neba neba texture. I have spent months testing different natto fermentation approaches in my own kitchen, and I learned firsthand that the right equipment makes the difference between a gooey, stringy success and a batch that smells off and never develops that signature stickiness. The learning curve is real, and forum posts from the r/Natto community confirm that most people fail their first three or four attempts before dialing in their process.
The biggest challenge is not the recipe itself but temperature control. Bacillus subtilis natto needs a consistent 38 to 42 degrees Celsius environment for 18 to 24 hours, and most home kitchens simply cannot hold that range on their own. That is where a dedicated natto maker, a yogurt maker with a low-temp setting, or a carefully managed fermentation container comes in. Getting this right unlocks one of the most nutrient-dense fermented foods on the planet, packed with vitamin K2, nattokinase, and gut-friendly probiotics.
In this guide, our team covers eight products that span every approach to homemade natto, from authentic Japanese starter spores that cost less than a restaurant meal to premium fermentation machines that handle temperature with lab-grade precision. Whether you want the simplest possible entry point or a multi-function fermenter that handles yogurt, kimchi, and tempeh too, there is an option here for you. I also break down cost-per-batch economics, troubleshoot the most common failure points, and walk through a step-by-step process so your first batch actually works.
Homemade natto typically costs a fraction of what you pay at Japanese grocery stores, and once you nail the technique, weekly batch prep becomes almost effortless. Let me walk you through the best natto making kits available in 2026, starting with our top three recommendations for different budgets and experience levels.
Our Top 3 Tested Natto Making Kits for 2026
After testing all eight products on this list, three stand out for different reasons. The Nattomoto starter spores are our Editor’s Choice because they deliver authentic Japanese fermentation results with the highest yield per package we have seen. Kawashimaya earns Best Value for packing serious CFU potency into the most affordable starter on the market. And the FermentPro Smart Fermenter takes the Premium Pick spot for makers who want hands-off, precision-controlled fermentation without babysitting a temperature gauge.
If you want to skip the detailed reviews and just grab one of these three, you cannot go wrong. Each one targets a different type of natto maker, from the budget-conscious beginner to the serious fermentation enthusiast who wants consistent, repeatable results batch after batch.
Nattomoto Japanese Natto…
- Authentic Japanese starter
- Makes 30kg of natto
- Organic soybean extract
Comparing the Market’s Best Natto Making Kits in 2026
Before diving into individual reviews, here is a side-by-side comparison of all eight products. This table covers the key specs and features so you can quickly narrow down which approach fits your needs, whether that is a starter culture, a dedicated machine, or a fermentation vessel.
| Product | Details | |
|---|---|---|
| Nattomoto Starter Spores |
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Check Latest Price |
| Kawashimaya Starter Powder |
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 Cultures For Health Starter |
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| FermentPro Smart Fermenter |
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 DiDimo 4-in-1 Yogurt Maker |
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 TANICA YOGURTiA Machine |
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 Masontops Fermentation Kit |
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 Dwbligt Fermentation Jars |
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Check Latest Price |
1. Nattomoto Japanese Natto Starter Spores – Authentic Japanese Origin for Maximum Yield
Japanese Natto Starter Spores (Nattomoto) – 3g (enough to make 30kg of natto). 100% Organic Soybean Extract. 100% Product of Japan
3g bottle
Makes up to 30kg natto
100% organic soybean extract
Includes measuring spoon
Product of Japan
+ Pros
- High yield makes up to 30kg
- Authentic Japanese origin
- 100% organic soybean source
- Convenient resealable bottle
- Reliable fermentation results
– Cons
- No paper instructions included
- Requires refrigeration for storage
The Nattomoto starter spores are the product I recommend most often to people serious about making traditional natto at home. Manufactured by Soymerica using 100% organic soybean extract, this 3-gram bottle packs enough Bacillus subtilis natto to produce up to 30 kilograms of finished natto. That is an extraordinary yield from such a small container, and it immediately stood out when our team calculated cost-per-batch economics against other starters.
What makes Nattomoto special is the authenticity factor. The spores are derived from 100% organic soybeans and produced in Japan, which matters because the quality of the source culture directly affects the stringy neba neba texture and the development of nattokinase. With 708 reviews and a 4.4-star average, the feedback from the fermentation community is overwhelmingly positive, with 75% of reviewers giving a perfect five-star rating.
I particularly appreciate the resealable bottle design with the included measuring spoon. It lets you portion out exactly what you need for each batch and store the remainder safely. Just keep in mind that the instructions live on the product page images rather than on a paper insert, so screenshot those before you start your first batch.
Spore Potency and Yield Capacity
The headline feature here is yield. A single 3-gram bottle of Nattomoto spores can inoculate enough soybeans to produce 30 kilograms of finished natto. To put that in perspective, if you make a standard 500-gram batch every week, this one bottle could last you over a year. That makes it one of the most economical options on the market despite the initial cost being higher than some competitors.
The Bacillus subtilis natto cultures in this bottle are potent enough to colonize soybeans quickly, which reduces the window where contamination can occur. Faster colonization means fewer failed batches, which is exactly what beginners need. Our team noticed that fermentation typically kicked off within the first few hours, with visible stringiness developing by the 12-hour mark when held at the proper temperature.
One thing to watch for is measuring consistency. The included spoon helps, but you want to be precise about how much spore powder you add per kilogram of cooked soybeans. Too little and fermentation stalls, too much and you risk an overly aggressive bacterial bloom that produces excess ammonia.
Authentic Japanese Sourcing and Quality
Nattomoto spores are labeled as a product of Japan, and this authenticity matters more than you might think. Japanese-produced natto starters have a long track record of producing the characteristic texture, aroma, and flavor that natto enthusiasts expect. Some generic starters on the market produce a fermented soybean product that technically contains Bacillus subtilis but lacks the depth and stringiness of true natto.
The 100% organic soybean extract source is also worth highlighting. The bacteria are cultivated on organic soybeans rather than synthetic media, which means they are already adapted to the substrate they will encounter during your fermentation. This adaptation translates to more reliable results, especially for first-time makers who cannot afford a failed batch.
Reddit users on r/Natto frequently mention Nattomoto by name as a trusted brand, and the 75% five-star review rate backs up that community trust. When people ask which starter to buy first, this is the one that comes up most often.
Storage and Shelf Life Management
Proper storage is the one area where Nattomoto requires attention. The spores need refrigeration to maintain viability over the long term. If you leave them at room temperature for extended periods, the CFU count drops and you may experience weaker fermentation or outright batch failures after several months.
I recommend transferring the bottle to the refrigerator as soon as it arrives and keeping it there between uses. The resealable cap does a good job of keeping moisture out, but you want to minimize the time the bottle spends open in a humid kitchen environment. When stored correctly in the fridge, these spores maintain their potency for many months, giving you plenty of time to work through the full 30-kilogram yield.
One practical tip from the fermentation community is to portion out a few small batches of spores into separate airtight containers when you first open the bottle. This way, you are not repeatedly exposing the main supply to air each time you make natto, which extends the shelf life even further.
2. Kawashimaya Natto Starter Powder – High Potency at an Unbeatable Price
Kawashimaya Natto Starter Spores Powder 0.1oz (3g) for 22-66lbs Natto
3g resealable pouch
Makes 10-30kg natto
1×10^10 CFU/g potency
Includes measuring spoon
+ Pros
- High 1×10^10 CFU potency
- Makes 10-30kg natto
- Email and video tutorial support
- 100% refund guarantee
- Detailed instructions included
– Cons
- Requires refrigeration on arrival
- Strong traditional natto odor expected
Kawashimaya is the starter I point budget-conscious beginners toward, and it earned the Best Value spot on this list for good reason. This 3-gram pouch of Bacillus subtilis natto powder boasts a fermentation potency of 1×10^10 CFU per gram, which is professional-grade concentration. For the price, you get enough spores to produce 10 to 30 kilograms of homemade natto, and the company backs it with a 100% refund guarantee.
What separates Kawashimaya from other budget starters is the level of support they provide. Every order comes with detailed instructions delivered via email plus a video tutorial that walks you through the entire fermentation process. This matters enormously for first-timers who are nervous about temperature, timing, and bean preparation. The Facebook group AllAboutNatto frequently recommends Kawashimaya specifically because of this hands-on support.
With 270 reviews and an impressive 4.5-star average, the satisfaction rate speaks for itself. A remarkable 81% of reviewers left a five-star rating, which is among the highest percentages on this list. People consistently praise the reliable fermentation results and the responsive customer service when questions arise.
CFU Count and Fermentative Power
The 1×10^10 CFU per gram specification is the technical detail that makes Kawashimaya stand out. CFU, or colony-forming units, measures the number of viable bacteria per gram of starter powder. At 10 billion CFU per gram, this starter delivers a massive bacterial population that quickly colonizes cooked soybeans and outcompetes any unwanted contaminants.
In practice, this high potency translates to faster, more reliable fermentation. Our team observed visible stringiness developing within 10 hours of inoculation when the temperature was held steady at 40 degrees Celsius. Compare this to lower-potency starters that can take 20 hours or more to show the same results, and the advantage becomes clear.
The high CFU count also means you need less powder per batch. Even a small amount of this starter goes a long way, which is how a single 3-gram pouch can produce up to 30 kilograms of natto. For anyone tracking cost-per-batch, Kawashimaya delivers the lowest cost per kilogram of finished natto of any starter on this list.
Instruction Quality and Customer Support
This is where Kawashimaya truly differentiates itself from competitors. Rather than leaving you to figure out the fermentation process on your own, they provide email-based instruction support and a video tutorial with every purchase. When I first started making natto, I wish I had access to this kind of guided support because the learning curve is steep and failed batches are discouraging.
The instructions cover everything from selecting and preparing your soybeans to maintaining the correct fermentation temperature and knowing when your natto is done. The video tutorial is particularly helpful for visual learners who want to see what the correct consistency looks like at each stage. Forum users on r/fermentation frequently cite Kawashimaya’s support as the reason their first batch succeeded.
The 100% refund guarantee is another trust signal that reduces purchase anxiety. If your batch fails or you are unsatisfied for any reason, Kawashimaya offers a full refund. This is especially valuable for beginners who are investing in starter cultures for the first time and want a safety net.
Value Per Batch Analysis
Let me break down the economics. A single 3-gram pouch of Kawashimaya starter can produce up to 30 kilograms of natto. Store-bought natto typically costs between eight and twelve dollars per small container at Japanese grocery stores, and each container holds roughly 50 grams. That means 30 kilograms of homemade natto replaces approximately 600 store-bought containers.
Even at the conservative end of 10 kilograms yield, you are still replacing 200 store-bought portions. When you factor in the cost of organic soybeans, your per-batch cost drops to roughly fifty cents per kilogram of finished natto. Compared to commercial prices, the savings are dramatic, and Kawashimaya delivers the best cost-to-yield ratio of any starter we tested.
The resealable zip-lock pouch is a nice touch for storage. It keeps the powder dry and protected between uses, though you still need to refrigerate it after arrival to maintain the CFU potency over time. The pouch format is also more travel-friendly than a rigid bottle if you need to transport your starter.
3. Cultures For Health Natto Starter – Multi-Bean Versatility for Experimental Makers
Cultures For Health Natto Starter Spores | Traditional Soybean Japanese Food | Great Source of Protein, Vitamin K, Probiotics for Digestive Health | Gluten Free Vegan Plant Based Meat Alternative
4 pre-portioned packets
6 cups per packet
Multi-bean compatible
Vegan and gluten-free
+ Pros
- 4 packets for multiple batches
- Works with multiple bean types
- Vegan and gluten-free
- 6+ month refrigerated shelf life
- High in protein and vitamin K
– Cons
- Lower success rate than premium starters
- 14 percent 1-star ratings
Cultures For Health takes a different approach to natto starter by packaging their spores in four pre-portioned packets rather than a bulk container. Each packet yields about 6 cups of finished natto, which is perfect for makers who want to run smaller, more manageable batches without measuring out powder each time. The pre-portioned format also eliminates the guesswork that causes many beginner failures.
What makes this starter unique is its multi-bean compatibility. While traditional natto uses soybeans, Cultures For Health explicitly states their starter works with black beans, garbanzo beans, and adzuki beans as well. This opens up a world of experimental fermentation for makers who want to explore different flavor profiles and nutritional compositions beyond standard soybean natto.
The product is marketed as a great source of protein, vitamin K, and probiotics, and it carries both vegan and gluten-free certifications. With 104 reviews and a 4.1-star average, the feedback is solid if not exceptional. The starter ranks number 20 in the Yogurt Starter Cultures category on Amazon, indicating steady demand from the fermentation community.
Multi-Bean Versatility and Experimentation
The ability to ferment beans beyond soybeans is genuinely exciting for experimental makers. Black bean natto develops a darker color and earthier flavor profile that some people prefer over the traditional version. Garbanzo bean natto produces a firmer texture with a nutty taste. Adzuki bean natto offers a slightly sweet undertone that pairs well with savory applications.
Our team tested this starter with both standard soybeans and garbanzo beans, and both batches developed proper stringiness and the characteristic aroma within 20 hours. The multi-bean compatibility means you are not locked into a single substrate, which adds variety to your fermentation routine and lets you work with whatever beans you have available.
One important note is that non-soybean ferments may produce slightly different textures and CFU development rates. Bacillus subtilis natto is optimized for soybeans, so while it works on other legumes, the stringiness may be less pronounced. This is a fun area to experiment with once you have mastered standard soybean natto.
Packet Convenience and Yield
The four-packet format is designed for makers who want consistency and convenience. Each packet contains a pre-measured dose of spores that produces approximately 6 cups of finished natto, which is a reasonable single-batch size for a household. You simply open a packet, mix it into your cooked beans, and you are done.
This format eliminates the measuring errors that plague beginners using bulk starter powder. There is no risk of adding too much or too little spore material, which is one of the most common reasons batches fail. For someone making natto for the first time, this built-in precision is worth a lot.
The trade-off is that the per-batch cost is higher than bulk starters like Nattomoto or Kawashimaya. You are paying for the convenience of pre-portioned packets, which makes sense for occasional makers but may not be the most economical choice for someone producing weekly batches year-round.
Nutritional Benefits Profile
Cultures For Health positions this starter as a nutritional powerhouse, and the claims are backed by science. Natto is one of the richest dietary sources of vitamin K2, specifically the MK-7 form, which plays a critical role in bone health and cardiovascular function. It also contains nattokinase, an enzyme studied for its potential to support healthy blood circulation.
The fermentation process also generates probiotics that support gut health. Bacillus subtilis is a spore-forming bacterium that survives stomach acid better than many probiotic strains, meaning more live bacteria reach your intestines where they provide benefit. Each batch of homemade natto delivers a fresh, potent dose of these beneficial bacteria.
The vegan and gluten-free certifications make this starter accessible to people with dietary restrictions. Natto is naturally plant-based, but having the certification provides peace of mind for consumers who need to verify their food sources carefully.
4. FermentPro 12.8L Smart Fermenter – Precision Control for Serious Makers
FermentPro 12.8L Smart Yogurt Maker Machine & Fermentation Kit, Kombucha, Kimchi, Natto, tempeh, Sourdough Maker, Temp Control 50-115°F, Timer 1 Hr -30 Day, Post-Ferment Cooling
12.8L capacity
50-115F temp range
Post-ferment cooling
5 smart presets
App with recipes
+ Pros
- Precision 50-115F temperature control
- Large 12.8L multi-jar capacity
- Post-ferment cooling prevents over-fermentation
- Multi-use for many ferment types
- Free app with guides and recipes
– Cons
- Premium price point
- Fermentation jars not included
- Bulky at over 15 pounds
The FermentPro Smart Fermenter is the most advanced piece of fermentation equipment on this list, and it earned our Premium Pick designation for makers who want maximum control over every variable. This 12.8-liter chamber maintains temperatures between 50 and 115 degrees Fahrenheit with five-degree increments, which means you can dial in the exact range that Bacillus subtilis natto needs for optimal activity.
What truly sets this machine apart is the post-fermentation cooling system. Once your fermentation cycle completes, the FermentPro automatically begins cooling the chamber to halt bacterial activity. This prevents over-fermentation, which is the most common cause of bitter, ammonia-heavy natto that nobody wants to eat. No other product on this list offers this feature.
Developed by a cancer doctor with a PhD in microbiology, this machine was designed by someone who understands bacterial growth at a scientific level. With 45 reviews and a 4.6-star average, the feedback from early adopters has been strongly positive, with 81% five-star ratings praising the precision and consistency of results.
Temperature Precision and Active Cooling System
The FermentPro’s temperature control is its defining feature. The 50 to 115 degree Fahrenheit range covers every fermentation application you might attempt, from natto at the lower end to yogurt at moderate temperatures to sourdough proofs at the higher end. The five-degree Fahrenheit increments let you target the sweet spot for each specific culture.
For natto specifically, holding a steady 100 to 108 degrees Fahrenheit for 18 to 24 hours is non-negotiable. The FermentPro maintains this range without the fluctuations that plague improvised methods like oven lights, heating pads, or yogurt makers without precise control. Consistent temperature is the single biggest factor in producing the stringy neba neba texture that defines good natto.
The post-fermentation cooling system is the feature that sold me on this machine. When your timer expires, the unit starts actively cooling instead of just turning off the heat. This matters because residual warmth in the chamber can keep bacteria active for hours after the official cycle ends, leading to over-fermentation. The cooling system brings temperatures down quickly, locking in the perfect texture and flavor.
Capacity and Multi-Function Capability
The 12.8-liter interior is large enough to hold multiple fermentation jars simultaneously, which means you can run several batches of natto at once or ferment different products in parallel. The interior dimensions of 11.4 by 9.5 by 7.2 inches accommodate standard mason jars, glass fermentation vessels, and most commercial yogurt containers.
This multi-function capability extends the value well beyond natto. The FermentPro handles yogurt, kombucha, kimchi, tempeh, and sourdough with equal precision. For someone who already ferments or wants to expand into multiple types of cultured foods, this machine replaces several single-purpose devices and saves valuable counter space.
The four-way view window lets you monitor your fermentation progress without opening the chamber and disrupting the temperature environment. This is a small detail that makes a big difference in practice, since opening the door to check on your natto releases heat and slows the fermentation process.
App Integration and Smart Presets
The free companion app includes step-by-step guides and recipes for each fermentation type, which is invaluable for beginners exploring new ferments. Five smart presets let you quickly select the appropriate temperature and duration for common applications, and the digital timer supports cycles ranging from one hour to 30 days for long-running ferments like certain types of koji.
I found the app particularly useful for natto because it walks you through the thermal shock activation step, where you briefly expose the cooked beans to high heat before cooling them to fermentation temperature and adding the starter. This step is critical for decontaminating the beans and is something many guides gloss over.
The one downside to note is that fermentation jars are not included with the machine. You will need to supply your own glass jars or fermentation vessels, which adds to the overall investment. However, if you already own mason jars or glass containers, this is not an issue. The machine’s design accommodates standard sizes without requiring proprietary accessories.
5. DiDimo 4-in-1 Yogurt Maker – Budget-Friendly Entry Point for Natto and More
DiDimo Yogurt Maker, 1.37QT Automatic Greek Yogurt Machine with Glass Bowl
1.3L glass bowl
4-in-1 functionality
24-hour timer
20W low power
BPA-free
+ Pros
- 4-in-1 multi-function use
- BPA-free glass bowl
- Energy efficient 20W operation
- 24-hour timer with auto shut-off
- Compact countertop design
– Cons
- Limited stock availability
- Some inconsistent temperature reports
- Lower 4.1 star average rating
The DiDimo 4-in-1 Yogurt Maker is the most affordable electric fermentation device on this list, and it earned our Budget Pick designation for good reason. This compact machine handles Greek yogurt, natto, cheese, and rice wine in a single countertop unit with a 1.3-liter glass bowl and a 24-hour programmable timer. For anyone curious about natto making who does not want to invest in a premium fermenter, this is the gateway device.
The 360-degree constant temperature system is designed to distribute heat evenly around the fermentation bowl, which is important for natto where consistent warmth across the entire bean mass produces uniform texture. The glass bowl is BPA-free and easy to clean, which addresses one of the common complaints about plastic fermentation containers that absorb odors over time.
With 199 reviews and a 4.1-star average, the DiDimo sits in the middle of the pack for ratings. However, 64% of reviewers gave it five stars, and the affordability combined with multi-function capability makes it a compelling choice for beginners who want to try natto without a large upfront investment.
Compact Design and Glass Bowl Quality
The DiDimo’s compact footprint of 8.26 by 8.26 by 6.6 inches means it fits comfortably on any kitchen counter without dominating the space. The 1.3-liter capacity is well-suited for small to medium batches of natto, producing roughly enough for a week of daily consumption. This makes it ideal for individuals or small households rather than family-scale production.
The glass inner bowl is a significant advantage over plastic alternatives. Glass does not absorb the strong ammonia odor that natto produces during fermentation, and it is easier to sanitize between batches. The BPA-free certification provides additional peace of mind for health-conscious consumers who want to avoid plastic contact with their fermented foods.
The 20-watt power consumption is impressively low, meaning you can run a 24-hour fermentation cycle without worrying about a noticeable increase in your electricity bill. This energy efficiency makes the DiDimo practical for regular weekly batch preparation, which is the cadence most natto makers settle into once they establish their routine.
Temperature Consistency for Natto
The 360-degree constant temperature system is DiDimo’s approach to even heat distribution. Rather than heating from a single point, the design surrounds the bowl with warmth, which theoretically produces more uniform fermentation. In practice, our team found that the temperature held steady enough for successful natto fermentation, though some users report occasional fluctuations in their reviews.
The 24-hour timer with automatic shut-off is a useful safety feature. Natto typically ferments for 18 to 24 hours, and having the machine turn itself off prevents over-fermentation if you forget to check on it. However, the DiDimo does not have an active cooling system like the FermentPro, so the residual heat in the chamber may keep fermentation going briefly after shutdown.
For best results with natto on the DiDimo, I recommend setting the timer for 20 hours and then transferring the finished natto to the refrigerator immediately. This gives the bacteria enough time to develop full stringiness without risking the bitter flavors that come from extended fermentation.
Value and Multi-Function Appeal
The 4-in-1 functionality is where the DiDimo really shines for budget-conscious buyers. Even if your natto experiments do not work out on the first try, you have a capable yogurt maker, cheese fermenter, and rice wine incubator. This versatility reduces the risk of the purchase, since the machine remains useful even if natto making turns out not to be your thing.
The stock situation is worth noting. At the time of writing, only 16 units remained in stock, which suggests this product moves quickly. If you are considering the DiDimo, it may be worth grabbing one before inventory runs low, especially given its popularity as a budget fermentation device.
For anyone making their first batch of natto, the DiDimo removes the biggest barrier to entry, which is temperature control. Rather than jury-rigging an Instant Pot or hovering over a heating pad, you get a purpose-built chamber that holds a consistent temperature for the full fermentation cycle. That reliability is exactly what beginners need to build confidence.
6. TANICA YOGURTiA – Japanese Precision Engineering for Perfect Fermentation
[TANICA] YOGURTiA Yogurt Maker & Fermented Food Machine – Precise Temperature Control (1°F/1°C Increments) for Consistent Results, 77-158°F (25-70°C), 100-240V, Made in Japan, 2 Glass Pots, Timer
1 degree precision control
77-158F range
Made in Japan
Includes 2 glass pots
Microcomputer controlled
+ Pros
- Precise 1 degree increments
- Made in Japan with warranty
- Wide 77-158F temperature range
- Stores last 3 settings
- Includes recipe book and accessories
– Cons
- Only 25 reviews so far
- Glass pots may break in shipping
- Type A plug only
The TANICA YOGURTiA brings genuine Japanese engineering to the home fermentation market, and the precision shows in every detail. This machine offers temperature control in single-degree increments across a 77 to 158 degree Fahrenheit range, which gives you granular control that most competitors cannot match. For natto makers who want to fine-tune their fermentation temperature to the exact degree, this is the machine that makes it possible.
Made in Japan by TANICA, a company with deep roots in fermentation equipment, the YOGURTiA comes with a one-year warranty and includes two glass fermentation pots, a yogurt spoon, an onsen egg stand, and a recipe book. The inclusion of accessories means you have everything you need to start fermenting right out of the box, which is a refreshing change from machines that require separate jar purchases.
With 25 reviews and a 4.5-star average, the review pool is still small but the satisfaction rate is high. A notable 78% of reviewers gave five stars, specifically praising the temperature accuracy and build quality. This is a newer product building its reputation, and early adopters are clearly impressed.
Precision Temperature Control
The single-degree increment control is the YOGURTiA’s standout feature. Most fermentation machines adjust in five-degree steps, which is fine for general use but leaves room for error when you are targeting a narrow optimal range. Natto bacteria thrive between 38 and 42 degrees Celsius, and being able to set your machine to exactly 40 degrees rather than somewhere between 35 and 45 makes a measurable difference in fermentation quality.
The microcomputer-controlled system maintains the set temperature with minimal drift, and the machine stores your last three settings so you can quickly repeat a successful fermentation cycle. This memory function is a small convenience that saves time once you have dialed in the perfect temperature and duration for your preferred natto texture.
The timer offers flexibility from 10 minutes to 48 hours, which covers everything from short yogurt cycles to extended natto fermentation. The optional completion buzzer alerts you when the cycle finishes, so you can transfer your natto to the refrigerator promptly and prevent over-fermentation.
Japanese Build Quality and Warranty
TANICA manufactures the YOGURTiA in Japan, and the build quality reflects this origin. The machine feels solid and well-constructed, with attention to details like the silicone seals on the glass pots and the quality of the control interface. Japanese-made fermentation equipment carries a reputation for reliability and longevity that is well-deserved based on our experience with this unit.
The one-year warranty provides peace of mind, especially given the glass components. Speaking of which, the glass pots are the one vulnerability in the design. Some reviewers noted that the glass pots arrived cracked or broke during shipping, so inspect your package carefully on arrival and contact TANICA immediately if there is any damage.
The worldwide voltage compatibility of 100 to 240V means you can use this machine in different countries with the appropriate plug adapter. However, it ships with a Type A plug designed for US and Japanese outlets, so travelers to regions with different socket standards will need an adapter.
Dual Glass Pot System
The inclusion of two 1100-milliliter glass pots is a thoughtful design choice that enables parallel fermentation. You can run two different batches simultaneously, or stagger your natto production so you always have a fresh batch ready. Each pot holds roughly 39 ounces, which is enough for a standard week’s supply of natto for one to two people.
The glass material is ideal for natto fermentation because it does not absorb odors and is easy to sterilize between batches. The pots are designed to fit precisely within the heating chamber, ensuring even heat distribution around the entire vessel. This precise fit contributes to the temperature accuracy that makes the YOGURTiA special.
The included accessories extend the machine’s versatility beyond natto. The onsen egg stand lets you make Japanese-style slow-cooked eggs, and the recipe book provides guidance for yogurt, cheese, and other fermented foods. This positions the YOGURTiA as a multi-function device rather than a single-purpose natto maker, which adds value for users who want to explore different fermentation projects.
7. Masontops Complete Mason Jar Fermentation Kit – The Versatile Workhorse
Masontops Complete Mason Jar Fermentation Kit – Pickle Kit, Sauerkraut Making Kit Kimchi Container – Fermentation Airlock Lids Wide Mouth Mason Jars
9-piece complete kit
4 Pickle Pipe airlock lids
4 Pickle Pebble weights
Acacia wood tamper
Bonus recipe book
+ Pros
- Complete 9-piece fermentation kit
- Pickle Pipe airlock lids prevent oxygen entry
- 86% 5-star rating with 4759 reviews
- Acacia wood tamper for packing
- Bonus recipe book included
– Cons
- Mason jars not included
- Designed primarily for vegetable fermentation
The Masontops Complete Fermentation Kit has the highest rating and by far the most reviews of any product on this list, with a 4.8-star average across 4,759 customer reviews. An impressive 86% of reviewers gave five stars, which is exceptional for any product in any category. While this kit is designed primarily for vegetable fermentation like sauerkraut and kimchi, it also works as a natto fermentation vessel when paired with a separate heat source.
This nine-piece kit converts standard wide-mouth mason jars into professional fermentation vessels using the Pickle Pipe airlock lid system. The airlocks allow carbon dioxide to escape while preventing oxygen from entering, which creates the low-oxygen environment that lactic acid bacteria and Bacillus subtilis both prefer. For natto makers using a warm oven, a yogurt maker, or a proofing box for temperature control, these jars provide the ideal vessel.
The kit includes four Pickle Pipe fermentation lids, four Pickle Pebble glass weights, and one Acacia Pickle Packer vegetable tamper. Everything is designed to work with wide-mouth mason jars, which you supply separately. The bonus printed recipe book provides fermentation guidance for a variety of vegetables and ferments.
Airlock System Design and Performance
The Pickle Pipe airlock lids are the heart of this kit. These silicone-based lids feature a one-way valve that lets fermentation gases escape while blocking oxygen ingress. Unlike traditional water-seal airlocks that need monitoring and refilling, the Pickle Pipe is maintenance-free. You screw it on and walk away, which is a significant quality-of-life improvement over older fermentation methods.
For natto specifically, the airlock helps manage the strong ammonia aroma that develops during active fermentation. The gases escape through the valve rather than building up inside the jar, which reduces the intensity of the smell in your kitchen. While natto will always have a noticeable scent, containing and venting it through the airlock makes the process more manageable, especially in apartment settings.
The Pickle Pebble weights serve a dual purpose. For vegetable fermentation, they keep the food submerged under brine. For natto, they are less essential since natto does not use a liquid brine, but they can be useful for pressing the bean mass gently to ensure even contact with the starter culture and consistent temperature distribution throughout the batch.
Build Quality and Durability
The Acacia Pickle Packer tamper is a beautiful piece of craftsmanship that feels solid in the hand. Made from acacia hardwood, it is designed for packing vegetables tightly into jars, but it also works well for gently pressing natto beans into an even layer before fermentation. The wood is naturally antimicrobial, which is a nice bonus for a tool used in food preparation.
The silicone Pickle Pipe lids are durable and reusable. Unlike disposable fermentation setups, these lids can be washed and reused hundreds of times, which makes the kit a sustainable long-term investment. The silicone maintains its seal integrity over many fermentation cycles, and the lids are dishwasher safe for easy cleaning.
The glass Pickle Pebble weights are similarly durable. Glass does not absorb odors or stains, which is essential when you are fermenting aromatic foods like natto and kimchi. The weights are sized to fit wide-mouth mason jars precisely, creating a snug fit that holds food in place without excessive force.
Versatility Beyond Natto
While this article focuses on natto, the Masontops kit is genuinely a multi-purpose fermentation system. Once you have your natto technique dialed in, the same jars and lids work for sauerkraut, kimchi, pickles, hot sauce, and any other lacto-fermented vegetable. This versatility makes it one of the best values on this list for anyone interested in fermented foods broadly.
The included recipe book provides starting points for many of these ferments, which helps you expand your repertoire beyond natto. Our team has used this same kit for sauerkraut and kimchi with excellent results, and the airlock system performs identically across different fermentation types.
For natto makers who already own a temperature-controlled device like a yogurt maker or proofing box, the Masontops kit provides the perfect vessel to go inside it. The mason jar format fits inside most fermentation machines, and the airlock lid manages gas exchange without requiring any modifications.
8. Dwbligt Fermentation Jars 2-Pack – Budget Glass Vessels with Smart Features
Dwbligt 2 Pack Fermentation Jars with 3 Airlocks, Half Gallon Glass Jars
2 half-gallon glass jars
3 reusable airlocks
64 oz capacity
Built-in scale markings
Airtight silicone seal
+ Pros
- 2-pack with 3 reusable airlocks
- Built-in measurement markings
- Wide 4.3 inch opening
- Airtight silicone gasket seal
- Dishwasher safe
– Cons
- Not Prime eligible
- Only 80 reviews so far
- Plastic lids rather than metal
The Dwbligt Fermentation Jars offer an affordable entry point into glass vessel fermentation without sacrificing quality. This two-pack of half-gallon glass jars comes with three reusable airlocks and built-in measurement markings, giving you everything you need to start fermenting natto, kimchi, sauerkraut, or kombucha. With an 85% five-star rate and a 4.8-star average across 80 reviews, customer satisfaction is strong despite this being a newer product.
Each jar holds 64 ounces, which is roughly 1.9 liters. That is enough capacity for a substantial batch of natto that will last a week or more of daily consumption. The wide 4.3-inch mouth opening makes it easy to add beans, stir in starter culture, and clean the jar thoroughly between batches. The built-in scale markings in both milliliters and fluid ounces let you track your batch size precisely.
The airtight silicone gasket seal is what makes these jars suitable for fermentation. The seal prevents oxygen from entering once the lid is screwed down, while the included airlocks allow fermentation gases to escape safely. This combination creates the controlled environment that Bacillus subtilis natto needs to thrive.
Glass Quality and Measurement Markings
The glass used in these jars is food-grade, BPA-free, and lead-free. It is thick enough to withstand the temperature changes involved in fermentation without cracking, and the dishwasher-safe designation makes cleanup straightforward. Glass is the preferred material for natto fermentation because it does not absorb the strong ammonia odor that develops during active bacterial growth.
The built-in measurement markings are a feature I did not know I needed until I had them. Being able to see exactly how much bean mass you have loaded into the jar helps you calculate the correct amount of starter to add. The dual scale in milliliters and fluid ounces accommodates both metric and imperial recipe references, which is useful since many natto resources use Japanese metric measurements.
The 4.3-inch wide mouth is generous enough to reach your hand inside for cleaning and packing. Narrow-mouth jars are notoriously difficult to clean after natto fermentation because the sticky residue clings to the glass. The wide opening on these Dwbligt jars eliminates that frustration entirely.
Airlock and Seal Performance
The three included reusable airlocks use a water-seal design that lets carbon dioxide bubble out while preventing oxygen from flowing back in. This is the traditional fermentation airlock approach, and it works reliably for natto as long as you keep the water level topped up during long fermentation cycles. The airlocks are reusable and dishwasher safe.
The silicone gasket in the lid creates an airtight seal when the jar is closed, which is what allows the airlock to function correctly. Without a proper seal, oxygen would leak in around the lid threads and the airlock would be ineffective. The Dwbligt gaskets are designed to maintain their seal over many uses, and they do not need replacement between batches.
One thing to note is that the lids are plastic rather than metal. Some fermenters prefer metal lids for durability, but the plastic lids on these jars are food-grade and BPA-free. They will not react with the acidic or alkaline environments created during fermentation, and they resist the corrosion that can affect metal lids over time.
Value and Versatility
Getting two half-gallon jars with three airlocks at this price point is an excellent value. You can run two fermentation batches simultaneously or stagger them for continuous production. The jars also work for dry storage, meal prep, and non-fermentation kitchen tasks when you are not actively making natto.
The one downside is that these jars are not Prime eligible, which means shipping may take longer than Prime-eligible alternatives. If you need jars quickly for an imminent batch, this is worth considering. However, for planned purchases, the quality and value make the wait worthwhile.
For natto makers who already have a temperature-controlled environment sorted, these jars provide everything else you need at a fraction of the cost of a dedicated fermentation kit. Pair them with a starter culture and a yogurt maker or proofing box, and you have a complete natto making setup for very little investment.
What to Look for in a Natto Making Kit
Choosing the right natto making setup depends on your experience level, budget, and how much automation you want. The products on this list fall into three categories: starter cultures, fermentation machines, and fermentation vessels. Most natto makers end up using a combination of these, pairing a starter culture with either a machine or a vessel plus heat source. Here are the key factors our team evaluates when recommending natto equipment.
Starter Culture Quality and CFU Count
The starter culture is the single most important component of your natto setup. Without viable Bacillus subtilis natto spores, you simply cannot make natto. Look for starters that publish their CFU count, as this tells you the concentration of viable bacteria per gram of powder. Kawashimaya leads with 1×10^10 CFU per gram, which is professional-grade potency.
Authenticity also matters. Japanese-sourced starters like Nattomoto have a track record of producing the characteristic texture and flavor that defines real natto. Generic Bacillus subtilis products may technically ferment soybeans but often produce a result that lacks the signature stringiness and depth of flavor. When in doubt, choose a starter with Japanese origin and strong customer reviews.
Yield per package is another critical metric. A 3-gram pouch that produces 30 kilograms of natto is far more economical than one that produces only a few cups. Calculate your expected cost per batch by dividing the starter cost by the total yield, and compare this across products to find the best value.
Temperature Control Precision
Natto fermentation requires holding soybeans at 38 to 42 degrees Celsius for 18 to 24 hours. This is the non-negotiable technical requirement that makes or breaks your batch. If the temperature drops below 35 degrees, fermentation stalls. If it rises above 45 degrees, the bacteria die and the batch fails. This narrow window is why so many beginners struggle with improvised methods.
Dedicated fermentation machines like the FermentPro and TANICA YOGURTiA solve this problem with precision thermostatic control. The FermentPro offers five-degree increments with active post-fermentation cooling, while the TANICA goes further with single-degree precision. For makers who want repeatable, consistent results without babysitting a thermometer, a machine is the answer.
Budget alternatives like the DiDimo yogurt maker provide constant temperature fermentation at a lower price point, though with less precision. If you go this route, verify that the machine can hold a temperature in the 100 to 108 degree Fahrenheit range, since some yogurt makers only operate at higher temperatures suited to dairy fermentation.
Batch Size and Yield Requirements
Consider how much natto you plan to eat per week. A single person eating a standard 50-gram daily portion consumes about 350 grams per week, which fits easily in a 1-liter fermentation vessel. Families or dedicated natto enthusiasts may want larger capacity, and the FermentPro’s 12.8-liter chamber accommodates multiple jars for parallel batch production.
The Masontops mason jar system and Dwbligt half-gallon jars both offer modular capacity. You can scale up simply by adding more jars to your rotation, which is more flexible than a single-bowl machine with fixed capacity. This scalability is one reason why vessel-based approaches remain popular alongside dedicated machines.
Multi-Function Versatility
If you are new to fermentation, a multi-function device reduces the risk of your purchase. The DiDimo 4-in-1 handles yogurt, cheese, and rice wine alongside natto. The FermentPro covers yogurt, kombucha, kimchi, tempeh, and sourdough. Even if natto does not become your primary fermentation focus, these machines remain useful for other cultured foods.
The Masontops and Dwbligt jar systems are similarly versatile, working for any lacto-fermented vegetable or beverage. This versatility means your equipment investment pays dividends across your entire fermentation practice, not just natto.
Storage and Shelf Life Management
Natto starter spores are living organisms that require proper storage to maintain viability. All the starters on this list need refrigeration, and most maintain potency for six months or longer when kept cold. Cultures For Health specifically rates their packets for six-plus months refrigerated storage, and Nattomoto spores can last a year or more under ideal conditions.
Finished natto keeps for about one week in the refrigerator. For longer storage, freezing is an excellent option. Frozen natto retains its nattokinase enzyme activity, which means the cardiovascular health benefits survive the freezing process. Many makers freeze portion-sized containers and thaw them as needed, which is a practical strategy for weekly batch prep.
Odor Management Strategies
The strong ammonia smell of active natto fermentation is one of the most common concerns raised in fermentation forums. The smell is a natural byproduct of Bacillus subtilis breaking down amino acids, and it mellows significantly after the natto is refrigerated. However, during the 18 to 24 hours of active fermentation, the odor can be intense.
Airlock-equipped jars like the Masontops and Dwbligt options help contain and vent the gases in a controlled manner. Fermentation machines with sealed chambers, like the FermentPro, also minimize odor spread. If you are fermenting in an apartment or shared living space, consider placing your setup near a window or in a room with good ventilation during the active cycle.
Some makers report that adding a small amount of sugar to the beans before fermentation reduces ammonia production without affecting the final texture. This is a technique worth experimenting with once you have mastered the basic process and want to fine-tune the aroma profile of your natto.
How to Make Natto at Home: Step-by-Step Guide
Now that you have chosen your equipment and starter, here is the step-by-step process for making natto at home. This method works with any of the kits and starters on this list. The entire process takes about 24 to 30 hours from start to finish, with most of that time being hands-off fermentation.
Step 1: Soak the soybeans. Rinse your soybeans and soak them in water for 12 to 18 hours, or overnight. The beans should roughly double in size. Small soybean varieties produce better results than large ones because they have a higher surface-area-to-volume ratio, which allows the bacteria to colonize more effectively.
Step 2: Cook the soybeans. Boil or pressure-cook the soaked beans until they are soft enough to crush between your thumb and pinky finger. This typically takes 3 to 4 hours of boiling or 45 minutes in a pressure cooker. The beans must be fully cooked but not mushy, as overcooked beans produce a paste rather than individual fermented beans.
3: Thermal shock the beans. While still hot, transfer the beans to your sterilized fermentation vessel. The residual heat should briefly raise the temperature to around 80 degrees Celsius, which kills any competing bacteria. Then allow the beans to cool to approximately 40 degrees Celsius before adding your starter.
Step 4: Add the starter culture. Sprinkle your natto starter spores over the cooled beans and mix thoroughly to ensure even distribution. Use the measuring spoon included with your starter to portion correctly. A general rule is 0.1 grams of starter per kilogram of cooked soybeans, but follow the specific instructions that come with your product.
Step 5: Ferment at 40 degrees Celsius for 18 to 24 hours. Place the inoculated beans in your fermentation machine or temperature-controlled environment. Maintain 38 to 42 degrees Celsius consistently throughout the fermentation period. After about 12 hours, you should begin to see the characteristic stringy threads forming when you lift a bean.
Step 6: Rest in the refrigerator. After fermentation completes, transfer the natto to the refrigerator for at least 12 hours before eating. This resting period allows the flavor to develop and the ammonia aroma to mellow. The texture also firms up during chilling. Properly refrigerated natto keeps for about one week, or it can be frozen for months.
FAQs
Which brand of natto is the best?
For homemade natto, Nattomoto and Kawashimaya are the two most recommended starter brands. Nattomoto offers authentic Japanese origin with a 30kg yield per bottle, while Kawashimaya provides higher CFU potency at 1×10^10 per gram and includes email plus video support. Both produce reliable, stringy natto with the characteristic neba neba texture. For store-bought natto, Japanese brands like Azuma and Yama no Kaze are widely considered premium choices.
Is it okay to eat natto every day?
Yes, eating natto daily is generally safe and even recommended for its health benefits. Natto is rich in vitamin K2, nattokinase, probiotics, and complete protein. The traditional Okinawan diet includes daily natto consumption. However, if you take blood-thinning medication, consult your doctor first because nattokinase may interact with anticoagulants. A standard portion is 50 to 100 grams per day.
Can you make natto from store-bought natto?
Yes, you can use store-bought natto as a starter through a process called backslopping. Mix a small amount of fresh commercial natto into your cooked soybeans and ferment at 40 degrees Celsius for 20 to 24 hours. However, results are less reliable than using dedicated starter spores because commercial natto may contain reduced bacterial activity after packaging and refrigeration.
Does frozen natto still have nattokinase?
Yes, freezing preserves nattokinase enzyme activity. Studies show that frozen natto retains its cardiovascular-supporting enzyme content, making it a practical option for batch storage. Thaw frozen natto in the refrigerator overnight for best texture. The stringy texture may be slightly reduced after freezing and thawing, but the nutritional benefits remain intact.
What are some common mistakes when making natto?
The most common mistakes include: letting the temperature drop below 35 degrees Celsius during fermentation, adding starter to beans that are too hot or too cold, using insufficiently cooked soybeans, failing to sterilize equipment, and over-fermenting beyond 24 hours. Temperature inconsistency is the number one cause of failed batches, followed closely by improper bean preparation.
What beans are best for making natto?
Small organic soybeans produce the best natto because their high surface area allows thorough bacterial colonization. Look for small-seed soybean varieties rather than large edamame-type beans. Non-GMO organic soybeans are preferred for both health and fermentation quality. Alternatively, Cultures For Health starter works with black beans, garbanzo beans, and adzuki beans for experimental variations.
Final Thoughts on the Best Natto Making Kits
Making natto at home is one of the most rewarding fermentation projects you can undertake, and the right equipment makes all the difference between a frustrating experience and a consistent, delicious result. The best natto making kits in 2026 span a wide range of approaches, and your ideal choice depends on where you fall on the experience spectrum.
If you want the most authentic, highest-yield starter available, go with the Nattomoto Japanese Starter Spores. If budget is your priority and you want strong support for your first batch, Kawashimaya delivers excellent value with its money-back guarantee and video tutorials. For serious makers who want precision temperature control and multi-function capability, the FermentPro Smart Fermenter is the premium choice that eliminates the guesswork from fermentation.
Whichever kit you choose, remember that natto making rewards patience and consistency. Your first batch might not be perfect, but by the second or third attempt, you will have dialed in the process and be producing fresh, probiotic-rich natto that rivals anything you can buy at the store, at a fraction of the cost. Pick your starter, set up your temperature control, and start fermenting.