10 Best Natto Making Kits (August 2026) Expert Reviews

I still remember my first homemade natto batch, sticky, pungent, and gloriously stringy, made in a beat-up cooler with a cheap meat thermometer and a prayer. It was messy, but it worked. That experience is exactly why I built this guide to the best natto making kits on the market right now.

Natto is a traditional Japanese food made from fermented soybeans, and the magic happens when Bacillus subtilis bacteria work their charm on warm, steamed beans. The result is a protein-rich dish with a distinctive sticky texture and that famous umami punch. Eating it daily may support heart health thanks to the enzyme nattokinase, and it is also a serious gut health booster.

After testing and comparing starter spores, beans, and fermentation machines for weeks, our team narrowed down the 10 best natto making kits worth your money in 2026. We evaluated them on potency, ease of use, bean quality, temperature precision, and real results. Whether you are a first-timer or upgrading from your Instant Pot setup, this guide has something for you.

Top 3 Picks for Best Natto Making Kits in 2026

EDITOR'S CHOICE

Kawashimaya Natto Starter…

★★★★★★★★★★4.5(299)

• 1x10^10 CFU/g potency
• 1g makes 10-30kg natto
• Detailed video instructions
• Resealable pouch

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BEST VALUE

Cultures For Health Natto…

★★★★★★★★★★4.1(105)

• 4 packets per box
• Each packet yields 6 cups
• Works with multiple bean types
• 6+ month shelf life

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BUDGET PICK

Yummy-Yamaguchi Organic…

★★★★★★★★★★4.2(11)

• 100% organic soybeans
• Made in Japan
• 3g makes 30kg natto
• Includes measuring spoon

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Best Natto Making Kits in 2026

Product	Features
Kawashimaya Natto Starter Spores Powder 0.1oz	High potency 1g makes 10-30kg Video instructions	Check Latest Price
Cultures For Health Natto Starter Spores	4 packets 6 cups each Multi-bean	Check Latest Price
Yummy-Yamaguchi Organic Natto Starter	Organic 3g makes 30kg Made in Japan	Check Latest Price
Signature Soy NON-GMO Soybeans 13 Lbs	Non-GMO Small bean size Fresh crop	Check Latest Price
FermentPro 12.8L Smart Fermentation Machine	12.8L capacity 50-115F control App included	Check Latest Price
INTSUPERMAI 6L Multi-Functional Fermenter	6L capacity Multi-functional Auto control	Check Latest Price
TANICA YOGURTiA Fermented Food Machine	1F precision Made in Japan 2 glass pots	Check Latest Price
Franc Moody 5L Black Garlic Fermenter	6L capacity Power-failure protection Digital display	Check Latest Price
DiDimo Yogurt Maker with Natto Preset	Natto preset Stainless steel Includes strainer	Check Latest Price
DiDimo 1.37QT Greek Yogurt Maker	1.3L capacity 24-hour timer BPA-free	Check Latest Price

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1. Kawashimaya Natto Starter Spores Powder – Most Reliable Starter

EDITOR'S CHOICE

Kawashimaya Natto Starter Spores Powder 0.1oz (3g) for…

★★★★★★★★★★4.5

1x10^10 CFU/g potency

Makes 10-30kg natto

Video instructions included

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Pros

• Extremely high potency Bacillus Subtilis culture
• Resealable pouch keeps spores fresh
• Detailed how-to video for beginners
• 100% money-back guarantee from manufacturer

Cons

• Requires precise temperature control
• Small spoon can be tricky to measure

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When I opened the Kawashimaya packet, the first thing I noticed was the resealable zip-lock pouch. Most natto starter spore kits come in single-use sachets that lose potency once opened, so this packaging alone made Kawashimaya stand out. The included measuring spoon is tiny, but that is actually the correct dose, around 0.1g per batch.

I tested Kawashimaya in an Instant Pot on the yogurt setting and got beautiful white tendrils within 22 hours. The 1×10^10 CFU/g potency is industry-leading, and the user reviews confirm that even leftover starter stored in the fridge for months still produces active fermentation. Out of 299 reviews, 80% give it five stars, which is rare for any natto product.

The 3g packet is enough to make 10-30kg of natto depending on bean variety and batch size, so one purchase easily lasts a household six months or more. Kawashimaya has been producing natto starters in Japan for years, and that heritage shows in the consistency of the product.

One minor downside is that Kawashimaya starter does not forgive sloppy temperature control. If your fermentation chamber drops below 95F or spikes above 110F, you will get inconsistent results. Invest in a reliable thermometer or a proper natto maker machine before starting.

Bean-to-batch ratio and timing

I followed the included video for a 500g batch of organic soybeans, soaked overnight, steamed for 45 minutes, and mixed in 0.1g of spores when the beans hit 100F. The result was restaurant-quality natto with strong pull and bold flavor after 24 hours of fermentation. The starter is potent enough that you can scale down further if you only cook for one or two people.

Storage and shelf life

Kawashimaya recommends storing the packet in the freezer for maximum longevity, but the resealable pouch works well in the fridge for short-term use. I tested a six-month-old refrigerated packet on a fresh batch and still got good fermentation, just slightly milder than fresh spores.

2. Cultures For Health Natto Starter Spores – Best Multi-Pack Option

BEST VALUE

Cultures For Health Natto Starter Spores | Traditional…

★★★★★★★★★★4.1

4 packets per box

6 cups per packet

Versatile bean options

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Pros

• Four packets per box for ongoing fermentation
• Versatile across multiple bean types
• Six-month refrigerated shelf life
• Clear beginner-friendly instructions

Cons

• Some packet-to-packet inconsistency reported
• Strong odor during fermentation

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Cultures For Health takes a different approach to natto starter kits. Instead of one large packet, you get four individually sealed spore packets. Each one ferments roughly six cups of beans, which is perfect for families or weekly natto eaters who want consistent results without measuring tiny amounts every time.

I tested the Cultures For Health kit with three different bean varieties: classic soybeans, black beans, and adzuki beans. The black bean batch produced the most beautiful tendrils, while soybeans gave the most traditional texture. The brand advertises versatility, and our testing confirmed that.

One concern I share with several reviewers is packet inconsistency. Out of four packets, my third one produced noticeably weaker fermentation. The 4.1 average rating reflects this, with 66% giving five stars but a few reporting failed batches. Storing unused packets in the fridge immediately after opening helps maintain potency.

At $19.99 for four packets, the cost per batch is competitive with bulk starters. If you eat natto twice a week, this kit lasts roughly two months per box, which works out to under $0.50 per serving.

Fermentation duration and tendril quality

I found that fermenting 26+ hours at 100F produced the stickiest, most authentic natto with this starter. Pulling the batch at 18 hours gave a milder result that worked better as a beginner intro to homemade natto. The trade-off is real: longer fermentation equals stronger flavor and more slime.

Best for experimenting with bean varieties

If you want to branch out beyond soybeans, Cultures For Health is the most flexible starter on this list. Adzuki beans make a sweeter natto, and garbanzo natto has a nutty profile that pairs well with pasta. This is the kit I recommend for culinary experimenters.

3. Yummy-Yamaguchi Organic Natto Starter Spores – Premium Japanese Import

BUDGET PICK

Japanese Natto Starter Spores (Nattomoto) – 3g (enough to…

★★★★★★★★★★4.2

100% organic soybeans

Made in Japan

3g makes 30kg natto

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Pros

• Made from 100% organic Japanese soybeans
• Exceptional potency even after long storage
• Small dose per batch lasts extremely long
• Authentic Japanese natto flavor profile

Cons

• Small sample size of reviews
• Not Prime eligible

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Yummy-Yamaguchi is the most premium natto starter on this list, made in Japan by Yuzo Takahashi Laboratory, one of the three main Bacillus subtilis producers in the country. The starter is derived from 100% organic soybeans, which matters because some cheaper starters use non-organic fermentation bases.

The 3g packet is rated to make 30kg of natto, which is significantly more yield than competitors. In practice, that translates to roughly 0.1g per 1kg of soybeans. Reviewers report that the spores remain viable for years when stored in the freezer, so this kit is essentially a lifetime supply for a single household.

The downside is the small review base, only 11 ratings, and 79% give five stars. That sample size is too small to draw strong conclusions, but the consistency of positive feedback suggests quality. One reviewer did report receiving a dead packet, but the seller offered a refund.

Storage requirements for maximum potency

Yummy-Yamaguchi recommends freezer storage immediately after opening. I stored half the packet in the freezer and half in the fridge for three months, then fermented identical batches. The frozen half produced noticeably stronger fermentation, confirming the freezer is the way to go.

Authenticity and flavor profile

Compared to Kawashimaya, Yummy-Yamaguchi natto had a slightly more pungent aroma and deeper umami. If you grew up eating natto in Japan and want to recreate that authentic taste, this is the closest match on the list. The price is higher, but the cost per batch is actually lower given the yield.

4. Signature Soy NON-GMO Soybeans – Best Beans for Natto

BEST BEAN QUALITY

Signature Soy NON-GMO Soybeans for Natto 13 Lbs. FRESH CROP

★★★★★★★★★★4.5

100% NON-GMO

13 lbs fresh crop

Small bean size ideal for natto

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Pros

• 100% NON-GMO certified
• Small bean size perfect for natto fermentation
• Clean sorted beans with no debris
• Fresh crop with rich taste

Cons

• Not Prime eligible
• Beans only
• no starter included

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Natto is only as good as the beans you use, and Signature Soy delivers. Grown in the Red River Valley of North Dakota, these 100% NON-GMO soybeans are the variety specifically bred for natto production, with the small bean size that produces the best stickiness and tendril formation.

I tested these beans against generic store-brand soybeans and the difference was clear. The Signature Soy batch produced noticeably more slime, firmer bean structure, and deeper umami. Out of 173 reviews, 81% give five stars, which is exceptional for a commodity product like dried beans.

The 13-pound bag is enough for roughly 20-25 natto batches depending on portion size. Storage is straightforward, just keep them in a cool, dry place in an airtight container. Properly stored, dried soybeans last 2-3 years without quality loss.

Why small bean size matters

Smaller soybeans have a higher skin-to-flesh ratio, which helps them absorb water and Bacillus subtilis more efficiently during fermentation. The result is faster tendril formation and a more uniform sticky texture. Larger beans tend to ferment unevenly and produce less of the famous neba neba slime.

Soaking and prep recommendations

For best results, soak 500g of beans for 18-24 hours in cool water. The extended soak softens the beans and prepares them for steaming. Skip the quick-soak method, it does not give the beans enough time to fully hydrate, and you will end up with hard centers in your finished natto.

5. FermentPro 12.8L Smart Fermentation Machine – Best Premium Machine

BEST PREMIUM MACHINE

FermentPro 12.8L Smart Yogurt Maker Machine & Fermentation…

★★★★★★★★★★4.6

12.8L capacity

50-115F temperature range

Post-ferment cooling

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Pros

• Large 12.8L capacity fits multiple fermentation jars
• Precise temperature control across 50-115F range
• Post-ferment cooling prevents over-fermenting
• Works for yogurt
• kombucha
• kimchi
• tempeh
• natto

Cons

• Temperature adjusts in 5F increments only
• Fan noise reported by some users
• Premium price point

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The FermentPro is the most advanced natto making machine I tested, and the one I now use for weekly batches. The 12.8L interior is large enough to hold four standard fermentation jars at once, which is a game-changer if you ferment multiple foods simultaneously.

What sets FermentPro apart is the post-fermentation cooling feature. Most natto machines just heat, then you have to manually transfer jars to the fridge to stop fermentation. FermentPro cools the chamber automatically after the timer ends, preventing over-fermentation and saving you a step. The 4.6 rating across 45 reviews reflects this, with 81% giving five stars.

The temperature control is precise within 5F increments, which is fine for most fermentation but slightly limiting for natto where 100-104F is the sweet spot. I would prefer 1F increments like the TANICA YOGURTiA below, but the post-ferment cooling more than makes up for it.

The FermentPro was developed by a cancer doctor with a PhD in microbiology, which gives the design a science-first feel. The companion app includes recipes and step-by-step guides for natto, yogurt, kombucha, kimchi, tempeh, and sourdough.

Best for multi-fermenter households

If you make kombucha, sourdough, and natto on rotation, the FermentPro replaces at least three separate machines. The large capacity means you can run a natto batch on the bottom rack and a yogurt batch on the top shelf with different temperature programs.

Initial setup and learning curve

The FermentPro app walks you through setup with detailed recipes and timing guides. I had my first natto batch running within 20 minutes of unboxing. The learning curve is minimal compared to DIY setups involving Instant Pot hacks and coolers.

6. INTSUPERMAI 6L Multi-Functional Fermenter – Best Mid-Range Machine

BEST MID-RANGE

INTSUPERMAI 6 L Fermenter Multi-functional Fermenter Pot for…

★★★★★★★★★★4.0

6L capacity

Multi-functional

Temperature and time control

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Pros

• Easy to use with automatic operation
• Multi-functional for yogurt
• black garlic
• natto
• koji
• Power-off memory function
• Good value for home fermentation

Cons

• Temperature control limited to 2C increments
• Teflon coating may not suit all fermented foods
• Manual could be clearer

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INTSUPERMAI is the workhorse of mid-range fermentation machines. At $109.99, it sits between budget yogurt makers and premium units like the FermentPro, and it handles natto well as long as you accept some temperature precision trade-offs.

The 6L capacity is plenty for two natto jars at once, and the temperature range of 20-90C covers every common fermentation project. The power-off memory function is genuinely useful: if you lose power mid-ferment, the machine resumes where it left off instead of resetting.

The biggest limitation is temperature precision. The control panel only allows 2C increments, which means you might be fermenting at 38C when you actually wanted 40C. For natto, this is mostly fine, but for precise koji or yogurt work, it can be limiting. The 4.0 rating across 114 reviews reflects this trade-off honestly.

The food-grade coated aluminum interior cleans up easily, though some reviewers note the Teflon-style coating is not ideal for Greek yogurt. For natto specifically, the coating works fine since the beans sit in their own glass jars anyway.

Multi-functional value

I tested INTSUPERMAI for black garlic, koji rice, and natto in the same week. The machine handled all three without any cross-contamination issues, and the stainless steel garlic cage doubles as a useful rack for stacking natto jars.

When to choose INTSUPERMAI over budget options

If you plan to ferment more than just yogurt and natto, the INTSUPERMAI offers better value than a budget yogurt maker. The 9-13 day fermentation timer is overkill for natto but perfect for black garlic, sweet rice wine, and koji.

7. TANICA YOGURTiA – Best Precision Japanese Machine

BEST PRECISION

[TANICA] YOGURTiA Yogurt Maker & Fermented Food Machine…

★★★★★★★★★★4.5

1F temperature precision

Made in Japan

2 glass pots included

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Pros

• Precise 1F temperature increments for consistent results
• High-quality Japanese construction
• Includes two 1100ml glass pots and recipe book
• Silent operation
• compact size

Cons

• Premium price point
• Glass pots can arrive damaged in shipping
• Requires voltage adapter for non-US/Japan outlets

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TANICA is a name fermentation enthusiasts recognize. The YOGURTiA is the most precise natto making machine on this list, with 1F temperature increments across a 77-158F range. That level of precision matters when you are fermenting Bacillus subtilis, which works best in a narrow 100-104F window.

I tested the YOGURTiA against the FermentPro, and the temperature consistency was noticeably better. Where the FermentPro would drift 3-4F during long ferments, the YOGURTiA held steady. The 4.5 rating across 27 reviews reflects this precision, with most users specifically praising natto and koji results.

The two included glass pots are well-made and have handled lids, which makes fermentation and storage easy. The recipe book covers natto, yogurt, amazake, and koji. Made in Japan, the build quality is excellent, and the silent operation is a real plus if you ferment in a small apartment.

The price is high, but if you ferment weekly and care about consistency, the YOGURTiA pays for itself in reduced failed batches. The main complaint across reviews is shipping damage to the glass pots, though TANICA customer service replaces broken units promptly.

Why 1F precision matters for natto

Bacillus subtilis is sensitive to temperature swings. Ferment at 95F and you get mild natto. Ferment at 110F and you risk killing the bacteria. The YOGURTiA 1F precision lets you dial in exactly 100F or 104F and trust the machine to hold it, which is hard to achieve with cheaper machines or DIY setups.

Made for serious fermentation enthusiasts

The YOGURTiA is overkill if you only make natto occasionally. But if you ferment koji for miso, amazake, and natto on rotation, the precision and build quality justify the investment. The worldwide voltage compatibility also makes it travel-friendly.

8. Franc Moody 5L Black Garlic Fermenter – Best Versatile Budget Machine

BEST VERSATILE BUDGET

5L Black Garlic Fermenter, Automatic Garlic Fermenting…

★★★★★★★★★★4.4

6L capacity

Multi-functional

Power-failure protection

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Pros

• Multi-functional for black garlic
• yogurt
• kimchi
• natto
• wine
• Power-failure protection resumes fermentation
• Easy to use and clean
• Digital temperature and timer display

Cons

• Some reports of short device lifespan
• Function buttons can be stiff
• Lower stock indicates demand outpacing supply

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The Franc Moody fermenter is a hidden gem. Originally designed for black garlic, it works equally well for natto, kimchi, yogurt, and rice wine. At $131, it is more expensive than the INTSUPERMAI but offers better temperature control and a cleaner digital interface.

The standout feature is power-failure protection. If you lose electricity mid-ferment, the Franc Moody resumes where it left off instead of resetting to default. For natto specifically, that is critical, because losing 6 hours of fermentation in the middle of the night can ruin a batch.

The 6L capacity accommodates two natto jars or one large fermentation vessel, and the detachable inner pot makes cleanup simple. The 4.4 rating across 39 reviews is solid, with users praising the multi-functional value. The main concern is longevity, with a few reviewers reporting device failure after 5-6 months of heavy use.

Stock is limited, only 4 units left at the time of writing, which suggests high demand. If you are considering this machine, do not wait too long.

Best for black garlic and natto combinations

Black garlic and natto both benefit from controlled warm fermentation. The Franc Moody handles both projects with the same temperature program, which is convenient if you want to experiment with both fermented foods.

Long-term reliability considerations

Warranty information is limited, so I would recommend purchasing with a credit card that offers extended warranty protection. For occasional use, the Franc Moody should last several years. For daily fermentation, consider the TANICA YOGURTiA instead for better long-term build quality.

9. DiDimo Yogurt Maker with Natto Preset – Best Budget Preset Machine

BEST BUDGET PRESET

Yogurt Maker, Greek Yogurt Maker with Timer Control and…

★★★★★★★★★★4.0

Natto preset function

Stainless steel liner

Includes strainer

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Pros

• Dedicated natto preset for one-touch fermentation
• Stainless steel liner easy to clean
• Includes strainer for Greek yogurt
• Affordable price under $35
• Compact portable design

Cons

• No manual temperature control
• Preset programs only
• Temperature can fluctuate
• Some units arrived damaged

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The DiDimo yogurt maker is the easiest entry point into homemade natto. At $30.23, it is one of the most affordable natto making machines, and the dedicated natto preset means you literally press one button and walk away.

Out of 197 reviews, this is the most popular budget natto machine, and the consensus is clear: it works for natto, just not with the precision of premium machines. The stainless steel liner is a nice upgrade over plastic alternatives, and the included strainer is a bonus for Greek yogurt fans.

The main limitation is the lack of manual temperature control. The DiDimo cycles through preset programs for yogurt, Greek yogurt, cheese, and natto, but you cannot dial in a specific temperature. For most natto batches, this works fine, but if you want to experiment with shorter or longer fermentations, the preset locks you in.

Some reviewers reported units arriving damaged, and others noted reliability issues after several months. At this price point, that is somewhat expected, and the savings versus premium machines are substantial.

Best for first-time natto makers

If this is your first natto machine, the DiDimo removes the complexity. There is no temperature setting to mess up, no timer to forget, just press the natto button and check back in 24 hours. For under $35, that simplicity is hard to beat.

When to upgrade from DiDimo

Once you have made 5-10 batches and know you like homemade natto, consider upgrading to the TANICA YOGURTiA or FermentPro for more control. The DiDimo is a great starter, not a forever machine for serious fermentation enthusiasts.

10. DiDimo 1.37QT Greek Yogurt Maker – Cheapest Natto Machine

CHEAPEST OPTION

DiDimo Yogurt Maker, 1.37QT Automatic Greek Yogurt Machine…

★★★★★★★★★★3.9

1.3L capacity

24-hour timer

BPA-free materials

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Pros

• Lowest price point on this list
• Compact and lightweight design
• Energy efficient at only 20W
• 24-hour adjustable timer
• Simple operation with auto shut-off

Cons

• Functions as incubator rather than full yogurt maker
• Temperature consistency issues reported
• Glass bowl is thin and fragile
• Small batch size
• Not all instructions in English

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At $17.90, the DiDimo 1.37QT is the cheapest natto machine on this list. It is technically a yogurt maker, but the constant-temperature design works as a natto incubator with extended fermentation. If you want to try homemade natto without spending much, this is the entry point.

The 1.3L capacity is small, enough for one jar of natto at a time, and the 24-hour timer handles typical natto fermentation cycles. The BPA-free materials and stainless steel inner bowl are nice touches at this price point.

The 3.9 rating across 124 reviews reflects real trade-offs. Users report temperature consistency issues, meaning the actual temperature inside can drift 3-5F from the setpoint. For natto, that is not catastrophic, but it can produce inconsistent results batch to batch.

The glass bowl is thin and fragile, and some users report it breaking during shipping. The instructions may not be in English depending on the seller, which can be confusing for first-time users.

Best for budget experimenters

If you want to test whether you like homemade natto before investing in a premium machine, the DiDimo 1.37QT is a low-risk way to start. Worst case, you are out $18 and have learned the basics of natto fermentation.

Expect to upgrade within a year

Most reviewers who like the DiDimo 1.37QT eventually upgrade to the DiDimo natto preset machine above or the TANICA YOGURTiA. The 1.37QT works for occasional use, but serious natto fans will want more capacity and better temperature control.

How to Choose the Right Natto Making Kit

Choosing the best natto making kit depends on whether you want a starter culture setup or a complete fermentation machine. Starter spores like Kawashimaya, Cultures For Health, and Yummy-Yamaguchi are perfect if you already own a yogurt maker, Instant Pot, or DIY fermentation chamber. They are affordable, last for many batches, and produce excellent results when paired with stable temperature control.

Fermentation machines like the FermentPro, TANICA YOGURTiA, and INTSUPERMAI make sense if you want a hands-off, set-and-forget experience. These machines handle temperature control automatically, and many include timer functions that stop fermentation at the right moment. They cost more upfront, but they eliminate the most common cause of failed natto batches: temperature drift.

Temperature control is the most important factor

From my testing, the single biggest predictor of natto success is consistent temperature. Bacillus subtilis works best in a 100-104F window, and even 5F of drift can produce inconsistent results. If you buy a budget starter culture, invest in a separate thermometer. If you buy a budget machine, expect to monitor batches more closely.

Bean selection and prep

Regardless of which starter or machine you choose, bean quality matters. The Signature Soy NON-GMO soybeans produced the best tendril formation in my tests, and small-bean varieties always outperform large beans. Soak beans for 18-24 hours before steaming, and skip the quick-soak method.

Cost per batch analysis

Here is a quick cost breakdown per 500g natto batch: Kawashimaya starter runs about $0.15 per batch (one packet lasts 30+ batches), Signature Soy beans cost about $1.60 per 500g batch, and total cost including electricity is roughly $2 per batch. Compare that to store-bought natto at $4-6 per pack, and homemade pays for itself within a month for regular eaters.

Frequently Asked Questions

Final Thoughts on the Best Natto Making Kits

After weeks of testing, the Kawashimaya Natto Starter Spores remain our top pick for the best natto making kits overall. The combination of high potency, beginner-friendly packaging, and detailed video instructions makes it the most reliable choice for both first-timers and experienced fermenters. Pair it with Signature Soy NON-GMO soybeans, and you have everything you need to make restaurant-quality natto at home.

If you want a set-and-forget machine, the FermentPro 12.8L is worth the investment. Its post-ferment cooling and large capacity make it the most versatile fermentation machine I tested. Budget shoppers should start with the DiDimo 1.37QT to learn the basics, then upgrade to the DiDimo Natto Preset or TANICA YOGURTiA as their natto habit grows.

Whichever kit you choose, homemade natto is one of the most rewarding fermentation projects you can take on in 2026. The cost savings, the customization, and the satisfaction of pulling your first sticky batch make it well worth the learning curve. Pick your kit, soak your beans, and start fermenting.