Is fermentation kit profitable to sell on Amazon United States?

The niche generates $175K/yr across 17 tracked products. 4 of 4 products launched in the last 360 days are still selling. 90-day search growth is +13.4%. Flapen's verdict: Skip it (44/100).

How competitive is the fermentation kit niche?

8 brands and 35 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 95% of demand.

What do buyers complain about in fermentation kit?

Top complaints mined from reviews: Value For Money, Ease Of Use, Size-Overall. The return rate is 1.6%.

When does demand for fermentation kit peak?

Demand peaks in Jan–Aug–Sep; the busiest month runs 2.5× the quietest.

What does it cost to enter the fermentation kit niche?

Listings span $12.84–$54.59; the average listing price is $27.78 (sweet spot $15–$100). The average incumbent carries 3,102 reviews — the moat a new listing must climb.

fermentation kit

Skip it

Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.

Avg price

Incredible$27.78

avg listing price — sweet spot $15–$100

Price range

Great$12.84–$54.59

cheapest to priciest tracked listing — scored on the share inside $15–$100

Returns

Great1.6%

return rate — above 5% kills the launch gate

Conversion

Good5.0%

search→purchase rate — share of searches ending in a sale

Growth

Okay+13.4%

90-day search growth — must beat 0% to launch

Market size

Okay$175K

$175K/yr · 125K searches

Review moat

Okay3,101.76

avg incumbent reviews — the moat a new listing must climb

Competition

Okay69%

top-5 click share — leaders hold, buyers still browse

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Brand share

Bad95%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, fermentation kit is a $175K/yr Amazon United States market (125K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Jan–Aug–Sep. Verdict: Skip it — 44/100.

Data updated Aug 5, 2026 · scored weekly · How we score niches

fermentation kit market data

Units sold / yr: 6K–8K; avg 500–750/product
Revenue / yr: $167K–$222K; units × avg price
Conversion rate: 5.0%
Avg BSR: #46
Page quality: 0%
Prime: 100%
Sponsored: 94%
Out of stock: 3.9%
Avg brand age: 41 months
Avg seller age: 153 days

Competition & brand share

The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.

Brands

8 falling

Sellers

Top-5 brand share

95%

Top 20: 100%

Top-5 click share

69%

Top 20: 100%

Open market

Masontops83%
SOLIGT4%
VSAPRDT3%
IceFun2%
ANZHIRUOSU2%
Ultimate2%
Open — no brand owns it (2 brands, 3%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +13.4% search growth over the last 90 days.

Peak months: Jan, Aug, Sep · busiest ÷ quietest = 2.5×

Open Trend

Top fermentation kit search terms

masontops23K/yr +5.3%3.5% conv.
fermenting22K/yr +20.9%1.1% conv.
masontops fermentation kit22K/yr +7.5%6.3% conv.
mason tops16K/yr +5.2%2.4% conv.
mason tops fermentation kit15K/yr +4.1%5.9% conv.
fermentation lids and weights6K/yr +80.3%2.1% conv.
masontops complete fermentation kit3K/yr +27.7%7.7% conv.
fermentation kit wide mouth5K/yr +24.7%3.5% conv.
ball fermentation kit5K/yr +41.5%2.4% conv.
mason fermentation kit4K/yr +1.6%5.9% conv.

All search terms

Top fermentation kit products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 17 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Masontops Complete Mason Jar Fermentation Kit - Pickle Kit Sauerkraut Making Kit Kimchi Container - Fermentation Airlock Lids Wide Mouth Mason Jars

Masontops$54.594.8★4,768 rev

Masontops Complete Mason Jar Fermentation Kit - Easy Small/Regular Mouth Jars Vegetable Fermenting Set - DIY Equipment Essentials

Masontops$49.084.7★744 rev

Masontops Pickle Pipes - Airlock Fermentation Lids - Fermentation Kit For Wide Mouth Mason Jar Sauerkraut & Pickle Kit - Fermentation Jar Not Included

Masontops$23.884.7★4,701 rev

Masontops Fermentation Jar Starter Set Easy Vegetable Fermentation Kit Includes Mason Jar Pickle Kit with Fermentation Lids & Fermentation Weight

Masontops$26.784.6★517 rev

Masontops Pickle Pipes - Airlock Fermentation Lids - Fermentation Kit for Small Mouth Mason Jar Sauerkraut & Pickle Kit Fermentation Jar not Included

Masontops$21.244.7★4,701 rev

Newest

by launch date

Ultimate Fermentation Kit to Make Probiotic Vegetables: Sauerkraut Kimchi Pickles w/FREE Digital Guide 3 Fermenting Springs & Venting Lids for Easy Pickling in Wide Mouth Mason Jars (Not Included)

Ultimate$22.0365 rev

3mo ago

Fermenting weights wide mouth Mason Jar Fermentation Kit with 4 Fermentation Lids 4 Glass fermentation Weights 4 Airlocks for Fermenting 5 Silicone Rings & Grommets - Pickling kitNo Jars

ANZHIRUOSU$15.7442 rev

7mo ago

4-Pack Mason Jar Fermentation Kit With Four 32 Oz Jars And Plastic Lids

IceFun$37.29149 rev

8mo ago

Master Fermentation Kit for Wide Mouth Mason Jars Incl 2x Jars and Weights

The Amish Chef$51.7317 rev

8mo ago

Fermentation Kit for Wide Mouth Mason fermentation Jar for Pickling & More

VSAPRDT$25.74283 rev

1y ago

What buyers say about fermentation kit

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall18%

“Good quality, large jars”

Advertised Vs Actual Product14%

“As advertised,”

Ease Of Use13%

“Easy and fun to use”

Size-Overall11%

“Great fit”

Efficiency6%

“Functional and works well”

Ease Of Cleaning5%

“They cleanup very easily”

Value For Money4%

“Good price”

Design-Overall2%

“the design is simple”

Durability2%

“seems quite durable”

Leak-Proof2%

“Simply great don't leak”

What buyers complain about

Value For Money8%

“especially for the price”

Ease Of Use8%

“hard to take them off”

Size-Overall8%

“Way to small”

Grip7%

“No grip”

Leak-Proof5%

“It leaks”

Functionality-Overall5%

“Didnt work at all for me”

Rusts/Corrodes5%

“These lids corroded this first time I used them”

Quality-Overall4%

“Garbage”

Durability4%

“Broke after a few uses”

Instructions/User Manual/Troubleshooting2%

“no guide or instructions”

Top return reasons

Size-Overall70%

Advertised Vs Actual Product9%

Functionality-Overall5%

Value For Money5%

Ease Of Use2%

Weight Heavy1%

Handle Quality1%

Leak-Proof1%

Grip1%

Compatibility-Overall1%

Common questions

Is fermentation kit profitable to sell on Amazon United States?: The niche generates $175K/yr across 17 tracked products. 4 of 4 products launched in the last 360 days are still selling. 90-day search growth is +13.4%. Flapen's verdict: Skip it (44/100).
How competitive is the fermentation kit niche?: 8 brands and 35 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 95% of demand.
What do buyers complain about in fermentation kit?: Top complaints mined from reviews: Value For Money, Ease Of Use, Size-Overall. The return rate is 1.6%.
When does demand for fermentation kit peak?: Demand peaks in Jan–Aug–Sep; the busiest month runs 2.5× the quietest.
What does it cost to enter the fermentation kit niche?: Listings span $12.84–$54.59; the average listing price is $27.78 (sweet spot $15–$100). The average incumbent carries 3,102 reviews — the moat a new listing must climb.