Is whetstone profitable to sell on Amazon United States?

The niche generates $2.7M/yr across 21 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -3.5%. Flapen's verdict: Worth a look (57/100).

How competitive is the whetstone niche?

16 brands and 54 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 73% of demand.

What do buyers complain about in whetstone?

Top complaints mined from reviews: Quality-Overall, Sharpness, Ease Of Use. The return rate is 1.1%.

When does demand for whetstone peak?

Demand peaks in Dec; the busiest month runs 1.8× the quietest.

What does it cost to enter the whetstone niche?

Listings span $6.06–$66.98; the average listing price is $21.70 (sweet spot $15–$100). The average incumbent carries 3,747 reviews — the moat a new listing must climb.

whetstone

Worth a look

Shows a $2.7M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size

Incredible$2.7M

$2.7M/yr · 2.0M searches

Returns

Great1.1%

return rate — above 5% kills the launch gate

Avg price

Great$21.70

avg listing price — sweet spot $15–$100

Price range

Great$6.06–$66.98

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

Conversion

Good6.0%

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

Brand share

Good73%

top-5 brand share — brands hold most of the demand

Competition

Okay67%

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

Review moat

Okay3,746.62

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-3.5%

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

According to Flapen's Amazon United States niche tracking, whetstone is a $2.7M/yr Amazon United States market (2.0M searches/yr). The top 5 brands hold 73% of demand. Demand peaks in Dec. Verdict: Worth a look — 57/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

whetstone market data

Units sold / yr: 100K–125K; avg 5,000–6,000/product
Revenue / yr: $2.2M–$2.7M; units × avg price
Conversion rate: 6.0%
Avg BSR: #46
Page quality: 0%
Prime: 100%
Sponsored: 86%
Out of stock: 0.0%
Avg brand age: 56 months
Avg seller age: 165 days

Competition & brand share

The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 falling

Sellers

Top-5 brand share

73%

Top 20: 100%

Top-5 click share

67%

Top 20: 99%

Open market

23%

KEENBEST20%
Intelitopia20%
Sharp Pebble17%
HMPLL11%
Amazon Basics5%
BABOSTOW5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -3.5% search growth over the last 90 days.

Peak months: Dec · busiest ÷ quietest = 1.8×

Open Trend

Top whetstone search terms

sharpening stone412K/yr -1.8%4.3% conv.
whetstone285K/yr +9.2%6.4% conv.
knife sharpener stone212K/yr +25.2%4.9% conv.
knife sharpening stone225K/yr -25.9%5.2% conv.
sharpening stones for knives159K/yr -12.2%5.2% conv.
whetstones for knife sharpening48K/yr +144.4%7.0% conv.
wet stones for sharpening knives61K/yr +31.8%6.8% conv.
piedra para afilar cuchillos104K/yr -15.7%3.6% conv.
sharpening stones94K/yr -11.3%1.9% conv.
wet stone53K/yr +4.7%5.6% conv.

All search terms

Top whetstone 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 21 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Intelitopia Complete Knife Sharpening Stone Set Dual Grit Whetstone 400/1000 3000/8000 Knife Sharpener with Leather Strop Flattening Stone Bamboo Base 3 Non-slip Rubber Bases & Angle Guide

Intelitopia$29.644.6★7,061 rev

KEENBEST Actual Grit Premium Material Sharpening Stone 2 Side 400 1000 Whetstone Set Kitchen Knife Sharpener Stone Wet Stones for Sharping Knives Kit with Non-slip Rubber Base

KEENBEST$10.214.7★4,472 rev

Sharp Pebble Whetstone Knife Sharpener 1000/6000 Grit Sharpening Stone

Sharp Pebble$37.744.6★25,575 rev

HMPLL Knife Sharpening Stone Set Professional Whetstone 4 Side Grit 400/1000 3000/8000 Whetstone Knife Sharpener Stone Set Include Non-slip Base Leather Strop Flattening Stone & Angle Guide

HMPLL$22.724.6★3,854 rev

MIDO PROFESSIONAL ABRASIVE Knife Sharpening Stone 400/1000 Whetstone Sharpening Stone with Non-Slip Rubber Base for Kitchen Hunting and Pocket Knives or Blades

MIDO Professional Abrasive$10.114.5★2,772 rev

Newest

by launch date

BABOSTOW Premium Whetstone Knife Sharpening Stone 2 Side Grit 400/1000 Waterstone & Honing Stones - Whetstone Knife Sharpener - NonSlip Rubber Base for Kitchen Knife Sharpener Stone

BABOSTOW$9.1550 rev

5mo ago

BABOSTOW Premium Whetstone Knife Sharpening Stone 2 Side Grit 1000/6000 Waterstone- Whetstone Knife Sharpener & Hand Hones - Nonslip Bamboo Base & Angle Guide

BABOSTOW$14.24231 rev

11mo ago

Leking Professional Knife Sharpener & Sharpening Stone Set: 1000/6000 Grit Dual-Sided Whetstone(7x2.4x1.2) with Bamboo Base Non-Slip Silicone Holder Angle Guide & Leather Strop Kit

Leking$16.76136 rev

11mo ago

Ryerum Knife Sharpening Stone Whetstone 1000 Grit Knife Sharpener Enough for Daily Sharpening Stone With 2 Non-Slip Rubber Bases Safety and Easy to Use For Beginners

ryerum$6.06525 rev

1y ago

HiramWare Knife Sharpening Stone with Non-slip Rubber Base 400/1000 Grit Premium Whetstone Double-Sided Knife Sharpener for Kitchen Waterstone for Honing Blades Manually

HiramWare$9.651,027 rev

2y ago

What buyers say about whetstone

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

What buyers love

Sharpness24%

“Sharp knives”

Quality-Overall21%

“Very nice quality stones”

Value For Money14%

“Great buy”

Ease Of Use8%

“Easy to use”

Advertised Vs Actual Product8%

“Just as advertised”

Efficiency5%

“Performance wise, it does a good job”

Instructions/User Manual/Troubleshooting3%

“The instructions were good”

Precision Of Cut2%

“cut much more cleanly”

Durability2%

“Very durable”

Material Quality2%

“Great material and size”

What buyers complain about

Quality-Overall18%

“Not great quality”

Sharpness9%

“You cant get it razor sharp”

Ease Of Use7%

“I struggled with it”

Value For Money6%

“way over priced”

Instructions/User Manual/Troubleshooting6%

“Followed the rather weak instructions exactly”

Durability5%

“May need a breaking in phase”

Material Quality5%

“the bonder or base material is significantly weaker/more porous”

Size-Overall4%

“Larger than expected”

Functionality-Overall3%

“The angle guide dose not work well”

Advertised Vs Actual Product2%

“Does not come with advertised items”

Top return reasons

Sharpness33%

Size-Overall14%

Functionality-Overall11%

Advertised Vs Actual Product9%

Quality-Overall6%

Value For Money5%

Defective Material/Parts3%

Ease Of Use3%

Material Quality3%

Product Condition2%

Common questions

Is whetstone profitable to sell on Amazon United States?: The niche generates $2.7M/yr across 21 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -3.5%. Flapen's verdict: Worth a look (57/100).
How competitive is the whetstone niche?: 16 brands and 54 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 73% of demand.
What do buyers complain about in whetstone?: Top complaints mined from reviews: Quality-Overall, Sharpness, Ease Of Use. The return rate is 1.1%.
When does demand for whetstone peak?: Demand peaks in Dec; the busiest month runs 1.8× the quietest.
What does it cost to enter the whetstone niche?: Listings span $6.06–$66.98; the average listing price is $21.70 (sweet spot $15–$100). The average incumbent carries 3,747 reviews — the moat a new listing must climb.