whetstone
Worth a lookShows low returns (0.6%), but soft demand (-16.1% this quarter) keeps it on the watch list.
Returns
Incredible0.6%return rate — above 5% kills the launch gate
Avg price
Great£16.92avg listing price — sweet spot $15–$100
Price range
Good£3.32–£48.12cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Good6.1%search→purchase rate — share of searches ending in a sale
Market size
Good£388K£388K/yr · 373K searches
Competition
Good53%top-5 click share — leaders hold, buyers still browse
Brand share
Good73%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Okay3,042.82avg incumbent reviews — the moat a new listing must climb
Growth
Bad-16.1%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, whetstone is a £388K/yr Amazon United Kingdom market (373K searches/yr). The top 5 brands hold 73% of demand. Demand peaks in Dec. Verdict: Worth a look — 54/100.
Data updated Jul 22, 2026 · scored weekly · How we score niches
whetstone market data
- Units sold / yr
- 20K–25K
- avg 750–1,000/product
- Revenue / yr
- £338K–£423K
- units × avg price
- Conversion rate
- 6.1%
- Avg BSR
- #18
- Page quality
- 0%
- Prime
- 95%
- Sponsored
- 86%
- Out of stock
- 2.4%
- Avg brand age
- 60 months
- Avg seller age
- 179 days
Competition & brand share
The top 5 products take 53% of clicks — established leaders, but buyers still shop beyond them.Brands
18 falling
Sellers
25
Top-5 brand share
73%
Top 20: 100%
Top-5 click share
53%
Top 20: 99%
Open market
22%
- KEENBEST26%
- wucgea22%
- S SATC10%
- BGS Do it yourself9%
- SHAN ZU8%
- vuwo5%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -16.1% search growth over the last 90 days.Peak months: Dec · busiest ÷ quietest = 2.0×
Top whetstone search terms
- sharpening stone93K/yr
- whetstone76K/yr
- knife sharpener stone32K/yr
- whetstone knife sharpener32K/yr
- wet stone knife sharpener21K/yr
- knife sharpening stone21K/yr
- sharpening stones14K/yr
- sharpening stones for knives16K/yr
- wet stone11K/yr
- waterstones13K/yr
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.
All 22 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
KEENBEST Actual Grit Premium Material Sharpening Stone Set 400 1000 3000 8000 Whetstone Japanese Knife Sharpener Stone Wetstones for Sharpening Knives Wet Stone Red
KEENBEST£17.584.6★3,524 rev
Knife Sharpening Stone Kit - 1000/6000 Grit Japanese Whetstone Sharpener Set with Non-Slip Rubber Base Angle Guide Flattening Stone for Kitchen Knives Chisel Axe Scissors
wucgea£10.164.5★4,592 rev
SATC Sharpening Stones for Kitchen Knives 400 1000 3000 8000 Grit Whetstone Knife Sharpener with Non-Slip Wood Base Flattening Stone Angle Guide and Leather Strop
S SATC£15.244.4★1,666 rev
BGS Diy 8062 | Sharpening Stone | K 120/K 240
BGS Do it yourself£3.324.6★362 rev
SHAN ZU Sharpening Stone Whetstone with Angle Guide Non-Slip Bamboo Base grit 1000/6000 Knife Sharpeners Professional 2-in-1 Wetstone
SHAN ZU£16.954.6★15,661 rev
Newest
by launch date
Dayacoco Knife Sharpening Stone Kit Premium 400 1000 3000 8000 Whetstone Knife Sharpener with Non-Slip Wood Base Angle Guide Flattening Stone Leather Strop for Sharpening Knives (8 Pcs)
Dayacoco£12.1810 rev
vuwo Knife Sharpening Stone Kit- Professional Knife Sharpener Dual Sided 400&1000 Grit Wet Stone Set with Non-Slip Rubber Base Whetstone for Kitchen
vuwo£6.871,121 rev
HEZHEN Double-Side Whetstone Extra Large Corundum Sharpening Stone Kit Professional Knife Sharpener Set 1000/5000 Grit with Non-Slip Acacia Wood Base/Flattening Stone/Angle Guide
HEZHEN£48.123 rev
RISEMART Knife Sharpening Stones Set Professional 400 1000 3000 8000 Grit Whetstone for Sharpening Knives with Flattening Stone Non-Slip Base Angle Guide (8 Pcs)
RISEMART£13.65325 rev
SATC Sharpening Stones for Kitchen Knives 400 1000 3000 8000 Grit Whetstone Knife Sharpener with Non-Slip Wood Base Flattening Stone Angle Guide and Leather Strop
S SATC£15.241,666 rev
Trending
90-day click momentumDayacoco Knife Sharpening Stone Kit Premium 400 1000 3000 8000 Whetstone Knife Sharpener with Non-Slip Wood Base Angle Guide Flattening Stone Leather Strop for Sharpening Knives (8 Pcs)
Dayacoco£12.185.0★
BGS Diy 8062 | Sharpening Stone | K 120/K 240
BGS Do it yourself£3.324.6★
HEZHEN Double-Side Whetstone Extra Large Corundum Sharpening Stone Kit Professional Knife Sharpener Set 1000/5000 Grit with Non-Slip Acacia Wood Base/Flattening Stone/Angle Guide
HEZHEN£48.124.6★
IHIGOGOFA Sharpening Stone 230 mm (9) 180 Grit Oval Whetstone for Sharpening Knives Knife Sharpener Stone for Garden Tools Kitchen Knives Chisels Axes
IHIGOGOFA£5.984.2★
Knife Sharpening Stone Kit - 1000/6000 Grit Japanese Whetstone Sharpener Set with Non-Slip Rubber Base Angle Guide Flattening Stone for Kitchen Knives Chisel Axe Scissors
wucgea£10.164.5★
What buyers say about whetstone
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“Very handy item that helps with sharp knives”
“Good value for money”
“Does the job”
“Easy to use”
“Like new”
“instructions in the set”
“it does the job efficiently”
“The size is also convenient”
“aesthetically pleasing product that works well”
What buyers complain about
“low quality”
“Not fit for purpose”
“Simply does NOT sharpen at all”
“The product dimensions are misleading”
“more expensive 6000 grit stone which does not shed material”
“found this a bit too fiddly to use”
“Lasted longer”
“instructions could have been better”
“Bit messy and takes bit of time and prectice”
“poor value for money”
Top return reasons
Common questions
- Is whetstone profitable to sell on Amazon United Kingdom?
- The niche generates £388K/yr across 22 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -16.1%. Flapen's verdict: Worth a look (54/100).
- How competitive is the whetstone niche?
- 18 brands and 25 sellers compete. The top 5 products take 53% of clicks and top 5 brands hold 73% of demand.
- What do buyers complain about in whetstone?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Sharpness. The return rate is 0.6%.
- When does demand for whetstone peak?
- Demand peaks in Dec; the busiest month runs 2.0× the quietest.
- What does it cost to enter the whetstone niche?
- Listings span £3.32–£48.12; the average listing price is £16.92 (sweet spot $15–$100). The average incumbent carries 3,043 reviews — the moat a new listing must climb.