- Flapen Score
- 45 / 100Ranks 5,778 of 9,536 Tools & Home Improvement niches · −3 vs the category median of 4845
- Market size
- $794K/yr183K searches / yr
- 90-day growth
- +16.1%search demand this quarter
- Competition
- 73%top-5 click share · 2 brands · 95 sellers
Flapen Score
Naniwa against its category
The dotted line is the Tools & Home Improvement average. Past it, Naniwa is stronger. Inside it, weaker.
Market
The Naniwa market on Amazon at a glance
Shoppers on Amazon United States searched for Naniwa 183K times last year and spent an estimated $794K. All 2 brands take every click. Demand peaks in Aug–Nov–Dec. Flapen scores it 45 out of 100, a Fail.
01 · Demand
An estimated 4.4% of those searches ended in a purchase.
Shoppers searched for this 183K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 4.4% of those searches ended in a purchase. Searches in the last 90 days moved +16.1% against the 90 days before. Searches, conversion and average price together put the market at an estimated $794K a year.
- Searches, last 12 months
- 183K
- Growth, 90 days vs prior 90
- +16.1%
- Conversion, latest week
- 4.4%
- Market size, estimated
- $794Ka year
- Peak month
- December2.9× the quietest month
- Top search term
- shapton sharpening stones53K searches a year
02 · Price
A sale here is worth $98.75.
Listings sell for $98.75 on average, from $43.97 to $230.13. Amazon reports units sold in ranges. This niche sold 6K to 8K a year. The average listing sells 500 to 750 of them. At $98.75 that is $49K to $74K a year per listing.
- Average price
- $98.75inside the $15 to $100 sweet spot
- Price range
- $43.97–$230.13
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 6K–8K
- Units per listing a year
- 500–750
- Revenue per listing a year
- $49K–$74K
- Returns
- 1.1%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
62% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #219 within Sharpening Stones. It carries 2,052 reviews at 4.66 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 62%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #219in Sharpening Stones
- Average rating
- 4.66 starsAmazon United States average 4.42 stars
- Average reviews
- 2,052per listing
- Listings tracked
- 13
04 · Newcomers
1 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 70 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 70 months
Products
Top Naniwa products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 29, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Shapton K0702 Blade #1000 Medium Orange
- Price
- $43.97
- Rating
- 4.8/5
- Reviews
- 4,445
- Age
- 13y ago

SHAPTON Ha No Kuromaku Ceramic Whetstone (A-set) Medium Grit (#1000) + Fine Grit (#5000)
- Price
- $101.81
- Rating
- 4.8/5
- Reviews
- 427
- Age
- 10y ago

SHAPTON Ha No Kuromaku Ceramic Whetstone (D-set) - Rough & Medium & Fine Grit (#320 #1000 #5000)
- Price
- $161.48
- Rating
- 4.6/5
- Reviews
- 255
- Age
- 10y ago

Shapton Kuromaku Whetstone Sharpening Stone Set Japanese 1000 & 5000 Grit Knife Sharpening Stones with Knife Sharpening Angle Guide for Kitchen & Chefs Knives
- Price
- $121.69
- Rating
- 4.3/5
- Reviews
- 15
- Age
- 7mo ago

SHAPTON K0709 Blade Blade #320 Rough Blue Black
- Price
- $44.32
- Rating
- 4.8/5
- Reviews
- 6,646
- Age
- 13y ago
Trending
estimated 90-day click momentum
Shapton Kuromaku Whetstone Sharpening Stone Set Japanese 1000 & 5000 Grit Knife Sharpening Stones with Knife Sharpening Angle Guide for Kitchen & Chefs Knives
- Price
- $121.69
- Rating
- 4.3/5
- Reviews
- 15
- Age
- 7mo ago

SHAPTON K0709 Blade Blade #320 Rough Blue Black
- Price
- $44.32
- Rating
- 4.8/5
- Reviews
- 6,646
- Age
- 13y ago

SHAPTON GlassStone 4000 3micro class TYPE WA 50103
- Price
- $67.70
- Rating
- 4.8/5
- Reviews
- 282
- Age
- 16y ago

SHAPTON Ha No Kuromaku Ceramic Whetstone (A-set) Medium Grit (#1000) + Fine Grit (#5000)
- Price
- $101.81
- Rating
- 4.8/5
- Reviews
- 427
- Age
- 10y ago

Shapton K0704 Blade Blade #5000 Finish Enge
- Price
- $60.12
- Rating
- 4.8/5
- Reviews
- 6,646
- Age
- 13y ago
Newest
by launch date
Shapton Kuromaku Whetstone Sharpening Stone Set Japanese 1000 & 5000 Grit Knife Sharpening Stones with Knife Sharpening Angle Guide for Kitchen & Chefs Knives
- Price
- $121.69
- Rating
- 4.3/5
- Reviews
- 15
- Age
- 7mo ago

Shapton Whetstone Orange & Angle Guide Knife Sharpening K0702 Blade Grit 1000 #1000 Medium
- Price
- $57.36
- Rating
- 4.0/5
- Reviews
- 18
- Age
- 1y ago

SHAPTON Ha No Kuromaku Ceramic Whetstone (A-set) Medium Grit (#1000) + Fine Grit (#5000)
- Price
- $101.81
- Rating
- 4.8/5
- Reviews
- 427
- Age
- 10y ago

SHAPTON Ha No Kuromaku Ceramic Whetstone (D-set) - Rough & Medium & Fine Grit (#320 #1000 #5000)
- Price
- $161.48
- Rating
- 4.6/5
- Reviews
- 255
- Age
- 10y ago

SHAPTON Ha No Kuromaku Ceramic Whetstone (F-set) Medium Grit (#1000) + Fine Grit (#5000) + Fine Grit (#8000) + Ultra Fine Grit (#12000) by Shapton
- Price
- $230.13
- Rating
- 4.7/5
- Reviews
- 215
- Age
- 10y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 73% of clicks. A locked shelf that new listings rarely crack.
Brands
2 rising
Sellers
95
Est. top-5 brand share
100%
Top 20: 100%
Est. top-5 click share
73%
Top 20: 100%
Open market
0%
- Shapton93%
- Someie7%
Demand
Naniwa search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Aug, Nov, Dec · busiest ÷ quietest = 2.9×
Search terms
Top Naniwa search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- shapton sharpening stones53K/yr
- shapton35K/yr
- shapton pro 100027K/yr
- (shapton)3K/yr
- shapton kuromaku11K/yr
- shapton 100010K/yr
- shapton pro10K/yr
- shapton glass stone8K/yr
- shapton kuromaku 10005K/yr
- shapton whetstone8K/yr
Reviews and returns
What reviews say buyers love and hate about Naniwa
We read the reviews and the return reasons for every product selling here.
“where can I find instructions in English since I Am brand new at this”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Naniwa questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









