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String Line

Maybe

An estimated 0.3% of orders come back. But products sell for $7.95 on average, outside the sweet spot, so String Line is a Maybe.

Flapen Score
56
56 / 100
Top 17% of 2,225 DIY & Tools niches · +7 vs the category median of 49
Market size
£206K/yr215K searches / yr
90-day growth
+3.9%search demand this quarter
Competition
55%top-5 click share · 15 brands · 83 sellers

Flapen Score

String Line against its category

The dotted line is the DIY & Tools average. Past it, String Line is stronger. Inside it, weaker.

56Maybe
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The String Line market on Amazon at a glance

Shoppers on Amazon United Kingdom searched for String Line 215K times last year and spent an estimated £206K. The top 5 brands take 65% of clicks. Demand peaks in Mar–Apr–May. Flapen scores it 56 out of 100, a Maybe.

01 · Demand

An estimated 12.0% of those searches ended in a purchase.

Shoppers searched for this 215K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 12.0% of those searches ended in a purchase. Searches in the last 90 days moved +3.9% against the 90 days before. Searches, conversion and average price together put the market at an estimated £206K a year.

Searches, last 12 months
215K
Growth, 90 days vs prior 90
+3.9%
Conversion, latest week
12.0%
Market size, estimated
£206Ka year
Peak month
April2.3× the quietest month
Top search term
string line110K searches a year

02 · Price

A sale here is worth £7.95.

Listings sell for £7.95 on average, from £2.74 to £22.68. Amazon reports units sold in ranges. This niche sold 20K to 25K a year. The average listing sells 750 to 1,000 of them. At £7.95 that is £6K to £8K a year per listing.

Average price
£7.95under the $15 to $100 sweet spot
Price range
£2.74–£22.68
Amazon United Kingdom median price
£12.12across 27,606 niches
Units sold a year
20K–25K
Units per listing a year
750–1,000
Revenue per listing a year
£6K–£8K
Returns
0.3%of orders · Amazon United Kingdom median 0.6%

03 · Entry bar

The bar here is low.

43% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 1.7% of listings are out of stock. The average listing ranks #281 within Tarps & Tie-Downs. It carries 785 reviews at 4.40 stars, so a new listing needs social proof before a better product.

Sponsored listings
43%
Prime listings
100%
Out of stock, average day
1.7%
Average rank
#281in Tarps & Tie-Downs
Average rating
4.40 starsAmazon United Kingdom average 4.36 stars
Average reviews
785per listing
Listings tracked
21

04 · Newcomers

2 of last year's 2 launches cleared the first-year sales bar.

2 products launched here in the last 12 months. 2 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 72 months on average, so the names here are established.

Launched, last 12 months
2
Successful launches
2Amazon's first-year sales bar
Average brand age
72 months

Products

Top String Line 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 22, 2026. The live listing can differ.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 55% of clicks. Leaders hold, but buyers still shop past them.

£0£8K£16K£25K£33K101001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

15 falling

Sellers

83

Est. top-5 brand share

65%

Top 20: 100%

Est. top-5 click share

55%

Top 20: 99%

Open market

26%

  • tenn well16%
  • Rolson14%
  • OX Tools12%
  • Spear & Jackson11%
  • Blue Spot Tools11%
  • Tracer9%

Demand

String Line search demand

Weekly searches over the year, seasonality beneath. Pick a range.

6K4KSpike '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Mar, Apr, May · busiest ÷ quietest = 2.3×

Search terms

Top String Line search terms shoppers use

The exact words shoppers type, with estimated yearly volume, growth, and conversion.

  • string line110K/yr
  • builders line25K/yr
  • brick line33K/yr
  • builders string line11K/yr
  • bricklayers line13K/yr
  • bricklaying line16K/yr
  • stringline4K/yr
  • builders string4K/yr

Reviews and returns

What reviews say buyers love and hate about String Line

We read the reviews and the return reasons for every product selling here.

36%of positive reviews mention “Quality-Overall”
29%of negative reviews mention “Quality-Overall”
0.3%of orders come back
“Poor quality control prior to shipping”
A buyer, on “Quality-Overall”29% of negative reviews mention the same topic

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.

18 topics

NegativePositive

FAQ

Common String Line 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