---
title: "Grout Pen — £438K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/grout-pen"
last_updated: "2026-07-31T14:59:18.992Z"
locale: en
meta:
description: "Niche score 41/100 · £438K/yr market · 432K searches/yr · £6.15 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · £438K/yr market · 432K searches/yr · £6.15 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Grout Pen — £438K/yr Amazon UK Niche (2026) - Flapen"
---
# **grout pen**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 57Growth 14Conversion 98Competition 3Returns 98Price range 0Avg price 17Brand share 0Review moat 21Quality gap 87
**Conversion**
**Incredible****16.5%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Quality gap**
**Great****4.1★**
avg incumbent rating — lower means beatable quality
**Market size**
**Good****£438K**
£438K/yr · 432K searches
**Review moat**
**Bad****10,500.67**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Bad****£6.15**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-22.5%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****97%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Price range**
**Bad****£3.69–£11.31**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, grout pen is a £438K/yr Amazon United Kingdom market (432K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Feb. Verdict: Skip it — 41/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **grout pen market data**
- **Units sold / yr**
- **60K–80K**
- avg 8,000–10,000/product
- **Revenue / yr**
- **£369K–£492K**
- units × avg price
- **Conversion rate**
- **16.5%**
- **Avg BSR**
- **#20**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **39 months**
- **Avg seller age**
- **172 days**
## **Competition & brand share**
The top 5 products capture 97% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**4 **▼falling
**Sellers**
**45**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**97%**
Top 20: 100%
**Open market**
**0%**
- Unibond54% - RAINBOW CHALK MARKERS LTD36% - flintronic7% - SureMark3% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -22.5% search growth over the last 90 days.
13K8KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Feb · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/grout-pen/trend)
## **Top grout pen search terms**
- **grout pen white**168K/yr-27.8%15.2% conv. - **grout pen**131K/yr-15.5%8.7% conv. - **white grout pen**37K/yr-13.1%18.1% conv. - **tile grout pen**14K/yr-9.2%7.9% conv. - **white grout pen for tiles**15K/yr-31.7%13.2% conv. - **grout pens**8K/yr-9.7%5.3% conv. - **waterproof grout pen white**3K/yr+134.3%11.3% conv. - **grouting pen white**8K/yr-23.7%12.3% conv. - **grout wow pen white**9K/yr-45.1%8.6% conv. - **grout wow**11K/yr-55.5%6.4% conv. [**All search terms **](https://flapen.com/research/uk/diy-tools/grout-pen/search-terms)
## **Top grout pen 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.
0%15%£66K30%£131K45%£197K60%£263K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 6 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Unibond Grout Reviver Pen White Grout Pen for Bathroom Grout Joints Easy to Use Tile Grout Pen Whitener for Restoring Discoloured & Faded Joints 1x7ml**Unibond**£3.69**4.1★20,814 rev](https://www.amazon.co.uk/dp/B00LRAA86I) [2**Twin Pack White Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (White)**RAINBOW CHALK MARKERS LTD**£6.74**4.2★6,777 rev](https://www.amazon.co.uk/dp/B09GBKD5Q4) [3**Flintronic 6PCS Grout Pen White Tile Paint Marker with Replacement Nib Tiles Grout Pen Wall Repair Pens Tile Grout Reviver Pens for Bathrooms Kitchen Floor Tile Wall Lines**flintronic**£5.16**3.8★1,584 rev](https://www.amazon.co.uk/dp/B0CF9NBKC1) [4**3 x White Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens**RAINBOW CHALK MARKERS LTD**£11.31**4.3★1,998 rev](https://www.amazon.co.uk/dp/B08S7NNYT4) [5**Grout Pen - Revives & Restores Tile Grout - Water-Based 7ml White**RAINBOW CHALK MARKERS LTD**£3.82**4.0★31,750 rev](https://www.amazon.co.uk/dp/B006LMFJS4)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Grout Pen Twin Pack | White | 2 x 7ml | Make the appearance of grout cleaner**SureMark**£6.17**81 rev9mo ago](https://www.amazon.co.uk/dp/B0FX138LMC) [**Flintronic 6PCS Grout Pen White Tile Paint Marker with Replacement Nib Tiles Grout Pen Wall Repair Pens Tile Grout Reviver Pens for Bathrooms Kitchen Floor Tile Wall Lines**flintronic**£5.16**1,584 rev2y ago](https://www.amazon.co.uk/dp/B0CF9NBKC1) [**Twin Pack White Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (White)**RAINBOW CHALK MARKERS LTD**£6.74**6,777 rev4y ago](https://www.amazon.co.uk/dp/B09GBKD5Q4) [**Unibond Grout Reviver Pen White Grout Pen for Bathroom Grout Joints Easy to Use Tile Grout Pen Whitener for Restoring Discoloured & Faded Joints 1x7ml**Unibond**£3.69**20,814 rev12y ago](https://www.amazon.co.uk/dp/B00LRAA86I) [**3 x White Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens**RAINBOW CHALK MARKERS LTD**£11.31**1,998 rev14y ago](https://www.amazon.co.uk/dp/B08S7NNYT4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**3 x White Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens**RAINBOW CHALK MARKERS LTD**£11.31**4.3★**▲ 41%**](https://www.amazon.co.uk/dp/B08S7NNYT4) [**Unibond Grout Reviver Pen White Grout Pen for Bathroom Grout Joints Easy to Use Tile Grout Pen Whitener for Restoring Discoloured & Faded Joints 1x7ml**Unibond**£3.69**4.1★**▲ 26%**](https://www.amazon.co.uk/dp/B00LRAA86I) [**Grout Pen Twin Pack | White | 2 x 7ml | Make the appearance of grout cleaner**SureMark**£6.17**4.3★**▲ 14%**](https://www.amazon.co.uk/dp/B0FX138LMC) [**Twin Pack White Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (White)**RAINBOW CHALK MARKERS LTD**£6.74**4.2★**— 2%**](https://www.amazon.co.uk/dp/B09GBKD5Q4) [**Flintronic 6PCS Grout Pen White Tile Paint Marker with Replacement Nib Tiles Grout Pen Wall Repair Pens Tile Grout Reviver Pens for Bathrooms Kitchen Floor Tile Wall Lines**flintronic**£5.16**3.8★**▼ 30%**](https://www.amazon.co.uk/dp/B0CF9NBKC1)
**~~View all trending →~~**
## **What buyers say about grout pen**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Ease Of Use**31%
*“Easy to use”*
**Advertised Vs Actual Product**17%
*“Better than expected”*
**Quality-Overall**12%
*“No mess at all”*
**Value For Money**10%
*“Good value”*
**Efficiency**7%
*“Seems to work ok”*
**Ease Of Cleaning**3%
*“Good product for cleaner looking grout”*
**Color**2%
*“One coat was enough for most of the black areas”*
**Functionality-Overall**2%
*“It really does work”*
**Instructions/User Manual/Troubleshooting**2%
*“Clear instructions”*
**Maintenance And Repair**1%
*“Fine for quick fix”*
### **What buyers complain about **
**Functionality-Overall**17%
*“Goes everywhere doesn't do it right”*
**Quality-Overall**17%
*“Not the best product”*
**Value For Money**11%
*“Not worth the price”*
**Durability**10%
*“not sure if it is long lasting or not”*
**Ease Of Use**5%
*“Always difficult to use”*
**Paint Quality**5%
*“The paint is very watery”*
**Natural Resource Wastage**5%
*“An absolute waste of space”*
**Coverage**4%
*“poor coverage”*
**Leak-Proof**4%
*“Doesnt work just leaks everywhere”*
**Thickness**3%
*“The pen is way too thick to get into shower tile grout”*
### **Top return reasons **
**Functionality-Overall**34%
**Color**20%
**Quality-Overall**8%
**Leak-Proof**8%
**Defective Material/Parts**6%
**Paint Quality**4%
**Advertised Vs Actual Product**3%
**Coverage**3%
**Size-Overall**2%
**Durability**2%
## **Common questions**
- **Is grout pen profitable to sell on Amazon United Kingdom?**
- The niche generates £438K/yr across 6 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -22.5%. Flapen's verdict: Skip it (41/100).
- **How competitive is the grout pen niche?**
- 4 brands and 45 sellers compete. The top 5 products take 97% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in grout pen?**
- Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Value For Money. The return rate is 0.3%.
- **When does demand for grout pen peak?**
- Demand peaks in Feb; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the grout pen niche?**
- Listings span £3.69–£11.31; the average listing price is £6.15 (sweet spot $15–$100). The average incumbent carries 10,501 reviews — the moat a new listing must climb.
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