---
title: "Black Grout Pen — £45K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/black-grout-pen"
last_updated: "2026-07-31T08:42:13.748Z"
locale: en
meta:
description: "Niche score 42/100 · £45K/yr market · 50K searches/yr · £5.79 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 42/100 · £45K/yr market · 50K searches/yr · £5.79 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Black Grout Pen — £45K/yr Amazon UK Niche (2026) - Flapen"
---
# **black grout pen**
**Skip it**
Prices mostly outside the sweet spot ($3.84–$10.79) — this niche doesn't clear our bar today.
Market size 11Growth 10Conversion 97Competition 17Returns 96Price range 0Avg price 16Brand share 27Review moat 65Quality gap 98
**Quality gap**
**Incredible****3.7★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Incredible****15.5%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.8%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****881.23**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****89%**
top-5 brand share — brands hold most of the demand
**Competition**
**Bad****80%**
top-5 click share — a locked-up shelf
**Avg price**
**Bad****£5.79**
avg listing price — sweet spot $15–$100
**Market size**
**Bad****£45K**
£45K/yr · 50K searches
**Growth**
**Bad****-29.8%**
90-day search growth — must beat 0% to launch
**Price range**
**Bad****£3.84–£10.79**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** Quality Gap**](https://flapen.com/research/niches?market=uk&signal=quality_gap "Avg rating < 4.0")
According to Flapen's Amazon United Kingdom niche tracking, black grout pen is a £45K/yr Amazon United Kingdom market (50K searches/yr). The top 5 brands hold 89% of demand. Demand peaks in Mar. Verdict: Skip it — 42/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **black grout pen market data**
- **Units sold / yr**
- **6K–8K**
- avg 500–750/product
- **Revenue / yr**
- **£35K–£46K**
- units × avg price
- **Conversion rate**
- **15.5%**
- **Avg BSR**
- **#158**
- **Page quality**
- **0%**
- **Prime**
- **92%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **31 months**
- **Avg seller age**
- **204 days**
## **Competition & brand share**
The top 5 products capture 80% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**11 **▲rising
**Sellers**
**13**
**Top-5 brand share**
**89%**
Top 20: 100%
**Top-5 click share**
**80%**
Top 20: 100%
**Open market**
**9%**
- RAINBOW CHALK MARKERS LTD42% - DONQL24% - Floor-Fix Pro14% - Vryth5% - Lumoia5% - flintronic3% - Open — no brand owns it (5 brands, 9%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -29.8% search growth over the last 90 days.
3K2KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Mar · busiest ÷ quietest = 2.2×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/black-grout-pen/trend)
## **Top black grout pen search terms**
- **black grout pen**31K/yr-27.5%14.2% conv. - **grout pen black**10K/yr-24.8%13.3% conv. - **black grout pen for tiles**9K/yr-42.3%12.7% conv. [**All search terms **](https://flapen.com/research/uk/diy-tools/black-grout-pen/search-terms)
## **Top black 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%10%£5K20%£9K30%£14K40%£18K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**DONQL 6Pcs Tile Pen Black Grout Pen for Tiles Bathroom with Replacement Nib Tips Anti-Grout Tile Pen Marker for Restoring Tile Grout Wall Floor Bathroom Kitchen and Floor Tiles (Black)**DONQL**£4.94**4.0★974 rev](https://www.amazon.co.uk/dp/B0BQ6WVKPB) [2**Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (Black)**RAINBOW CHALK MARKERS LTD**£3.84**4.1★5,507 rev](https://www.amazon.co.uk/dp/B006MCRIA0) [3**Twin Pack (BLACK) Grout Pen - Designed for restoring tile grout in bathrooms & kitchens**RAINBOW CHALK MARKERS LTD**£6.67**4.2★1,308 rev](https://www.amazon.co.uk/dp/B09GG8J3JY) [4**Black Grout Pen Tile Grout Paint Marker From Floor-Fix Pro | Waterproof Grout Colorant & Sealer Pen | Bathroom & Kitchen Tile Grout Whitener | Narrow 5mm Precision Tip | 2 Pack**Floor-Fix Pro**£7.43**3.6★9 rev](https://www.amazon.co.uk/dp/B0FYFXBDJB) [5**3 x BLACK Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens**RAINBOW CHALK MARKERS LTD**£10.79**4.1★1,000 rev](https://www.amazon.co.uk/dp/B08SCT1SGB)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**4PCS Grout Pen Black Tile Grout Pen Set Tile Paint Marker Easy to Use Reviver for Restoring Discoloured & Faded Joints in Bathrooms Kitchen Floor Wall Lines**Lumoia**£5.32**0 rev3mo ago](https://www.amazon.co.uk/dp/B0GTV2X1P1) [**Grout Pen Twin Pack Black Tile Grout Repair Pen for Bathroom and Kitchen Restores and Colors Grout Lines Anti-Mold Formula Covers up to 120m**Rivvra**£4.08**2 rev5mo ago](https://www.amazon.co.uk/dp/B0GLH3B1R8) [**Grout Pen Patio Grout Filler Pen Surface Lines Repair Marker Pen**SNMYGS**£3.87**0 rev5mo ago](https://www.amazon.co.uk/dp/B0GJJQSR21) [**4PCS Black Grout Pen Tile Paint Marker Grout Repairer for Tiles Wall and Floor Reviver Joints Repair Pens Easy to Use for Restoring Tile Bathroom Grout Wall Floor Kitchen Porch Patio Repair (Black)**Wufaa**£4.83**6 rev6mo ago](https://www.amazon.co.uk/dp/B0GHM7WXM6) [**Black Grout Pen Tile Grout Paint Marker From Floor-Fix Pro | Waterproof Grout Colorant & Sealer Pen | Bathroom & Kitchen Tile Grout Whitener | Narrow 5mm Precision Tip | 2 Pack**Floor-Fix Pro**£7.43**9 rev8mo ago](https://www.amazon.co.uk/dp/B0FYFXBDJB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**4PCS Grout Pen Black Tile Grout Pen Set Tile Paint Marker Easy to Use Reviver for Restoring Discoloured & Faded Joints in Bathrooms Kitchen Floor Wall Lines**Lumoia**£5.32**0.0★**▲ 342%**](https://www.amazon.co.uk/dp/B0GTV2X1P1) [**Grout Pen Twin Pack Black Tile Grout Repair Pen for Bathroom and Kitchen Restores and Colors Grout Lines Anti-Mold Formula Covers up to 120m**Rivvra**£4.08**2.5★**▲ 311%**](https://www.amazon.co.uk/dp/B0GLH3B1R8) [**4PCS Black Grout Pen Tile Paint Marker Grout Repairer for Tiles Wall and Floor Reviver Joints Repair Pens Easy to Use for Restoring Tile Bathroom Grout Wall Floor Kitchen Porch Patio Repair (Black)**Wufaa**£4.83**3.2★**▲ 243%**](https://www.amazon.co.uk/dp/B0GHM7WXM6) [**Black Grout Pen Tile Grout Paint Marker From Floor-Fix Pro | Waterproof Grout Colorant & Sealer Pen | Bathroom & Kitchen Tile Grout Whitener | Narrow 5mm Precision Tip | 2 Pack**Floor-Fix Pro**£7.43**3.6★**▲ 231%**](https://www.amazon.co.uk/dp/B0FYFXBDJB) [**Grout Pen Patio Grout Filler Pen Surface Lines Repair Marker Pen**SNMYGS**£3.87**0.0★**▲ 156%**](https://www.amazon.co.uk/dp/B0GJJQSR21)
**~~View all trending →~~**
## **What buyers say about black grout pen**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Ease Of Use**24%
*“Easy to use”*
**Advertised Vs Actual Product**21%
*“Does the job”*
**Value For Money**16%
*“Good for the price”*
**Color**7%
*“Lasts well, good colour”*
**Quality-Overall**6%
*“Great quality”*
**Efficiency**5%
*“Works very well”*
**Ease Of Cleaning**5%
*“Great easy to use just the ink bleeds alot so can be messy”*
**Durability**4%
*“Surprisingly durable”*
**Weight Light**1%
*“They are light”*
**Paint Quality**1%
*“The black colour goes on smoothly and gives a clean, consistent finish”*
### **What buyers complain about **
**Water Resistance**22%
*“Not waterproof”*
**Quality-Overall**20%
*“buy a better well known make”*
**Color**10%
*“dark black unlike some of the alternatives which I have used before”*
**Paint Quality**10%
*“The paint is far too thick to flow properly between the tiles”*
**Ease Of Cleaning**9%
*“It has made a mess of my bathroom”*
**Value For Money**5%
*“Is the product good value for money: No”*
**Instructions/User Manual/Troubleshooting**3%
*“The black ink did not come out by following instructions”*
**Thickness**2%
*“Disappointing Results – Too Thick and Too Dry”*
**Durability**2%
*“So not great value for money or doesnt have durability”*
**Advertised Vs Actual Product**2%
*“The pens are advertised as grout revivers, but in reality they behave much more like standard wipeboard markers than a durable tile grout solution”*
### **Top return reasons **
**Color**38%
**Functionality-Overall**20%
**Leak-Proof**12%
**Quality-Overall**7%
**Advertised Vs Actual Product**5%
**Ease Of Cleaning**4%
**Compatibility-Overall**3%
**Defective Material/Parts**3%
**Water Resistance**2%
**Value For Money**2%
## **Common questions**
- **Is black grout pen profitable to sell on Amazon United Kingdom?**
- The niche generates £45K/yr across 13 tracked products. 0 of 7 products launched in the last 360 days are still selling. 90-day search growth is -29.8%. Flapen's verdict: Skip it (42/100).
- **How competitive is the black grout pen niche?**
- 11 brands and 13 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 89% of demand.
- **What do buyers complain about in black grout pen?**
- Top complaints mined from reviews: Water Resistance, Quality-Overall, Color. The return rate is 0.8%.
- **When does demand for black grout pen peak?**
- Demand peaks in Mar; the busiest month runs 2.2× the quietest.
- **What does it cost to enter the black grout pen niche?**
- Listings span £3.84–£10.79; the average listing price is £5.79 (sweet spot $15–$100). The average incumbent carries 881 reviews — the moat a new listing must climb.
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