grout pen
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible16.5%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.3%return rate — above 5% kills the launch gate
Quality gap
Great4.1★avg incumbent rating — lower means beatable quality
Market size
Good£438K£438K/yr · 432K searches
Review moat
Bad10,500.67avg incumbent reviews — the moat a new listing must climb
Avg price
Bad£6.15avg listing price — sweet spot $15–$100
Growth
Bad-22.5%90-day search growth — must beat 0% to launch
Competition
Bad97%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
Price range
Bad£3.69–£11.31cheapest 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
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.Peak months: Feb · busiest ÷ quietest = 1.7×
Top grout pen search terms
- grout pen white168K/yr
- grout pen131K/yr
- white grout pen37K/yr
- tile grout pen14K/yr
- white grout pen for tiles15K/yr
- grout pens8K/yr
- waterproof grout pen white3K/yr
- grouting pen white8K/yr
- grout wow pen white9K/yr
- grout wow11K/yr
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.
All 6 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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£3.694.1★20,814 rev
Twin Pack White Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (White)
RAINBOW CHALK MARKERS LTD£6.744.2★6,777 rev
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£5.163.8★1,584 rev
3 x White Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens
RAINBOW CHALK MARKERS LTD£11.314.3★1,998 rev
Grout Pen - Revives & Restores Tile Grout - Water-Based 7ml White
RAINBOW CHALK MARKERS LTD£3.824.0★31,750 rev
Newest
by launch date
Grout Pen Twin Pack | White | 2 x 7ml | Make the appearance of grout cleaner
SureMark£6.1781 rev
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£5.161,584 rev
Twin Pack White Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (White)
RAINBOW CHALK MARKERS LTD£6.746,777 rev
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£3.6920,814 rev
3 x White Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens
RAINBOW CHALK MARKERS LTD£11.311,998 rev
Trending
90-day click momentum3 x White Grout Pens - Designed for Restoring Tile Grout in bathrooms & Kitchens
RAINBOW CHALK MARKERS LTD£11.314.3★
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£3.694.1★
Grout Pen Twin Pack | White | 2 x 7ml | Make the appearance of grout cleaner
SureMark£6.174.3★
Twin Pack White Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (White)
RAINBOW CHALK MARKERS LTD£6.744.2★
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£5.163.8★
What buyers say about grout pen
What buyers praise and complain about, mined from review topics.What buyers love
“Easy to use”
“Better than expected”
“No mess at all”
“Good value”
“Seems to work ok”
“Good product for cleaner looking grout”
“One coat was enough for most of the black areas”
“It really does work”
“Clear instructions”
“Fine for quick fix”
What buyers complain about
“Goes everywhere doesn't do it right”
“Not the best product”
“Not worth the price”
“not sure if it is long lasting or not”
“Always difficult to use”
“The paint is very watery”
“An absolute waste of space”
“poor coverage”
“Doesnt work just leaks everywhere”
“The pen is way too thick to get into shower tile grout”
Top return reasons
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.