---
title: "Window Pens — £101K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/stationery-office-supplies/window-pens"
last_updated: "2026-07-31T16:51:48.659Z"
locale: en
meta:
description: "Niche score 45/100 · £101K/yr market · 158K searches/yr · £8.23 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · £101K/yr market · 158K searches/yr · £8.23 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Window Pens — £101K/yr Amazon UK Niche (2026) - Flapen"
---
# **window pens**
**Skip it**
Soft demand (-12.3% this quarter) — this niche doesn't clear our bar today.
Market size 25Growth 19Conversion 78Competition 45Returns 98Price range 28Avg price 23Brand share 56Review moat 23Quality gap 47
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****7.8%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Good****71%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****58%**
top-5 click share — leaders hold, buyers still browse
**Price range**
**Okay****£3.38–£19.61**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Okay****£101K**
£101K/yr · 158K searches
**Review moat**
**Bad****7,112.33**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Bad****£8.23**
avg listing price — sweet spot $15–$100
**Growth**
**Bad****-12.3%**
90-day search growth — must beat 0% to launch
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=uk&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United Kingdom niche tracking, window pens is a £101K/yr Amazon United Kingdom market (158K searches/yr). The top 5 brands hold 71% of demand. Demand peaks in Oct–Nov–Dec. Verdict: Skip it — 45/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **window pens market data**
- **Units sold / yr**
- **13K–15K**
- avg 250–500/product
- **Revenue / yr**
- **£103K–£123K**
- units × avg price
- **Conversion rate**
- **7.8%**
- **Avg BSR**
- **#71**
- **Page quality**
- **0%**
- **Prime**
- **96%**
- **Sponsored**
- **96%**
- **Out of stock**
- **8.7%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **176 days**
## **Competition & brand share**
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**22**
**Top-5 brand share**
**71%**
Top 20: 100%
**Top-5 click share**
**58%**
Top 20: 97%
**Open market**
**23%**
- VILMA18% - STATIONERY ISLAND17% - Thboxes13% - Chalkola13% - Chalky Crown12% - WINSONS6%
## **Demand & seasonality**
Weekly Amazon search volume, last 99 weeks — -12.3% search growth over the last 90 days.
18K13KSpike '24Black Friday '24Prime Day '25Spike '25Black Friday '25Holiday '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Oct, Nov, Dec · busiest ÷ quietest = 14.7×
[**Open Trend **](https://flapen.com/research/uk/stationery-office-supplies/window-pens/trend)
## **Top window pens search terms**
- **window pens**37K/yr-9.5%7.2% conv. - **glass markers**8K/yr-1.5%2.4% conv. - **chalk pens for windows and glass**22K/yr-9.8%9.7% conv. - **mirror pens**5K/yr+32.9%6.1% conv. - **window pens for glass washable**27K/yr-19.1%8.1% conv. - **window markers**10K/yr-27.2%5.9% conv. - **glass pens wipeable**5K/yr-4.6%8.5% conv. - **glass marker pens**3K/yr-2.9%5.9% conv. - **window markers for glass washable**6K/yr-29.6%9.4% conv. - **window paint pens**10K/yr-48.8%7.5% conv. [**All search terms **](https://flapen.com/research/uk/stationery-office-supplies/window-pens/search-terms)
## **Top window pens 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%5%£5K10%£10K15%£15K20%£20K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**VILMA Liquid Chalk Markers Window Marker for Cars Glass pens Wet Erase Marker Washable Blackboard Pen for Car Window Mirrors Signs Crafts 2MM Tip 12 Pack 12 Colors**VILMA**£6.20**4.5★723 rev](https://www.amazon.co.uk/dp/B09TDF38WT) [2**Thboxes Liquid Chalk Pens 12 Colours 6 mm Wipeable Markers**Thboxes**£7.09**4.5★135 rev](https://www.amazon.co.uk/dp/B0FCFWGG4J) [3**Liquid Chalk Pens - Dry Erase Marker Pens - Chalk Pens for Chalkboards Signs Windows Blackboard Glass Reversible Tip (8 Pack) (Multicolored 6mm)**Chalky Crown**£7.28**4.4★44,007 rev](https://www.amazon.co.uk/dp/B07Q4K1HRJ) [4**STATIONERY ISLAND Chalk Pens for blackboard Liquid Chalk Markers for Chalkboard and Glass Wipeable Chalk pens for Window Drawing 10 Colours**STATIONERY ISLAND**£6.06**4.5★8,329 rev](https://www.amazon.co.uk/dp/B0179O1PXA) [5**STATIONERY ISLAND Chalk Pens for Blackboard Liquid Chalk Markers for Chalkboard Glass Window Drawing 3mm 8 Colours**STATIONERY ISLAND**£5.38**4.4★12,859 rev](https://www.amazon.co.uk/dp/B00PUNI5T0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Chalkola 20 Liquid Chalk Pens for Blackboard Chalkboards Window Car**Chalkola**£15.12**4,193 rev9mo ago](https://www.amazon.co.uk/dp/B0F7WP87ZK) [**Hueritfly White Liquid Chalk pens - 6 Pack Non-Toxic & Dust-Free Chalk Pens for Windows and Glass Blackboards Whiteboards Bright Colors Markers for Back to School**Hueritfly**£7.29**74 rev10mo ago](https://www.amazon.co.uk/dp/B0FPMMCF11) [**Lenski Liquid Chalk Pens 10 Colour Liquid Chalk Markers Gifts for Kids 10mm Chalk Pens for Blackboards Window Glass Chalkboards Reversible Tip Girls Birthday Presents**Lenski**£11.12**297 rev11mo ago](https://www.amazon.co.uk/dp/B0FNVM8BYH) [**WINSONS Chalk Pens 16 Colours Non-Toxic Eraserble Markers 6mm Round Tip**WINSONS**£9.47**310 rev1y ago](https://www.amazon.co.uk/dp/B0FGJQFS7L) [**Thboxes Liquid Chalk Pens 12 Colours 6 mm Wipeable Markers**Thboxes**£7.09**135 rev1y ago](https://www.amazon.co.uk/dp/B0FCFWGG4J)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Lenski Liquid Chalk Pens 10 Colour Liquid Chalk Markers Gifts for Kids 10mm Chalk Pens for Blackboards Window Glass Chalkboards Reversible Tip Girls Birthday Presents**Lenski**£11.12**4.6★**▲ 746%**](https://www.amazon.co.uk/dp/B0FNVM8BYH) [**ARTISTRO Acrylic Paint Markers for Fabric Rock Wood Glass Craft - 24 Quick Dry Dual-Tip Fabric Paint Pens for Halloween Decorations - Pumpkin Painting Kit Art Supplies Christmas Gift**ARTISTRO**£6.88**4.5★**▲ 233%**](https://www.amazon.co.uk/dp/B0CXJ1TNV1) [**YITHINC Acrylic Paint Pens for Rock Painting Ceramic Metal Paper Glass Canvas Fabric Wood Porcelain Pebble Easter Decoration & Crafts Pumpkin Painting Kit Acrylic Markers for Adults(28 Colors)**YITHINC**£6.26**4.4★**▲ 177%**](https://www.amazon.co.uk/dp/B07WS8CTLG) [**WINSONS Chalk Pens 16 Colours Non-Toxic Eraserble Markers 6mm Round Tip**WINSONS**£9.47**4.5★**▲ 157%**](https://www.amazon.co.uk/dp/B0FGJQFS7L) [**Chalkola 20 Liquid Chalk Pens for Blackboard Chalkboards Window Car**Chalkola**£15.12**4.5★**▲ 146%**](https://www.amazon.co.uk/dp/B0F7WP87ZK)
**~~View all trending →~~**
## **What buyers say about window pens**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Color**23%
*“The colours are vibrant”*
**Quality-Overall**16%
*“These are excellent pens”*
**Value For Money**10%
*“Good value”*
**Ease Of Use**8%
*“are easy to handle”*
**Advertised Vs Actual Product**6%
*“They did the job”*
**Pen/Pencil Quality**6%
*“Lovely vibrant pens”*
**Ease Of Cleaning**5%
*“easy to clean off”*
**Writing Experience**3%
*“very clear for writing”*
**Drawing Experience**2%
*“as these pens draw so smoothly”*
**Efficiency**2%
*“Worked well”*
### **What buyers complain about **
**Functionality-Overall**10%
*“Takes time to get them working”*
**Color**9%
*“Lack of colour”*
**Drying Time**6%
*“Dry out too quickly”*
**Leak-Proof**5%
*“leak”*
**Quality-Overall**5%
*“Cheap”*
**Nib/Tip Quality**5%
*“Found it difficult to keep the flow of the chalk in the tip”*
**Durability**4%
*“a couple of the ones broke instantly”*
**Stain Resistance**4%
*“Stained my blackboard”*
**Erasability**4%
*“they are definitely NOT easily erasable”*
**Moist/Dry**3%
*“a few had dried out”*
### **Top return reasons **
**Functionality-Overall**23%
**Color**11%
**Quality-Overall**6%
**Size-Overall**5%
**Writing Experience**5%
**Gifting Purpose**4%
**Nib/Tip Quality**4%
**Value For Money**3%
**Advertised Vs Actual Product**3%
**Product Condition**3%
## **Common questions**
- **Is window pens profitable to sell on Amazon United Kingdom?**
- The niche generates £101K/yr across 24 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -12.3%. Flapen's verdict: Skip it (45/100).
- **How competitive is the window pens niche?**
- 17 brands and 22 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 71% of demand.
- **What do buyers complain about in window pens?**
- Top complaints mined from reviews: Functionality-Overall, Color, Drying Time. The return rate is 0.4%.
- **When does demand for window pens peak?**
- Demand peaks in Oct–Nov–Dec; the busiest month runs 14.7× the quietest.
- **What does it cost to enter the window pens niche?**
- Listings span £3.38–£19.61; the average listing price is £8.23 (sweet spot $15–$100). The average incumbent carries 7,112 reviews — the moat a new listing must climb.
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