---
title: "Sister Birthday Card — £431K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/stationery-office-supplies/sister-birthday-card"
last_updated: "2026-07-31T07:25:17.020Z"
locale: en
meta:
description: "Niche score 60/100 · £431K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 60/100 · £431K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Sister Birthday Card — £431K/yr Amazon UK Niche (2026) - Flapen"
---
# **sister birthday card**
**Worth a look**
Shows low returns (0.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 57Growth 24Conversion 86Competition 86Returns 99Price range 0Avg price 9Brand share 91Review moat 87Quality gap 21
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Brand share**
**Great****44%**
top-5 brand share — no brand owns this niche
**Review moat**
**Great****255.43**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Great****9.8%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Great****29%**
top-5 click share — an open shelf
**Market size**
**Good****£431K**
£431K/yr · 1.3M searches
**Growth**
**Bad****-1.0%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Bad****£3.36**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****£1.65–£7.86**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**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, sister birthday card is a £431K/yr Amazon United Kingdom market (1.3M searches/yr). The top 5 brands hold 44% of demand. Verdict: Worth a look — 60/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sister birthday card market data**
- **Units sold / yr**
- **100K–125K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **£336K–£420K**
- units × avg price
- **Conversion rate**
- **9.8%**
- **Avg BSR**
- **#1,592**
- **Page quality**
- **0%**
- **Prime**
- **96%**
- **Sponsored**
- **76%**
- **Out of stock**
- **2.1%**
- **Avg brand age**
- **29 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
Clicks spread well past the top 5 (29% combined) — an open shelf where new products get seen.
**Brands**
**38 **▼falling
**Sellers**
**60**
**Top-5 brand share**
**44%**
Top 20: 89%
**Top-5 click share**
**29%**
Top 20: 69%
**Open market**
**50%**
- Piccadilly Greetings13% - Cherry Orchard9% - Printperfect8% - Me To You7% - Central 237% - Emotional Rescue6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -1.0% search growth over the last 90 days.
30K20KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/uk/stationery-office-supplies/sister-birthday-card/trend)
## **Top sister birthday card search terms**
- **sister birthday card**732K/yr-2.0%6.6% conv. - **birthday card sister**132K/yr-0.4%7.1% conv. - **birthday card for sister**65K/yr-5.3%7.0% conv. - **birthday cards for sister**59K/yr-9.2%6.8% conv. - **sister birthday cards**47K/yr-1.9%5.8% conv. - **funny sister birthday card**38K/yr-1.2%2.5% conv. - **sister birthday card funny**38K/yr+1.5%2.8% conv. - **happy birthday sister card**36K/yr+8.6%6.2% conv. - **sister card**33K/yr+14.0%6.3% conv. - **happy birthday sister**19K/yr+1.6%3.8% conv. [**All search terms **](https://flapen.com/research/uk/stationery-office-supplies/sister-birthday-card/search-terms)
## **Top sister birthday card 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%2%£9K4%£17K6%£26K8%£35K1101001K10K 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**Cherry Orchard Fabulous Sister Birthday Card with Envelope Gorgeous design of Cocktail glasses Balloons flowers & hearts - Gold Foil Finish**Cherry Orchard**£2.66**4.8★318 rev](https://www.amazon.co.uk/dp/B0DCKBGSLX) [2**Model Family Funny Birthday Card for Sister - Amazing Sister Night Out - Humourous Greetings Card Multi-Coloured 18.4 x 15.4 cm**Emotional Rescue**£3.36**4.7★111 rev](https://www.amazon.co.uk/dp/B0FD3X3LBY) [3**Funny Retro Card For Women - Bucket List - Hilarious Birthday Greeting Cards For Sister Cousin Nana Mum - Best Friend Birthday Ideas - Mothers Day Gift for Her - Comes With Stickers**Central 23**£3.37**4.8★419 rev](https://www.amazon.co.uk/dp/B0D795QJFH) [4**Hallmark Birthday Card for Sister Classic Floral Design Green Pink**Hallmark**£2.54**4.6★1,725 rev](https://www.amazon.co.uk/dp/B07XTXCFZL) [5**Piccadilly Greetings Piccadilly Greetings A20202 Traditional Birthday Card Sister - 9 x 6 inches red**Piccadilly Greetings**£3.34**4.6★189 rev](https://www.amazon.co.uk/dp/B07W4L83K6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Mirelia Sister Birthday Card Happy Birthday Card For Sister From Sister Or Brother Premium Card With Sweet Inside Message 20.5 x 13.5 cm with Envelope**Mirelia**£4.29**39 rev3mo ago](https://www.amazon.co.uk/dp/B0GXXWPHYR) [**Funny Birthday Card for Sister Sheep & Paparazzi Wolves Design Cute Humorous A5 Card with Red Envelope Thick Premium Matte Finish Blank Inside**Sildecy**£3.64**3 rev4mo ago](https://www.amazon.co.uk/dp/B0GT5ZLQ9S) [**Birthday Card for Sister. Floral Heart Design with Gold Foiled text. 150x150mm supplied with Envelope. Eco-friendly. Message inside. Made in Britain.**Absolutely Yours**£3.26**23 rev4mo ago](https://www.amazon.co.uk/dp/B0GQTSMF1R) [**Me To You Tatty Teddy Fabulous Sister Cute Luxury Gold Foil Birthday Card 6 X 9 Inches - Official Collection**Me To You**£2.14**36 rev5mo ago](https://www.amazon.co.uk/dp/B0GKPT1BJM) [**Me To You Tatty Teddy Sister Bears With Heart Glasses Luxury Gold Foil Birthday Card 5 X 7 Inches - Official Collection**Me To You**£1.65**12 rev6mo ago](https://www.amazon.co.uk/dp/B0GGC7M6Z2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Mirelia Sister Birthday Card Happy Birthday Card For Sister From Sister Or Brother Premium Card With Sweet Inside Message 20.5 x 13.5 cm with Envelope**Mirelia**£4.29**4.6★**▲ 338%**](https://www.amazon.co.uk/dp/B0GXXWPHYR) [**Funny Birthday Card for Sister Sheep & Paparazzi Wolves Design Cute Humorous A5 Card with Red Envelope Thick Premium Matte Finish Blank Inside**Sildecy**£3.64**4.4★**▲ 331%**](https://www.amazon.co.uk/dp/B0GT5ZLQ9S) [**Birthday Card for Sister. Floral Heart Design with Gold Foiled text. 150x150mm supplied with Envelope. Eco-friendly. Message inside. Made in Britain.**Absolutely Yours**£3.26**4.9★**▲ 200%**](https://www.amazon.co.uk/dp/B0GQTSMF1R) [**Me To You Tatty Teddy Sister Bears With Heart Glasses Luxury Gold Foil Birthday Card 5 X 7 Inches - Official Collection**Me To You**£1.65**4.7★**▲ 150%**](https://www.amazon.co.uk/dp/B0GGC7M6Z2) [**Me To You Tatty Teddy Fabulous Sister Cute Luxury Gold Foil Birthday Card 6 X 9 Inches - Official Collection**Me To You**£2.14**4.8★**▲ 131%**](https://www.amazon.co.uk/dp/B0GKPT1BJM)
**~~View all trending →~~**
## **What buyers say about sister birthday card**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**41%
*“Brilliant quality”*
**Value For Money**22%
*“Good Price”*
**Fun/Entertainment Experience**7%
*“Good quality funny card”*
**Advertised Vs Actual Product**7%
*“Just as it was advertised”*
**Size-Overall**5%
*“nice size”*
**Design-Overall**5%
*“beautiful design”*
**Color**3%
*“Bright and lovely”*
**Print Quality**1%
*“Clearly printed on glossy 300gsm thick cardstock”*
**Thickness**1%
*“seems to be a nice thick card”*
**Paper Quality**1%
*“The card is thick and good quality and the printing is sharp and vivid”*
### **What buyers complain about **
**Functionality-Overall**24%
*“The card arrived yesterday not working”*
**Advertised Vs Actual Product**21%
*“Not quite what it looks like”*
**Size-Overall**10%
*“Quite small”*
**Value For Money**10%
*“This card was poor value for the price”*
**Gifting Purpose**6%
*“disappointed that it did not come with an envelope is that normal procedure when buying a birthday card confused”*
**Quality-Overall**5%
*“Cheap and not as in photo”*
**Flatness**4%
*“it's just a flat image”*
**Print Quality**4%
*“The stuff printed on the back is a little obtrusive”*
**Wrinkles**2%
*“The inner is also wrinkled - quality very disappointing overall”*
**Adhesion/Stickiness**2%
*“it had no adhesive around the flap to seal it”*
### **Top return reasons **
**Functionality-Overall**53%
**Quality-Overall**12%
**Defective Material/Parts**6%
**Advertised Vs Actual Product**4%
**Display Colors**2%
**Moist/Dry**2%
**Color**2%
**Value For Money**2%
**Battery Life**2%
**Mechanism Issues**2%
## **Common questions**
- **Is sister birthday card profitable to sell on Amazon United Kingdom?**
- The niche generates £431K/yr across 68 tracked products. 0 of 20 products launched in the last 360 days are still selling. 90-day search growth is -1.0%. Flapen's verdict: Worth a look (60/100).
- **How competitive is the sister birthday card niche?**
- 38 brands and 60 sellers compete. The top 5 products take 29% of clicks and top 5 brands hold 44% of demand.
- **What do buyers complain about in sister birthday card?**
- Top complaints mined from reviews: Functionality-Overall, Advertised Vs Actual Product, Size-Overall. The return rate is 0.1%.
- **When does demand for sister birthday card peak?**
- Demand is steady year-round — the busiest month runs 1.7× the quietest.
- **What does it cost to enter the sister birthday card niche?**
- Listings span £1.65–£7.86; the average listing price is £3.36 (sweet spot $15–$100). The average incumbent carries 255 reviews — the moat a new listing must climb.
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