---
title: "Sister in Law Birthday Cards — £93K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/stationery-office-supplies/sister-in-law-birthday-cards"
last_updated: "2026-07-31T11:44:16.894Z"
locale: en
meta:
description: "Niche score 53/100 · £93K/yr market · 221K searches/yr. Prices mostly outside the sweet spot ($2.08–$5.85) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · £93K/yr market · 221K searches/yr. Prices mostly outside the sweet spot ($2.08–$5.85) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Sister in Law Birthday Cards — £93K/yr Amazon UK Niche (2026) - Flapen"
---
# **sister in law birthday cards**
**Worth a look**
Shows low returns (0.1%), but prices mostly outside the sweet spot ($2.08–$5.85) keeps it on the watch list.
Market size 23Growth 22Conversion 96Competition 78Returns 100Price range 0Avg price 9Brand share 79Review moat 87Quality gap 20
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.4%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Great****256.98**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Great****56%**
top-5 brand share — no brand owns this niche
**Competition**
**Great****37%**
top-5 click share — an open shelf
**Market size**
**Bad****£93K**
£93K/yr · 221K searches
**Growth**
**Bad****-6.6%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Bad****£3.15**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****£2.08–£5.85**
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%") [** Low Review Barrier**](https://flapen.com/research/niches?market=uk&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United Kingdom niche tracking, sister in law birthday cards is a £93K/yr Amazon United Kingdom market (221K searches/yr). The top 5 brands hold 56% of demand. Verdict: Worth a look — 53/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sister in law birthday cards market data**
- **Units sold / yr**
- **25K–30K**
- avg 250–500/product
- **Revenue / yr**
- **£79K–£95K**
- units × avg price
- **Conversion rate**
- **13.4%**
- **Avg BSR**
- **#2,786**
- **Page quality**
- **0%**
- **Prime**
- **91%**
- **Sponsored**
- **77%**
- **Out of stock**
- **3.3%**
- **Avg brand age**
- **32 months**
- **Avg seller age**
- **177 days**
## **Competition & brand share**
Clicks spread well past the top 5 (37% combined) — an open shelf where new products get seen.
**Brands**
**21 **▼falling
**Sellers**
**47**
**Top-5 brand share**
**56%**
Top 20: 99%
**Top-5 click share**
**37%**
Top 20: 79%
**Open market**
**38%**
- Cherry Orchard14% - Me To You14% - Old English Company11% - Olivia Samuel9% - Piccadilly Greetings9% - Card Essentials7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -6.6% search growth over the last 90 days.
5K3KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 2.0×
[**Open Trend **](https://flapen.com/research/uk/stationery-office-supplies/sister-in-law-birthday-cards/trend)
## **Top sister in law birthday cards search terms**
- **sister in law birthday cards**134K/yr-9.0%10.5% conv. - **sister in law birthday card**33K/yr+0.2%8.5% conv. - **birthday card sister in law**21K/yr-1.1%10.1% conv. - **birthday card for sister in law**11K/yr-5.4%9.4% conv. - **birthday cards for sister in law**11K/yr-10.7%8.1% conv. - **sister in law card**6K/yr-9.8%9.2% conv. - **happy birthday sister in law card**5K/yr+2.7%11.1% conv. [**All search terms **](https://flapen.com/research/uk/stationery-office-supplies/sister-in-law-birthday-cards/search-terms)
## **Top sister in law birthday cards 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%3%£3K6%£6K9%£8K12%£11K1101001K10K 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**Me To You Tatty Teddy Amazing Sister-In-Law Cute Luxury Gold Foil Birthday Card 6 X 9 Inches - Official Collection**Me To You**£2.08**4.7★15 rev](https://www.amazon.co.uk/dp/B0GKQ5831B) [2**Cherry Orchard Lovely Sister in Law Birthday Card with Envelope Gorgeous design Cocktail glasses Balloons flowers & hearts - Gold Foil Finish**Cherry Orchard**£2.78**4.9★186 rev](https://www.amazon.co.uk/dp/B0DCK8YHF3) [3**Sister-in-Law Birthday Card - Flowers - 7.5 x 5.25 10002**Card Essentials**£2.38**4.6★434 rev](https://www.amazon.co.uk/dp/B08NYSQ57Q) [4**Piccadilly Greetings Traditional Birthday Card Sister In Law - 9 x 6 inches**Piccadilly Greetings**£2.99**4.6★85 rev](https://www.amazon.co.uk/dp/B07Z3VWKCD) [5**Sister-in-Law Birthday Card - Summer Bouquet with Lovely Verse Inside - Traditional Birthday Card for Women - A5 Size Card with Yellow Envelope**Olivia Samuel**£3.36**4.9★25 rev](https://www.amazon.co.uk/dp/B0GK1N5MZ7)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Happy Birthday Sister-in-law Card - With Love - Elegant Watercolour Floral Bouquet in Vase with Butterfly**Purple Fox**£2.69**1 rev4mo ago](https://www.amazon.co.uk/dp/B0GSCCTGL9) [**Me To You Tatty Teddy Amazing Sister-In-Law Cute Luxury Gold Foil Birthday Card 6 X 9 Inches - Official Collection**Me To You**£2.08**15 rev5mo ago](https://www.amazon.co.uk/dp/B0GKQ5831B) [**Sister-in-Law Birthday Card - Summer Bouquet with Lovely Verse Inside - Traditional Birthday Card for Women - A5 Size Card with Yellow Envelope**Olivia Samuel**£3.36**25 rev6mo ago](https://www.amazon.co.uk/dp/B0GK1N5MZ7) [**Sister-in-Law Birthday Card - Colourful Dahlia Blooms Design - Pretty Greetings card for Women - A5 Size Card with Pink Envelope**Olivia Samuel**£3.34**25 rev6mo ago](https://www.amazon.co.uk/dp/B0GK1T4CMT) [**Sister-in-Law Birthday Card - Floral Gardening Design - Birthday Wishes for Women - A5 Size Card with Fuchsia Pink Envelope**Olivia Samuel**£3.44**25 rev6mo ago](https://www.amazon.co.uk/dp/B0GK1VX93W)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Sister-in-Law Birthday Card - Floral Gardening Design - Birthday Wishes for Women - A5 Size Card with Fuchsia Pink Envelope**Olivia Samuel**£3.44**4.9★**▲ 293%**](https://www.amazon.co.uk/dp/B0GK1VX93W) [**Sister-in-Law Birthday Card - Summer Bouquet with Lovely Verse Inside - Traditional Birthday Card for Women - A5 Size Card with Yellow Envelope**Olivia Samuel**£3.36**4.9★**▲ 287%**](https://www.amazon.co.uk/dp/B0GK1N5MZ7) [**Sister-in-Law Birthday Card - Colourful Dahlia Blooms Design - Pretty Greetings card for Women - A5 Size Card with Pink Envelope**Olivia Samuel**£3.34**4.9★**▲ 268%**](https://www.amazon.co.uk/dp/B0GK1T4CMT) [**Me To You Tatty Teddy Amazing Sister-In-Law Cute Luxury Gold Foil Birthday Card 6 X 9 Inches - Official Collection**Me To You**£2.08**4.7★**▲ 262%**](https://www.amazon.co.uk/dp/B0GKQ5831B) [**Happy Birthday Sister-in-law Card - With Love - Elegant Watercolour Floral Bouquet in Vase with Butterfly**Purple Fox**£2.69**5.0★**▲ 196%**](https://www.amazon.co.uk/dp/B0GSCCTGL9)
**~~View all trending →~~**
## **What buyers say about sister in law birthday cards**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**43%
*“Card is nice quality”*
**Value For Money**28%
*“Great value”*
**Size-Overall**8%
*“Good size”*
**Color**8%
*“Vibrant and colourful”*
**Advertised Vs Actual Product**5%
*“As requested”*
**Design-Overall**4%
*“Lovely quality and design”*
**Shape/Style**2%
*“So elegant”*
**Paper Quality**2%
*“Good quality card with lovely quotes inside”*
### **What buyers complain about **
**Size-Overall**75%
*“small than I wanted”*
**Design-Overall**25%
*“The cad itself was nt very decorative”*
### **Top return reasons **
**Strength**33%
**Display Colors**33%
**Size-Overall**33%
## **Common questions**
- **Is sister in law birthday cards profitable to sell on Amazon United Kingdom?**
- The niche generates £93K/yr across 44 tracked products. 1 of 14 products launched in the last 360 days are still selling. 90-day search growth is -6.6%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the sister in law birthday cards niche?**
- 21 brands and 47 sellers compete. The top 5 products take 37% of clicks and top 5 brands hold 56% of demand.
- **What do buyers complain about in sister in law birthday cards?**
- Top complaints mined from reviews: Size-Overall, Design-Overall. The return rate is 0.1%.
- **When does demand for sister in law birthday cards peak?**
- Demand is steady year-round — the busiest month runs 2.0× the quietest.
- **What does it cost to enter the sister in law birthday cards niche?**
- Listings span £2.08–£5.85; the average listing price is £3.15 (sweet spot $15–$100). The average incumbent carries 257 reviews — the moat a new listing must climb.
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