---
title: "Products — sister in law birthday cards - Flapen"
canonical_url: "https://flapen.com/research/uk/stationery-office-supplies/sister-in-law-birthday-cards/products"
last_updated: "2026-07-31T14:30:10.578Z"
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": "Products — sister in law birthday cards - 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")