---
title: "Products — 18th birthday card - Flapen"
canonical_url: "https://flapen.com/research/uk/stationery-office-supplies/18th-birthday-card/products"
last_updated: "2026-07-31T10:49:45.520Z"
locale: en
meta:
  description: "Niche score 57/100 · £175K/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 57/100 · £175K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Products — 18th birthday card - Flapen"
---

# **18th birthday card**

**Worth a look**

Shows low returns (0.2%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 36Growth 22Conversion 83Competition 88Returns 99Price range 0Avg price 12Brand share 95Review moat 87Quality gap 24

**Returns**

**Incredible****0.2%**

return rate — above 5% kills the launch gate

**Brand share**

**Incredible****39%**

top-5 brand share — no brand owns this niche

**Competition**

**Great****27%**

top-5 click share — an open shelf

**Review moat**

**Great****250.65**

avg incumbent reviews — the moat a new listing must climb

**Conversion**

**Great****9.0%**

search→purchase rate — share of searches ending in a sale

**Market size**

**Okay****£175K**

£175K/yr · 455K searches

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

**Growth**

**Bad****-5.1%**

90-day search growth — must beat 0% to launch

**Avg price**

**Bad****£4.25**

avg listing price — sweet spot $15–$100

**Price range**

**Bad****£2.19–£11.66**

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")