---
title: "Trend — spark plug tool - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/spark-plug-tool/trend"
last_updated: "2026-08-09T19:26:02.415Z"
locale: en
meta:
  description: "Niche score 57/100 · $145K/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 · $145K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Trend — spark plug tool - Flapen"
---

# **spark plug tool**

**Worth a look**

Shows no brand lock-in (top 5 brands take 41% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 31Growth 26Conversion 55Competition 78Returns 64Price range 86Avg price 87Brand share 94Review moat 59Quality gap 42

**Brand share**

**Great****41%**

top-5 brand share — no brand owns this niche

**Avg price**

**Great****$19.60**

avg listing price — sweet spot $15–$100

**Price range**

**Great****$4.80–$96.03**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Competition**

**Great****37%**

top-5 click share — an open shelf

**Returns**

**Good****2.4%**

return rate — above 5% kills the launch gate

**Review moat**

**Good****1,126.31**

avg incumbent reviews — the moat a new listing must climb

**Conversion**

**Good****4.5%**

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

**Quality gap**

**Okay****4.5★**

avg incumbent rating — lower means beatable quality

**Market size**

**Okay****$145K**

$145K/yr · 163K searches

**Growth**

**Okay****+1.2%**

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

**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")

## Trend