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18x25x1 air filter
Skip itBrand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Price range
Incredible$31.33–$68.13cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$46.56avg listing price — sweet spot $15–$100
Conversion
Great11.4%search→purchase rate — share of searches ending in a sale
Returns
Great1.5%return rate — above 5% kills the launch gate
Growth
Good+28.3%90-day search growth — must beat 0% to launch
Market size
Okay$187K$187K/yr · 35K searches
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Competition
Bad74%top-5 click share — a locked-up shelf
Review moat
Bad17,708.38avg incumbent reviews — the moat a new listing must climb
Brand share
Bad98%top-5 brand share — brand-locked demand