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17.5x21x1 air filter
Skip itBrand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.7%return rate — above 5% kills the launch gate
Price range
Incredible$38.40–$75.13cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$49.40avg listing price — sweet spot $15–$100
Conversion
Great7.5%search→purchase rate — share of searches ending in a sale
Growth
Good+24.4%90-day search growth — must beat 0% to launch
Review moat
Okay2,358.88avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Market size
Bad$31K$31K/yr · 8K searches
Competition
Bad91%top-5 click share — a locked-up shelf
Brand share
Bad97%top-5 brand share — brand-locked demand