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19x19x1 air filter
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Great1.1%return rate — above 5% kills the launch gate
Avg price
Great$49.34avg listing price — sweet spot $15–$100
Price range
Great$11.60–$101.36cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great7.7%search→purchase rate — share of searches ending in a sale
Growth
Good+47.2%90-day search growth — must beat 0% to launch
Review moat
Okay3,173.78avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Market size
Bad$45K$45K/yr · 12K searches
Competition
Bad87%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand