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AQICN vs Free UV Index API

Same instrument, two spec sheets — measured, not claimed.

APIAQICNREACHABLE—Free UV Index APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs Free UV Index API: common questions

Which is more reliable, AQICN or Free UV Index API?

On our scheduled checks, Free UV Index API leads on measured uptime — AQICN at —% versus Free UV Index API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do AQICN and Free UV Index API need an API key?

Free UV Index API needs no key, while AQICN requires a free API key. If you want to start calling without signup, reach for Free UV Index API first.

Can I call AQICN and Free UV Index API from the browser?

Only Free UV Index API is browser-friendly — it returns CORS headers over HTTPS. AQICN needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are AQICN and Free UV Index API free for commercial use?

AQICN has unclear commercial terms, and Free UV Index API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.