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AQICN vs Weather Underground API

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

APIAQICNREACHABLE—Weather Underground APIREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs Weather Underground API: common questions

Which is more reliable, AQICN or Weather Underground API?

On our scheduled checks, Weather Underground API leads on measured uptime — AQICN at —% versus Weather Underground 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 Weather Underground API need an API key?

Both ask you to authenticate — AQICN uses an API key and Weather Underground API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call AQICN and Weather Underground API from the browser?

Only Weather Underground 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 Weather Underground API free for commercial use?

AQICN has unclear commercial terms, and Weather Underground 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.