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AQICN vs Weather Underground API

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

APIAQICNREACHABLE100Weather Underground APIREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms224104
P95 · ms6651117
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?

Both are neck-and-neck — AQICN and Weather Underground API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, AQICN or Weather Underground API?

Weather Underground API has the lower median latency in our checks — AQICN responds in 224 ms versus Weather Underground API at 104 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.