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AQICN vs ColorfulClouds

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

APIAQICNREACHABLE—ColorfulCloudsREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs ColorfulClouds: common questions

Which is more reliable, AQICN or ColorfulClouds?

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

Both ask you to authenticate — AQICN uses an API key and ColorfulClouds 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 ColorfulClouds from the browser?

Neither sends browser-friendly CORS headers reliably, so call AQICN and ColorfulClouds from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are AQICN and ColorfulClouds free for commercial use?

AQICN has unclear commercial terms, and ColorfulClouds 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.