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AQICN vs GrünstromIndex

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

APIAQICNREACHABLE—GrünstromIndexNEW—
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 under fair-use policy
Rate limitUnpublishedFair-use (paid tiers for higher limits)
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs GrünstromIndex: common questions

Which is more reliable, AQICN or GrünstromIndex?

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

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

Can I call AQICN and GrünstromIndex from the browser?

Only GrünstromIndex 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 GrünstromIndex free for commercial use?

AQICN has unclear commercial terms, and GrünstromIndex 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.