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AQICN vs GrünstromIndex

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

APIAQICNREACHABLE100GrünstromIndexHEALTHY53
Uptime · 30d
Uptime · 90d100%73.5%
Uptime · 30d100%73.3%
P50 · ms2241072
P95 · ms6654119
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, AQICN leads on measured uptime — AQICN at 100% versus GrünstromIndex at 73.5% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, AQICN or GrünstromIndex?

AQICN has the lower median latency in our checks — AQICN responds in 224 ms versus GrünstromIndex at 1072 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 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.