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AQICN vs Groundhog Day API

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

APIAQICNREACHABLE—Groundhog Day APINEW—
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 — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs Groundhog Day API: common questions

Which is more reliable, AQICN or Groundhog Day API?

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

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

Can I call AQICN and Groundhog Day API from the browser?

Only Groundhog Day 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 Groundhog Day API free for commercial use?

AQICN has unclear commercial terms, and Groundhog Day 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.