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AQICN vs Sunrise-Sunset

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

APIAQICNON SCHEDULE—Sunrise-SunsetNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree tier — API key requiredUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

AQICN vs Sunrise-Sunset: common questions

Which is more reliable, AQICN or Sunrise-Sunset?

Only Sunrise-Sunset is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do AQICN and Sunrise-Sunset need an API key?

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

Can I call AQICN and Sunrise-Sunset from the browser?

Only Sunrise-Sunset 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 Sunrise-Sunset free for commercial use?

AQICN has unclear commercial terms, and Sunrise-Sunset 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.