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Free UV Index API vs Hong Kong Observatory

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

APIFree UV Index APINEW—Hong Kong ObservatoryNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedHKO open data (see terms of use)
Free tierFree — limits not publishedFree, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free UV Index API vs Hong Kong Observatory: common questions

Which is more reliable, Free UV Index API or Hong Kong Observatory?

On our scheduled checks, Hong Kong Observatory leads on measured uptime — Free UV Index API at —% versus Hong Kong Observatory 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 Free UV Index API and Hong Kong Observatory need an API key?

Neither needs a paid key — Free UV Index API is callable with no signup, and Hong Kong Observatory is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Free UV Index API and Hong Kong Observatory from the browser?

Yes — both Free UV Index API and Hong Kong Observatory send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Free UV Index API and Hong Kong Observatory free for commercial use?

Free UV Index API has unclear commercial terms, and Hong Kong Observatory 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.