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Free UV Index API vs Sunrise-Sunset

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

APIFree UV Index APIHEALTHY94Sunrise-SunsetHEALTHY97
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%98.3%
P50 · ms284204
P95 · ms26112206
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree — limits not publishedUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

Free UV Index API vs Sunrise-Sunset: common questions

Which is more reliable, Free UV Index API or Sunrise-Sunset?

Both are neck-and-neck — Free UV Index API and Sunrise-Sunset each measure 99.02% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Free UV Index API or Sunrise-Sunset?

Sunrise-Sunset has the lower median latency in our checks — Free UV Index API responds in 284 ms versus Sunrise-Sunset at 204 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 Free UV Index API and Sunrise-Sunset need an API key?

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

Can I call Free UV Index API and Sunrise-Sunset from the browser?

Yes — both Free UV Index API and Sunrise-Sunset 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 Sunrise-Sunset free for commercial use?

Free UV Index API 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.