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Bright Sky (DWD) vs Free UV Index API

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

APIBright Sky (DWD)HEALTHY72Free UV Index APIHEALTHY94
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%98.3%
P50 · ms656284
P95 · ms33492611
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierUnlimited, no key, no credit cardFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Bright Sky (DWD) vs Free UV Index API: common questions

Which is more reliable, Bright Sky (DWD) or Free UV Index API?

Both are neck-and-neck — Bright Sky (DWD) and Free UV Index API 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, Bright Sky (DWD) or Free UV Index API?

Free UV Index API has the lower median latency in our checks — Bright Sky (DWD) responds in 656 ms versus Free UV Index API at 284 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 Bright Sky (DWD) and Free UV Index API need an API key?

Neither needs a paid key — Bright Sky (DWD) is callable with no signup, and Free UV Index API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Bright Sky (DWD) and Free UV Index API from the browser?

Yes — both Bright Sky (DWD) and Free UV Index API 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 Bright Sky (DWD) and Free UV Index API free for commercial use?

Bright Sky (DWD) has unclear commercial terms, and Free UV Index 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.