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Free UV Index API vs GrünstromIndex

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

APIFree UV Index APINEW—GrünstromIndexNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree under fair-use policy
Rate limitUnpublishedFair-use (paid tiers for higher limits)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free UV Index API vs GrünstromIndex: common questions

Which is more reliable, Free UV Index API or GrünstromIndex?

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

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

Can I call Free UV Index API and GrünstromIndex from the browser?

Yes — both Free UV Index API and GrünstromIndex 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 GrünstromIndex free for commercial use?

Free UV Index API has unclear commercial terms, and GrünstromIndex 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.