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Free UV Index API vs National Grid ESO

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

APIFree UV Index APINEW—National Grid ESONEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedNESO Open Data Licence (OGL-based); varies per dataset
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free UV Index API vs National Grid ESO: common questions

Which is more reliable, Free UV Index API or National Grid ESO?

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

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

Can I call Free UV Index API and National Grid ESO from the browser?

Yes — both Free UV Index API and National Grid ESO 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 National Grid ESO free for commercial use?

Free UV Index API has unclear commercial terms, and National Grid ESO 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.