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UK Carbon Intensity vs wttr.in

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

APIUK Carbon IntensityNEW—wttr.inNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0 (per API docs)Unverified
Free tierFree — no API keyFree — limits not published
Rate limitUnpublishedUnpublished (informal per-IP throttling)
In directory since2026-07-052026-07-05
operationalpartialdownno data

UK Carbon Intensity vs wttr.in: common questions

Which is more reliable, UK Carbon Intensity or wttr.in?

On our scheduled checks, wttr.in leads on measured uptime — UK Carbon Intensity at —% versus wttr.in 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 UK Carbon Intensity and wttr.in need an API key?

Neither needs a paid key — UK Carbon Intensity is callable with no signup, and wttr.in is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call UK Carbon Intensity and wttr.in from the browser?

Yes — both UK Carbon Intensity and wttr.in 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 UK Carbon Intensity and wttr.in free for commercial use?

UK Carbon Intensity allows commercial use on its free tier, and wttr.in 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.