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UK Carbon Intensity vs Weather Underground API

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

APIUK Carbon IntensityNEW—Weather Underground APIREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0 (per API docs)Unverified
Free tierFree — no API keyFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

UK Carbon Intensity vs Weather Underground API: common questions

Which is more reliable, UK Carbon Intensity or Weather Underground API?

On our scheduled checks, Weather Underground API leads on measured uptime — UK Carbon Intensity at —% versus Weather Underground API 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 Weather Underground API need an API key?

UK Carbon Intensity needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for UK Carbon Intensity first.

Can I call UK Carbon Intensity and Weather Underground API from the browser?

Yes — both UK Carbon Intensity and Weather Underground 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 UK Carbon Intensity and Weather Underground API free for commercial use?

UK Carbon Intensity allows commercial use on its free tier, and Weather Underground 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.