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UK Carbon Intensity vs Weatherstack

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

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

UK Carbon Intensity vs Weatherstack: common questions

Which is more reliable, UK Carbon Intensity or Weatherstack?

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

UK Carbon Intensity needs no key, while Weatherstack 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 Weatherstack from the browser?

Only UK Carbon Intensity is browser-friendly — it returns CORS headers over HTTPS. Weatherstack needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are UK Carbon Intensity and Weatherstack free for commercial use?

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