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Open-Meteo vs UK Carbon Intensity

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

APIOpen-MeteoHEALTHY—UK Carbon IntensityNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial usenoyes
Data licenseCC-BY 4.0CC BY 4.0 (per API docs)
Free tier<10,000 calls/day, no signupFree — no API key
Rate limit600/min · 5,000/hourUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open-Meteo vs UK Carbon Intensity: common questions

Which is more reliable, Open-Meteo or UK Carbon Intensity?

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

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

Can I call Open-Meteo and UK Carbon Intensity from the browser?

Yes — both Open-Meteo and UK Carbon Intensity 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 Open-Meteo and UK Carbon Intensity free for commercial use?

Open-Meteo is personal/non-commercial only, and UK Carbon Intensity allows commercial use on its free tier. 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.