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Sunrise-Sunset vs UK Carbon Intensity

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

APISunrise-SunsetNEW—UK Carbon IntensityNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licensen/aCC BY 4.0 (per API docs)
Free tierUnlimited, attribution requestedFree — no API key
Rate limitNo burst trafficUnpublished
In directory since2026-06-222026-07-05
operationalpartialdownno data

Sunrise-Sunset vs UK Carbon Intensity: common questions

Which is more reliable, Sunrise-Sunset or UK Carbon Intensity?

On our scheduled checks, UK Carbon Intensity leads on measured uptime — Sunrise-Sunset 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 Sunrise-Sunset and UK Carbon Intensity need an API key?

Neither needs a paid key — Sunrise-Sunset 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 Sunrise-Sunset and UK Carbon Intensity from the browser?

Yes — both Sunrise-Sunset 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 Sunrise-Sunset and UK Carbon Intensity free for commercial use?

Sunrise-Sunset has unclear commercial terms, 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.