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UK Carbon Intensity vs Sunrise-Sunset

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

APIUK Carbon IntensityNEW—Sunrise-SunsetNEW—
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)n/a
Free tierFree — no API keyUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

UK Carbon Intensity vs Sunrise-Sunset: common questions

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

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

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

Can I call UK Carbon Intensity and Sunrise-Sunset from the browser?

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

UK Carbon Intensity allows commercial use on its free tier, and Sunrise-Sunset 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.