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ColorfulClouds vs UK Carbon Intensity

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

APIColorfulCloudsREACHABLE—UK Carbon IntensityNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY 4.0 (per API docs)
Free tierFree tier — API key requiredFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ColorfulClouds vs UK Carbon Intensity: common questions

Which is more reliable, ColorfulClouds or UK Carbon Intensity?

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

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

Can I call ColorfulClouds and UK Carbon Intensity from the browser?

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

Are ColorfulClouds and UK Carbon Intensity free for commercial use?

ColorfulClouds 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.