shipapis
StarSubmit an APISubmit API

Hong Kong Observatory vs UK Carbon Intensity

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

APIHong Kong ObservatoryNEW—UK Carbon IntensityNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseHKO open data (see terms of use)CC BY 4.0 (per API docs)
Free tierFree, no keyFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hong Kong Observatory vs UK Carbon Intensity: common questions

Which is more reliable, Hong Kong Observatory or UK Carbon Intensity?

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

Neither needs a paid key — Hong Kong Observatory 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 Hong Kong Observatory and UK Carbon Intensity from the browser?

Yes — both Hong Kong Observatory 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 Hong Kong Observatory and UK Carbon Intensity free for commercial use?

Hong Kong Observatory 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.