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Hong Kong Observatory vs National Grid ESO

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

APIHong Kong ObservatoryNEW—National Grid ESONEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseHKO open data (see terms of use)NESO Open Data Licence (OGL-based); varies per dataset
Free tierFree, no keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hong Kong Observatory vs National Grid ESO: common questions

Which is more reliable, Hong Kong Observatory or National Grid ESO?

On our scheduled checks, National Grid ESO leads on measured uptime — Hong Kong Observatory at —% versus National Grid ESO 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 National Grid ESO need an API key?

Neither needs a paid key — Hong Kong Observatory is callable with no signup, and National Grid ESO is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Hong Kong Observatory and National Grid ESO from the browser?

Yes — both Hong Kong Observatory and National Grid ESO 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 National Grid ESO free for commercial use?

Hong Kong Observatory has unclear commercial terms, and National Grid ESO 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.