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Glax Weather API vs Hong Kong Observatory

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

APIGlax Weather APIHEALTHY87Hong Kong ObservatoryHEALTHY60
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms10041415
P95 · ms25343670
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedHKO open data (see terms of use)
Free tierFree — limits not publishedFree, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Glax Weather API vs Hong Kong Observatory: common questions

Which is more reliable, Glax Weather API or Hong Kong Observatory?

Both are neck-and-neck — Glax Weather API and Hong Kong Observatory each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Glax Weather API or Hong Kong Observatory?

Glax Weather API has the lower median latency in our checks — Glax Weather API responds in 1004 ms versus Hong Kong Observatory at 1415 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Glax Weather API and Hong Kong Observatory need an API key?

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

Can I call Glax Weather API and Hong Kong Observatory from the browser?

Only Hong Kong Observatory is browser-friendly — it returns CORS headers over HTTPS. Glax Weather API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Glax Weather API and Hong Kong Observatory free for commercial use?

Glax Weather API has unclear commercial terms, and Hong Kong Observatory 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.