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Hong Kong Observatory vs Storm Glass Marine Weather

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

APIHong Kong ObservatoryHEALTHY60Storm Glass Marine WeatherHEALTHY98
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1330238
P95 · ms36702729
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseHKO open data (see terms of use)Unverified
Free tierFree, no keyFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hong Kong Observatory vs Storm Glass Marine Weather: common questions

Which is more reliable, Hong Kong Observatory or Storm Glass Marine Weather?

Both are neck-and-neck — Hong Kong Observatory and Storm Glass Marine Weather 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, Hong Kong Observatory or Storm Glass Marine Weather?

Storm Glass Marine Weather has the lower median latency in our checks — Hong Kong Observatory responds in 1330 ms versus Storm Glass Marine Weather at 238 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 Hong Kong Observatory and Storm Glass Marine Weather need an API key?

Hong Kong Observatory needs no key, while Storm Glass Marine Weather requires a free API key. If you want to start calling without signup, reach for Hong Kong Observatory first.

Can I call Hong Kong Observatory and Storm Glass Marine Weather from the browser?

Yes — both Hong Kong Observatory and Storm Glass Marine Weather 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 Storm Glass Marine Weather free for commercial use?

Hong Kong Observatory has unclear commercial terms, and Storm Glass Marine Weather 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.