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Hong Kong Observatory vs Solematica

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

APIHong Kong ObservatoryHEALTHY60SolematicaHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1415267
P95 · ms36701414
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseHKO open data (see terms of use)Unverified
Free tierFree, no keyFree public /providers endpoint; other endpoints need paid credits
Rate limitUnpublished100 req/window · 99 remaining · resets 900
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hong Kong Observatory vs Solematica: common questions

Which is more reliable, Hong Kong Observatory or Solematica?

Both are neck-and-neck — Hong Kong Observatory and Solematica 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 Solematica?

Solematica has the lower median latency in our checks — Hong Kong Observatory responds in 1415 ms versus Solematica at 267 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 Solematica need an API key?

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

Can I call Hong Kong Observatory and Solematica from the browser?

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

Are Hong Kong Observatory and Solematica free for commercial use?

Hong Kong Observatory has unclear commercial terms, and Solematica 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.