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Groundhog Day API vs Hong Kong Observatory

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

APIGroundhog Day APIHEALTHY98Hong Kong ObservatoryHEALTHY59
Uptime · 30d
Uptime · 90d100%98.9%
Uptime · 30d100%96.7%
P50 · ms2171642
P95 · ms9444276
Authnonenone
CORSyesyes
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

Groundhog Day API vs Hong Kong Observatory: common questions

Which is more reliable, Groundhog Day API or Hong Kong Observatory?

On our scheduled checks, Groundhog Day API leads on measured uptime — Groundhog Day API at 100% versus Hong Kong Observatory at 98.9% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Groundhog Day API or Hong Kong Observatory?

Groundhog Day API has the lower median latency in our checks — Groundhog Day API responds in 217 ms versus Hong Kong Observatory at 1642 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 Groundhog Day API and Hong Kong Observatory need an API key?

Neither needs a paid key — Groundhog Day 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 Groundhog Day API and Hong Kong Observatory from the browser?

Yes — both Groundhog Day API and Hong Kong Observatory 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 Groundhog Day API and Hong Kong Observatory free for commercial use?

Groundhog Day 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.