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GrünstromIndex vs Hong Kong Observatory

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

APIGrünstromIndexHEALTHY53Hong Kong ObservatoryHEALTHY60
Uptime · 30d
Uptime · 90d73.5%100%
Uptime · 30d73.3%100%
P50 · ms10721415
P95 · ms41193670
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedHKO open data (see terms of use)
Free tierFree under fair-use policyFree, no key
Rate limitFair-use (paid tiers for higher limits)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GrünstromIndex vs Hong Kong Observatory: common questions

Which is more reliable, GrünstromIndex or Hong Kong Observatory?

On our scheduled checks, Hong Kong Observatory leads on measured uptime — GrünstromIndex at 73.5% versus Hong Kong Observatory at 100% 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, GrünstromIndex or Hong Kong Observatory?

GrünstromIndex has the lower median latency in our checks — GrünstromIndex responds in 1072 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 GrünstromIndex and Hong Kong Observatory need an API key?

Neither needs a paid key — GrünstromIndex 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 GrünstromIndex and Hong Kong Observatory from the browser?

Yes — both GrünstromIndex 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 GrünstromIndex and Hong Kong Observatory free for commercial use?

GrünstromIndex 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.