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Open Library vs WHO Global Health Observatory API

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

APIOpen LibraryHEALTHY73WHO Global Health Observatory APIHEALTHY80
Uptime · 30d
Uptime · 90d88.2%88.2%
Uptime · 30d81.7%81.7%
P50 · ms1629872
P95 · ms48782320
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseMixed — mostly openUnverified
Free tierUnlimited within courtesy limitsFree — limits not published
Rate limitSoft — identified UA appreciatedUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open Library vs WHO Global Health Observatory API: common questions

Which is more reliable, Open Library or WHO Global Health Observatory API?

Both are neck-and-neck — Open Library and WHO Global Health Observatory API each measure 88.2% 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, Open Library or WHO Global Health Observatory API?

WHO Global Health Observatory API has the lower median latency in our checks — Open Library responds in 1629 ms versus WHO Global Health Observatory API at 872 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 Open Library and WHO Global Health Observatory API need an API key?

Neither needs a paid key — Open Library is callable with no signup, and WHO Global Health Observatory API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Open Library and WHO Global Health Observatory API from the browser?

Only Open Library is browser-friendly — it returns CORS headers over HTTPS. WHO Global Health Observatory API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Open Library and WHO Global Health Observatory API free for commercial use?

Open Library has unclear commercial terms, and WHO Global Health Observatory API 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.