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Zenodo vs Open Library

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

APIZenodoNEW—Open LibraryHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree — limits not publishedUnlimited within courtesy limits
Rate limit30 req/window · 29 remaining · resets 1783516620Soft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

Zenodo vs Open Library: common questions

Which is more reliable, Zenodo or Open Library?

On our scheduled checks, Open Library leads on measured uptime — Zenodo at —% versus Open Library at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Zenodo and Open Library need an API key?

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

Can I call Zenodo and Open Library from the browser?

Yes — both Zenodo and Open Library 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 Zenodo and Open Library free for commercial use?

Zenodo has unclear commercial terms, and Open Library 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.