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Open Library vs Wikipedia REST

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

APIOpen LibraryHEALTHY—Wikipedia RESTHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseMixed — mostly openCC BY-SA 4.0
Free tierUnlimited within courtesy limitsUnlimited within etiquette
Rate limitSoft — identified UA appreciated200/sec global courtesy cap
In directory since2026-05-022026-05-09
operationalpartialdownno data

Open Library vs Wikipedia REST: common questions

Which is more reliable, Open Library or Wikipedia REST?

On our scheduled checks, Wikipedia REST leads on measured uptime — Open Library at —% versus Wikipedia REST 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 Open Library and Wikipedia REST need an API key?

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

Can I call Open Library and Wikipedia REST from the browser?

Yes — both Open Library and Wikipedia REST 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 Open Library and Wikipedia REST free for commercial use?

Open Library has unclear commercial terms, and Wikipedia REST allows commercial use on its free tier. 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.