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OpenCorporates vs Open Library

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

APIOpenCorporatesNEW—Open LibraryHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree tier — API key requiredUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

OpenCorporates vs Open Library: common questions

Which is more reliable, OpenCorporates or Open Library?

On our scheduled checks, Open Library leads on measured uptime — OpenCorporates 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 OpenCorporates and Open Library need an API key?

Open Library needs no key, while OpenCorporates requires a free API key. If you want to start calling without signup, reach for Open Library first.

Can I call OpenCorporates and Open Library from the browser?

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

Are OpenCorporates and Open Library free for commercial use?

OpenCorporates 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.