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UUID Generator API vs Open Library

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

APIUUID Generator APINEW—Open LibraryHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree — limits not publishedUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

UUID Generator API vs Open Library: common questions

Which is more reliable, UUID Generator API or Open Library?

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

Neither needs a paid key — UUID Generator API 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 UUID Generator API and Open Library from the browser?

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

Are UUID Generator API and Open Library free for commercial use?

UUID Generator API 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.