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Voidly vs Open Library

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

APIVoidlyNEW—Open LibraryHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseCC BY 4.0Mixed — mostly open
Free tierFree (keyless data endpoints; Hydra ML endpoints need a key)Unlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

Voidly vs Open Library: common questions

Which is more reliable, Voidly or Open Library?

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

Neither needs a paid key — Voidly 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 Voidly and Open Library from the browser?

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

Voidly allows commercial use on its free tier, 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.