shipapis
StarSubmit an APISubmit API

Open Library vs Voidly

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

APIOpen LibraryHEALTHY—VoidlyNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseMixed — mostly openCC BY 4.0
Free tierUnlimited within courtesy limitsFree (keyless data endpoints; Hydra ML endpoints need a key)
Rate limitSoft — identified UA appreciatedUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open Library vs Voidly: common questions

Which is more reliable, Open Library or Voidly?

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

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

Can I call Open Library and Voidly from the browser?

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

Open Library has unclear commercial terms, and Voidly 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.