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Open Library vs OWASP API Security Project

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

APIOpen LibraryHEALTHY—OWASP API Security ProjectNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseMixed — mostly openUnverified
Free tierUnlimited within courtesy limitsFree — limits not published
Rate limitSoft — identified UA appreciatedUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open Library vs OWASP API Security Project: common questions

Which is more reliable, Open Library or OWASP API Security Project?

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

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

Can I call Open Library and OWASP API Security Project from the browser?

Yes — both Open Library and OWASP API Security Project 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 OWASP API Security Project free for commercial use?

Open Library has unclear commercial terms, and OWASP API Security Project 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.