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Open Library vs Warnely

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

APIOpen LibraryHEALTHY—WarnelyNEW—
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 appreciated100 req/window · 99 remaining · resets 60
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open Library vs Warnely: common questions

Which is more reliable, Open Library or Warnely?

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

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

Can I call Open Library and Warnely from the browser?

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

Open Library has unclear commercial terms, and Warnely 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.