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Open Library vs Warnely

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

APIOpen LibraryHEALTHY73WarnelyDYING89
Uptime · 30d
Uptime · 90d88.2%90.2%
Uptime · 30d81.7%83.3%
P50 · ms1629334
P95 · ms48781375
Authnonenone
CORSyesno
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 88.2% versus Warnely at 90.2% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Open Library or Warnely?

Warnely has the lower median latency in our checks — Open Library responds in 1629 ms versus Warnely at 334 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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?

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

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.