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Kaggle vs Open Library

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

APIKaggleUNMONITORED—Open LibraryHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree tier — key may be requiredUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

Kaggle vs Open Library: common questions

Which is more reliable, Kaggle or Open Library?

Only Open Library is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Kaggle and Open Library need an API key?

Open Library needs no key, while Kaggle requires a free API key. If you want to start calling without signup, reach for Open Library first.

Can I call Kaggle and Open Library from the browser?

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

Kaggle has unclear commercial terms, 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.