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CheapShark API vs Open Library

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

APICheapShark APIHEALTHY88Open LibraryHEALTHY73
Uptime · 30d
Uptime · 90d99.02%88.2%
Uptime · 30d98.3%81.7%
P50 · ms8041629
P95 · ms24834878
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree — limits not publishedUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

CheapShark API vs Open Library: common questions

Which is more reliable, CheapShark API or Open Library?

On our scheduled checks, CheapShark API leads on measured uptime — CheapShark API at 99.02% versus Open Library at 88.2% 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, CheapShark API or Open Library?

CheapShark API has the lower median latency in our checks — CheapShark API responds in 804 ms versus Open Library at 1629 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 CheapShark API and Open Library need an API key?

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

Can I call CheapShark API and Open Library from the browser?

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

Are CheapShark API and Open Library free for commercial use?

CheapShark API 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.