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IP Geolocation API vs Open Library

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

APIIP Geolocation APIHEALTHY95Open LibraryHEALTHY73
Uptime · 30d
Uptime · 90d94.1%88.2%
Uptime · 30d90.0%81.7%
P50 · ms2571629
P95 · ms6544878
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

IP Geolocation API vs Open Library: common questions

Which is more reliable, IP Geolocation API or Open Library?

On our scheduled checks, IP Geolocation API leads on measured uptime — IP Geolocation API at 94.1% 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, IP Geolocation API or Open Library?

IP Geolocation API has the lower median latency in our checks — IP Geolocation API responds in 257 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 IP Geolocation API and Open Library need an API key?

Neither needs a paid key — IP Geolocation 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 IP Geolocation API and Open Library from the browser?

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

Are IP Geolocation API and Open Library free for commercial use?

IP Geolocation 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.