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Free Dictionary API vs IPDetails.io API

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

APIFree Dictionary APIHEALTHY90IPDetails.io APIHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms674515
P95 · ms21961072
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Dictionary API vs IPDetails.io API: common questions

Which is more reliable, Free Dictionary API or IPDetails.io API?

Both are neck-and-neck — Free Dictionary API and IPDetails.io API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Free Dictionary API or IPDetails.io API?

IPDetails.io API has the lower median latency in our checks — Free Dictionary API responds in 674 ms versus IPDetails.io API at 515 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 Free Dictionary API and IPDetails.io API need an API key?

Neither needs a paid key — Free Dictionary API is callable with no signup, and IPDetails.io API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Free Dictionary API and IPDetails.io API from the browser?

Yes — both Free Dictionary API and IPDetails.io API 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 Free Dictionary API and IPDetails.io API free for commercial use?

Free Dictionary API has unclear commercial terms, and IPDetails.io API 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.