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Callook.info vs Free Dictionary API

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

APICallook.infoHEALTHY94Free Dictionary APIHEALTHY90
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms437674
P95 · ms11562196
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs Free Dictionary API: common questions

Which is more reliable, Callook.info or Free Dictionary API?

Both are neck-and-neck — Callook.info and Free Dictionary 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, Callook.info or Free Dictionary API?

Callook.info has the lower median latency in our checks — Callook.info responds in 437 ms versus Free Dictionary API at 674 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 Callook.info and Free Dictionary API need an API key?

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

Can I call Callook.info and Free Dictionary API from the browser?

Yes — both Callook.info and Free Dictionary 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 Callook.info and Free Dictionary API free for commercial use?

Callook.info has unclear commercial terms, and Free Dictionary 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.