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Callook.info vs ValidEU API

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

APICallook.infoHEALTHY94ValidEU APIHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms437273
P95 · ms1156786
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs ValidEU API: common questions

Which is more reliable, Callook.info or ValidEU API?

Both are neck-and-neck — Callook.info and ValidEU 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 ValidEU API?

ValidEU API has the lower median latency in our checks — Callook.info responds in 437 ms versus ValidEU API at 273 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 ValidEU API need an API key?

Callook.info needs no key, while ValidEU API requires a free API key. If you want to start calling without signup, reach for Callook.info first.

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

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

Are Callook.info and ValidEU API free for commercial use?

Callook.info has unclear commercial terms, and ValidEU 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.