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Callook.info vs Fixer API

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

APICallook.infoHEALTHY94Fixer APIHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms437448
P95 · ms1156830
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 Fixer API: common questions

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

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus Fixer API at 99.02% 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, Callook.info or Fixer API?

Callook.info has the lower median latency in our checks — Callook.info responds in 437 ms versus Fixer API at 448 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 Fixer API need an API key?

Callook.info needs no key, while Fixer 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 Fixer API from the browser?

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

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

Callook.info has unclear commercial terms, and Fixer 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.