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Callook.info vs OpenSanctions

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

APICallook.infoNEW—OpenSanctionsNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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 OpenSanctions: common questions

Which is more reliable, Callook.info or OpenSanctions?

On our scheduled checks, OpenSanctions leads on measured uptime — Callook.info at —% versus OpenSanctions at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Callook.info and OpenSanctions need an API key?

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

Can I call Callook.info and OpenSanctions from the browser?

Yes — both Callook.info and OpenSanctions 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 OpenSanctions free for commercial use?

Callook.info has unclear commercial terms, and OpenSanctions 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.