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Callook.info vs Shields

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

APICallook.infoNEW—ShieldsNEW—
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 Shields: common questions

Which is more reliable, Callook.info or Shields?

On our scheduled checks, Shields leads on measured uptime — Callook.info at —% versus Shields 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 Shields need an API key?

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

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

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

Callook.info has unclear commercial terms, and Shields 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.