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Callook.info vs Stytch

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

APICallook.infoNEW—StytchNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs Stytch: common questions

Which is more reliable, Callook.info or Stytch?

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

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

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

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

Are Callook.info and Stytch free for commercial use?

Callook.info has unclear commercial terms, and Stytch 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.