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Keen IO vs Phone Number Validator

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

APIKeen IONEW—Phone Number ValidatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Keen IO vs Phone Number Validator: common questions

Which is more reliable, Keen IO or Phone Number Validator?

On our scheduled checks, Phone Number Validator leads on measured uptime — Keen IO at —% versus Phone Number Validator 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 Keen IO and Phone Number Validator need an API key?

Phone Number Validator needs no key, while Keen IO requires a free API key. If you want to start calling without signup, reach for Phone Number Validator first.

Can I call Keen IO and Phone Number Validator from the browser?

Only Phone Number Validator is browser-friendly — it returns CORS headers over HTTPS. Keen IO needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Keen IO and Phone Number Validator free for commercial use?

Keen IO has unclear commercial terms, and Phone Number Validator 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.