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ISRO vs Phone Number Validator

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

APIISRONEW—Phone Number ValidatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ISRO vs Phone Number Validator: common questions

Which is more reliable, ISRO or Phone Number Validator?

On our scheduled checks, Phone Number Validator leads on measured uptime — ISRO 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 ISRO and Phone Number Validator need an API key?

Neither needs a paid key — ISRO is callable with no signup, and Phone Number Validator is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ISRO and Phone Number Validator from the browser?

Yes — both ISRO and Phone Number Validator 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 ISRO and Phone Number Validator free for commercial use?

ISRO 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.