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ISRO vs Phone Number Validator

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

APIISROHEALTHY95Phone Number ValidatorHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms369342
P95 · ms1250706
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?

Both are neck-and-neck — ISRO and Phone Number Validator each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, ISRO or Phone Number Validator?

Phone Number Validator has the lower median latency in our checks — ISRO responds in 369 ms versus Phone Number Validator at 342 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.