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Diffbot API vs Phone Number Validator

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

APIDiffbot APINEW—Phone Number ValidatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Diffbot API vs Phone Number Validator: common questions

Which is more reliable, Diffbot API or Phone Number Validator?

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

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

Can I call Diffbot API and Phone Number Validator from the browser?

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

Diffbot API 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.