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Numverify vs Genderize.io

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

APINumverifyUNMONITORED—Genderize.ioNEW—
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 requiredKeyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free key
Rate limitUnpublishedKeyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headers
In directory since2026-07-052026-07-05
operationalpartialdownno data

Numverify vs Genderize.io: common questions

Which is more reliable, Numverify or Genderize.io?

Only Genderize.io is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Numverify and Genderize.io need an API key?

Genderize.io needs no key, while Numverify requires a free API key. If you want to start calling without signup, reach for Genderize.io first.

Can I call Numverify and Genderize.io from the browser?

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

Are Numverify and Genderize.io free for commercial use?

Numverify has unclear commercial terms, and Genderize.io 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.