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RandomUser vs Genderize.io

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

APIRandomUserNEW—Genderize.ioNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (generated data; sample photos governed by UI Faces terms)Unverified
Free tierFree — no key or signupKeyless 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

RandomUser vs Genderize.io: common questions

Which is more reliable, RandomUser or Genderize.io?

On our scheduled checks, Genderize.io leads on measured uptime — RandomUser at —% versus Genderize.io 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 RandomUser and Genderize.io need an API key?

Neither needs a paid key — RandomUser is callable with no signup, and Genderize.io is callable with no signup. Both are quick to prototype with; rate limits still apply.

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

Yes — both RandomUser and Genderize.io 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 RandomUser and Genderize.io free for commercial use?

RandomUser 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.