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Genderize.io vs RandomUser

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

APIGenderize.ioNEW—RandomUserNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (generated data; sample photos governed by UI Faces terms)
Free tierKeyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free keyFree — no key or signup
Rate limitKeyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headersUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Genderize.io vs RandomUser: common questions

Which is more reliable, Genderize.io or RandomUser?

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

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

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

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

Genderize.io has unclear commercial terms, and RandomUser 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.