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Genderize.io

Guess likely gender from a first name, with a confidence score

🔧 Developer ToolsHEALTHYchecked 11h ago
AUTH NONECORS ✓AGENT ✓HTTPS ✓COMMERCIAL ?

Send a first name and get back a predicted gender plus a probability and the sample size behind it. No key is needed for light use, and response headers report your remaining quota. Part of the same family as Nationalize.

68HOW IT'S SCORED ⓘ
▶ Run liveDocs ↗
Status badge · for your READMEshipapis health badge: 68 · healthy
Uptime history
49.4%90 days
58.6%30 days
287P50 · ms
1060P95 · ms
operationalpartialdownno data
Response time · last 48 checks
Fastest 122 ms, slowest 808 ms, most recent 126 ms.
Live response samplecaptured by our last successful check
GET https://api.genderize.io/?name=luc

{
  "count": 114766,
  "name": "luc",
  "gender": "male",
  "probability": 0.99
}
Call itcurl · fetch · python
curl "https://api.genderize.io/?name=luc"
const res = await fetch("https://api.genderize.io/?name=luc");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://api.genderize.io/?name=luc")
print(res.json())
Endpoints · 3HealthyFULL DOCS ↗
Monitored path responding — GET /?name=luc287 mschecked 11h ago
GET/?name=lucPROBED

Guess likely gender from a first name, with a confidence score

GET/?limit=5

Genderize.io root or index route.

GET/?page=1

Genderize.io root or index route.

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.

Genderize.io: common questions

Is Genderize.io free to use?

Yes — Genderize.io is a free developer tools API. Free tier: Keyless usage limited (x-rate-limit-limit: 25 observed); 2,500 names/mo with a free key. Whether the free tier allows commercial use is unclear — check the provider docs.

Does Genderize.io need an API key?

No — Genderize.io needs no API key or signup. You can call it straight away; rate limits still apply (Keyless cap 25 per x-rate-limit-limit header; remaining/reset exposed in response headers).

Can I call Genderize.io from the browser?

Yes — Genderize.io returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.

Is Genderize.io up right now?

As of our last scheduled check, Genderize.io is healthy with 49.4% uptime over 90 days and a 287 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.