aid: genderize
name: Genderize.io
description: Free REST API that predicts the gender of a first name with probability scores based on name statistics from millions of users worldwide. Part of the Demografix suite alongside Agify (age prediction) and Nationalize (nationality prediction), sharing a single API key across all three services.
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
url: https://raw.githubusercontent.com/api-evangelist/genderize/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
tags:
  - Gender
  - Names
  - Prediction
  - Demographics
  - Machine Learning
  - Statistics
apis:
  - aid: genderize:genderize-api
    name: Genderize.io API
    description: REST API that accepts first names and returns gender predictions (male, female, or null) with probability scores and sample counts. Supports single names, batch requests of up to 10 names, and country-scoped lookups using ISO 3166-1 alpha-2 country codes.
    image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    humanURL: https://genderize.io
    baseURL: https://api.genderize.io
    tags:
      - Gender
      - Names
      - Prediction
      - Demographics
    properties:
      - type: Documentation
        url: https://genderize.io/documentation/api/reference
      - type: OpenAPI
        url: https://raw.githubusercontent.com/api-evangelist/genderize/refs/heads/main/openapi/openapi.yml
common:
  - type: Website
    url: https://genderize.io
  - type: Documentation
    url: https://genderize.io/documentation
  - type: Pricing
    url: https://genderize.io/pricing
  - type: Plans
    url: plans/genderize-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/genderize-rate-limits.yml
  - type: FinOps
    url: finops/genderize-finops.yml
  - type: Login
    url: https://genderize.io/login
  - type: FAQ
    url: https://genderize.io/faq
  - type: Blog
    url: https://genderize.io/blog
  - type: X
    url: https://x.com/genderizeio
  - type: GitHubOrg
    url: https://github.com/genderize
  - type: LinkedIn
    url: https://www.linkedin.com/company/demografix
  - type: StatusPage
    url: https://status.genderize.io
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com