Genderize.io

API

Free API to estimate gender from first names

Overview

Genderize.io provides a RESTful API for estimating the gender associated with a first name. Its primary GET endpoint accepts single or multiple names (via query params like 'name' or 'names[]') and returns JSON responses with gender predictions, confidence scores, count of data points used, and optional country-specific probabilities (if a country code is specified). Ideal for developers integrating gender estimation into user onboarding, data enrichment, or personalization tools. The API supports batch requests for efficiency and offers tiered pricing for scaling needs.

Example Integration (JavaScript)

script.js JS


fetch('https://genderize.io')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful API
JSON Response Format
Batch Name Processing
Confidence Score Included
Country-Specific Predictions
Freemium Tiers

Frequently Asked Questions

? Is Genderize.io free to use?

Yes, Genderize.io offers a free tier with a limited number of requests per day. Paid plans are available for higher throughput, commercial use, and additional features.

? Does it require an API Key?

Yes, all requests to the Genderize.io API require an API key, which can be obtained by signing up on their official website.

? What is the response format?

The API returns responses in JSON format, including fields like gender, confidence (prediction certainty), count (data points used), and optionally country-specific data if a country code is provided in the request.

Top Alternatives

Gender API Search Google

Tool Info

Pricing Freemium

Category Development

Platform Public API

Pros

⊕ Easy to integrate with simple GET requests
⊕ Accurate predictions for common names
⊕ Supports batch operations for multiple names
⊕ Free tier available for testing and small projects

Cons

⊖ Rate-limited across all tiers
⊖ Requires API key for all requests
⊖ Commercial use requires paid plans
⊖ Lower accuracy for rare or multicultural names