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Genderize.io API

The Genderize.io API allows developers to accurately predict gender associated with first names, providing probability scores and localized results, ideal for personalized applications.

Developed by Genderize.io

Live API
99.90%Uptime
150msLatency
200Stars
API KeyAuth
NoCredit Card
RESTStyle
1.0Version

Reference

API Endpoints

Endpoints

Available routes, request structures, and code examples.

Predicts gender from a name using query parameter ?name=emily

Endpoint URL
https://api.genderize.io/
Code Example
curl -X GET 'https://api.genderize.io/'
Request Payload
{
  "name": "emily"
}
Expected Response
{
  "name": "emily",
  "count": 225977,
  "gender": "female",
  "probability": 0.98
}
Version:v1
Limit:1000 requests/day

Integration

Quick Start

cURL ExampleREST
curl -X GET "https://api.genderize.io/?name=John&apikey=YOUR_API_KEY"

Docs

Technical Documentation

What this API does

The Genderize.io API enables developers to predict the gender associated with a given first name using a large multilingual dataset. It provides detailed responses including the predicted gender, a probability score indicating confidence, and the count of occurrences in various datasets. The API is designed to enhance user experience by allowing applications to tailor content or services based on gender predictions.

How it works

Developers can utilize the API by sending HTTP GET requests. Each request responds with a JSON object containing the gender prediction, the probability score, and the number of occurrences from the dataset. The API also supports country-localized predictions, allowing for regional specificity based on the provided names.

Authentication

To access the Genderize.io API, developers must register for an API key. This key is required for making requests, but no credit card is needed for obtaining it, allowing for up to 1,000 free requests per day.

Example usage

  • /api?name=John - Returns the predicted gender for the name John, along with probability scores.
  • /api?name[]=Alice&name[]=Bob - Allows batch lookup for names Alice and Bob, returning predictions for both.
  • /api?name=John&country_id=US - Retrieves gender prediction localized for the United States.

Limits

The API allows up to 1,000 free requests per day per API key. Exceeding this limit will require a paid plan.

Ideal use cases

  • Personalizing content based on user names in applications.
  • Enhancing user experience in chatbots and virtual assistants.
  • Improving marketing strategies by targeting demographics.
  • Integrating gender predictions in user forms and surveys.

Examples

Real-World Applications

  • Improving user onboarding flows by predicting gender based on names.
  • Enhancing marketing campaigns by tailoring content to gender demographics.
  • Conducting demographic studies that involve analyzing name-based data.
  • Personalizing application experiences by displaying gender-specific recommendations.

Evaluation

Advantages & Limitations

Advantages
  • ✓ No credit card required for free usage.
  • ✓ Simple REST API that is easy to integrate.
  • ✓ Supports batch lookup for multiple names in one request.
  • ✓ Provides probability and count metrics for prediction confidence.
Limitations
  • ✗ Limited to first name gender prediction only.
  • ✗ Prediction accuracy may vary with uncommon or ambiguous names.
  • ✗ No native support for XML response format.
  • ✗ Free tier limited to 1,000 requests per day.

Support

Frequently Asked Questions

Important Notice

Verify Before You Decide

Last verified · Apr 30, 2026

The details on this page — including pricing, features, and availability — are based on our last review and may not reflect the provider's current offering. Providers update their products frequently, sometimes without prior notice.

What may have changed

Pricing Plans
Features & Limits
Availability
Terms & Policies

Always visit the official provider website to confirm the latest pricing, terms, and feature availability before subscribing or integrating.

Check official site

External Resources

Documentation Official Website Pricing Details Postman Collection

API Specifications

1.0
Pricing Model
Tiered subscription based on usage
Credit Card
Not Required
Response Formats
JSON
Supported Languages
7 Languages
SDK Support
JavaScript, Python, PHP
Rate Limit

1000 requests per day for free tier, higher limits on paid plans

Time to Hello World

Under 10 minutes

Free Tier

1,000 free API requests per day with an API key; no credit card required.

Best For

Developers looking to add gender prediction to apps with minimal hassle.

Not Ideal For

Applications requiring highly accurate or culturally nuanced gender data.

Tags

#genderize#batch#name-prediction#enrichment#free-api#analytics#gender

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