Read docs Updated 2026-06-16
What is Genderize.io?
Genderize.io is an API that estimates gender based solely on a provided first name.
It supports development tasks that need basic gender inference from names in user data or analytics workflows.
What you can build with Genderize.io
User onboarding personalization
Call the API during signup with a first name to infer gender and pre-select avatars, pronouns, or marketing copy in web or mobile apps.
Customer segmentation analysis
Batch-process lead or user lists to add gender labels and probabilities for marketing dashboards and demographic reporting.
Dataset enrichment in analytics pipelines
Add gender predictions to existing name columns in ETL jobs or data-science notebooks before running statistical models.
Get started with Genderize.io
- 1Open the Genderize.io documentation page
- 2Build a GET request URL with the name query parameter
- 3Send the request over HTTPS (no key needed)
- 4Parse the returned JSON for gender and probability
- 5Add basic error handling for unknown names or limits
Genderize.io: pros & cons
Pros
- +No authentication required
- +Simple single-endpoint design
- +Returns probability alongside prediction
- +HTTPS-only access
Cons
- –Works only on first names
- –Accuracy varies by culture and rarity of name
- –Free usage subject to undocumented rate limits
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A simple API that predicts binary gender and a confidence score from a supplied first name.
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