Open source user-agent projects
Every project in the registry tagged user-agent, ranked by real GitHub adoption.
UAParser.js - The Essential Web Development Tool for User-Agent Detection. Detect Browsers, OS, Devices, Bots, Apps, AI Crawlers, and more. Run in Browser (clie
A User-Agent spoofer browser extension that is highly configurable
😎 Browser extension that automatically replaces the User-Agent with a randomized one
Frequently asked questions
How many open source user-agent projects are there?
This registry tracks 3 projects tagged user-agent, with 12,516 GitHub stars between them. The most-adopted is ua-parser-js at 10,213 stars.
Are these user-agent projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 3 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which user-agent project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these user-agent projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.