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Playground
Your current browser is detected the moment you open this page. Switch to "API Testing" to pick a preset or paste any UA string and instantly see the full parse result.
Detecting…
What the playground shows
The playground runs ua-browser directly in your page — nothing is sent to a server. Paste any User-Agent string, or pick a preset from the dropdown, and every field the library parses is displayed side by side:
- Browser, engine, OS, and device type — with the exact version and major version
- CPU architecture and bitness, when Client Hints or hardware signals expose them
- Headless and automation flags — HeadlessChrome, Playwright, Puppeteer, Electron, jsdom, Selenium
- AI crawler and link-preview bot matches — GPTBot, ClaudeBot, PerplexityBot, and 40+ more rules
- Raw environment signals collected live by
getEnvContext()in your own browser
New to the library? Start with Getting Started, check the Support List for everything detected out of the box, or read the API Reference for full signatures.