uaBrowserBrowser Detection Beyond UA Strings

UA strings lie. ua-browser combines hardware signals and Client Hints to stay accurate when the UA string can't be trusted. Zero dependencies. Browser and Node.js.

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Hardware Signal Detection

WebGL renderer, CSS safe-area-inset, device pixel ratio, Vibration API — correctly identifies phones in desktop mode and distinguishes Apple Silicon from Intel Mac.

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Client Hints Support

In the browser, getHighEntropyValues returns real version and arch data. Server-side, parseHeaders reads Sec-CH-UA-* headers for precise detection without guesswork.

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AI Bot Recognition

40+ built-in bot rules covering GPTBot, ClaudeBot, PerplexityBot, CCBot, and messaging link-preview bots (Slack, Discord, Telegram, WhatsApp).

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Headless Browser Detection

Identifies HeadlessChrome, Playwright, Puppeteer, Electron, jsdom, and Selenium environments to block non-human traffic.

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Tree-shakeable

All features are named exports. Import only what you need — Vite, Rollup, and webpack 5+ eliminate unused code automatically.

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Zero Dependencies · Tiny Bundle

No runtime dependencies. Tiny after gzip. Works in browser and Node.js. Full TypeScript support with precise literal union types.