User-Agent模拟器

User-Agent模拟器 is a browser extension that enables switching of User-Agent strings to simulate different devices and browsers. It addresses the need for developers and testers to evaluate how websites render and behave under varied identifiers without changing hardware.

The extension provides a flat interface styled after Apple design principles, featuring intuitive controls and smooth transitions. Users can add, edit, and manage an unlimited number of custom User-Agent configurations. It includes built-in presets for common devices, tablets, phones, desktops, and search engine crawlers. Each entry supports personalized notes for easier identification and organization. Switching occurs with one click, after which a page refresh applies the new identifier.

It is delivered as an extension for Chrome and other Chromium-based browsers, Firefox, and Edge. Installation occurs through the respective official stores. All settings and configurations remain stored locally in the browser with no data collection or transmission to external servers. The tool is available as a free download.

Primary use cases include front-end development testing for cross-device compatibility, SEO optimization by simulating search engine crawlers, troubleshooting browser-specific issues, and experiencing mobile views from a desktop browser. The extension explains that a User-Agent is the identification string sent by a browser to a site, allowing the site to adapt its content accordingly.