> ## Documentation Index > Fetch the complete documentation index at: https://docs.requestly.com/llms.txt > Use this file to discover all available pages before exploring further. # How is the Browser Extension Different from the Desktop App Requestly is available as both a **browser extension** and a **desktop application**. While both platforms offer a similar set of features, their capabilities differ slightly to address platform-specific limitations and better cater to distinct use cases. The **browser extension** is comparatively a **lighter tool** that runs directly within the browsers and is ideal for **browser-focused workflows**. The **desktop app** is designed to provide more control over network traffic across the **entire system**, including apps outside the browser. This comparison outlines functional differences to help you choose the right setup for your use case. ## Platform & Browser Support **Browser Extension -** Supports all major web browsers, including all Chromium-based browsers, Firefox, and Safari (limited support) **Desktop App -** Supports all browsers and any app making network requests. like desktop apps, backend services, mobile devices, etc. > πŸ“Ž The extension runs inside the browser environment. The desktop app operates system-wide and works with any browser, application or even hardware devices like smartphones etc. ## HTTP Interception > πŸ”§ Use the desktop app if you need to work with network traffic beyond the browser, such as from curl, Postman, mobile devices, or backend services. | **Feature** | **Browser Extension** | **Desktop App** | | ---------------------------------- | --------------------- | --------------- | | Browser Interception | βœ… | βœ… | | System-wide Proxy | ❌ | βœ… | | Mobile App Interception | ❌ | βœ… | | Locally Installed App Interception | ❌ | βœ… | ## HTTP Rules | **Feature** | **Browser Extention** | **Desktop App** | | --------------------------- | ------------------------------------------------------ | --------------- | | HTTP Rules | βœ…Β \[Limitations below]πŸ‘‡ | βœ… | | Delay Rule max delay | 5000ms (Fetch/ XHR requests) 10000ms (Other resources) | Unlimited | | Redirect to local file | ❌ | βœ… | | Serve local file Response | ❌ | βœ… | | Modify HTML/JS/CSS Response | ❌ | βœ… | | Map Local | ❌ | βœ… | | Map Remote | βœ… | βœ… | > πŸ’‘ The extension works within the limitations of browser APIs. Features like serving local files or modifying HTML/CSS content are only supported in the desktop app due to broader system access. ## Mocking & Debugging | **Feature** | **Browser Extension** | **Desktop App** | | ---------------- | --------------------- | --------------- | | File Server | βœ… | βœ… | | Bulk Mocking | ❌ | βœ… | | Session Book | βœ… | ❌ | | Network Sessions | ❌ | βœ… | > πŸ“Œ Tip: Use Desktop App when mocking multiple endpoints or importing HAR files. ## Workspaces & Import/Export | **Feature** | **Browser Extension** | **Desktop App** | | ------------------------ | --------------------- | --------------- | | Local Workspace (Beta) | 🚧 (Coming Soon) | βœ… | | Import / Export HAR file | 🚧 (Coming Soon) | βœ… | ## Visibility of Executed Rules The way Requestly shows rule executions varies between the browser extension and desktop app, tailored to their respective environments: 1\. A **pop-up notification** shows which rule was triggered when browsing. 2\. Requestly Extension’s **icon turns green** in the extension toolbar. 3\. The **extension popup panel** also lists recently executed rules, making it easy to confirm if a rule applied. The **rules table** visually highlights which rules were applied by turning the corresponding request rows **green**.