A desktop application for viewing and analyzing HTTP Archive (HAR) files. Available for macOS, Windows, and Linux. Built with Electron, React, and TypeScript.
Netscope gives you the same network inspection experience as Chrome DevTools, but as a standalone app -- open HAR files, filter and sort requests, inspect headers and timing, and search through raw source data. HAR files often contain sensitive session data like cookies and auth tokens, so everything stays local on your machine.
Every request is displayed in a sortable table with method, status, content type, transfer size, duration, and a color-coded waterfall chart. Click any column header to sort.
Use the content type tabs (XHR, JS, CSS, Img, Font, Doc, Media, Other) to narrow down the list, or type in the search bar to filter by URL.
| Filter by type | Search by URL |
|---|---|
 |
 |
Click any request to open the detail panel. The Headers tab shows general info, request headers, and response headers. Other tabs show payload, response body, cookies, and timing data.
The Timing tab visualizes the request lifecycle -- queueing, stalled, send, wait (TTFB), and receive -- with a horizontal bar chart and raw timing data.
The Source tab shows the raw HAR JSON for any entry. Open the search bar with Cmd+F / Ctrl+F, type a query, and matching text is highlighted inline. Navigate between matches with Enter, Shift+Enter, or Cmd+G / Ctrl+G.
Switch between System, Light, and Dark themes using the toggle in the bottom-right corner. Your preference is saved across sessions.
- Three ways to open files -- Use File > Open (Cmd+O / Ctrl+O), drag-and-drop onto the window, or double-click
.harfiles in your file manager - Multi-window support -- Each HAR file opens in its own window; re-opening an already-open file focuses the existing window
- Disk cache detection -- Responses served from the browser cache are labeled "(from disk cache)" on the status code
- Summary bar -- Aggregate stats at the bottom: total requests, transfer size, resource size, total time, and breakdown by type
- Response preview -- Auto-formatted JSON, rendered base64 images, and raw text display
- Code-signed and notarized -- macOS builds are signed with a Developer ID certificate and notarized by Apple, so Gatekeeper won't block them
Download the latest release for your platform from Releases.
Download the .dmg, open it, and drag Netscope to your Applications folder. The app is code-signed and notarized, so Gatekeeper should not block it.
To set Netscope as the default handler for .har files:
- Right-click any
.harfile in Finder - Choose Get Info
- Under Open with, select Netscope
- Click Change All...
Download the .exe installer and run it. Windows builds are unsigned, so you may see a SmartScreen warning on first launch -- click More info then Run anyway to proceed.
Download the .AppImage or .deb from the Releases page.
For the AppImage, make it executable and run it:
chmod +x Netscope-*.AppImage
./Netscope-*.AppImageFor Debian/Ubuntu, install the .deb directly:
sudo dpkg -i netscope_*.debBuilt with Electron, React, TypeScript, and Vite. See docs/development.md for setup instructions, scripts, and the release process.
MIT