100% private codebase context engineering tool
Fully local web app to package your codebase files and diffs into LLM-friendly format

GitContext lets you securely analyze and package local Git repository diffs directly on your machine for quick copy-and-paste into AI Chatbots like ChatGPT, Claude, and others. It runs as a desktop application for macOS, Windows, and Linux, or directly in your browser.

Similar to Repomix or GitIngest, but with key differences:

• Zero servers, zero uploads – everything runs entirely in your browser.
• Supports Git diffs between branches, not just files.
• Generate a file tree with your selected code/diffs for easy LLM ingestion.
• One-click prompt templates tailored for common coding scenarios.

You can download the latest version for your operating system from the GitHub Releases page.

Alternatively, you can use the web version directly at gitcontext.xyz.

GitContext is a privacy-first, browser-based application for analyzing and staging Git repository diffs — all locally.
It uses modern browser APIs like File System Access and IndexedDB to ensure your code never leaves your machine.

Key features:

• Local-only file system access with persistent permissions.
• Real-time Git operations via isomorphic-git, accelerated with web workers + IndexedDB caching.
• UI for diff analysis, file tree navigation, and selective staging.
• Instant token count estimation for LLM context limits.
• Flexible output formats with smart handling of binary files.

As a developer who frequently works with ChatGPT, Claude, and other LLMs, I found existing tools lacking:

• Needed a visual way to pick files and diffs instead of crafting CLI filters.
• Wanted branch-to-branch diffs for scenarios like code reviews and bug fixes.
• Preferred an interactive workflow over command-line arguments.

Passing only relevant context to an LLM significantly improves accuracy — especially in large codebases with overlapping names and structures. See Context Rot for why trimming irrelevant context matters.

• React 18 & Vite
• Electron & electron-builder
• isomorphic-git & LightningFS (for in-browser Git) tiktoken (for token counting)

To run the web app, run:

npm install npm run web:dev

To build the web app, run:

npm run web:build npm run web:preview

To run the Electron app, run:

npm install npm run electron:dev

To build the Electron app, run:

npm run electron:build

To run the tests, run:

npm --workspace src/web run test:e2e