DiFFY

A desktop app for reviewing git diffs with AI-powered explanations. Compare branches, inspect commits, and get plain-language summaries of code changes — all without leaving your desktop.

Features

• Git diff viewer — browse file-by-file diffs with syntax highlighting
• Branch comparison — compare any two branches or commits in a local repo
• Syntax highlighting — diffs rendered with language-aware coloring
• AI-powered explanations — get instant plain-language summaries of changes using Claude, OpenAI, Gemini, or local models via Ollama / LM Studio

Prerequisites

Node.js 18+

macOS/Linux — via nvm:

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
nvm install 18

Windows — download the installer from nodejs.org.

Verify: node --version

Rust (stable)

macOS/Linux:

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

Windows — download and run rustup-init.exe.

Restart your shell, then verify: rustc --version

Tauri also requires a C compiler and platform libraries. See the Tauri prerequisites guide for OS-specific steps (e.g. xcode-select --install on macOS, build-essential on Ubuntu).

AI provider (optional)

DiFFY supports multiple AI backends. Open Settings in the app and choose your provider:

• Claude — paste an API key from console.anthropic.com
• OpenAI — paste an API key from platform.openai.com
• Gemini — paste an API key from aistudio.google.com
• Ollama / LM Studio — point to your local server (no key needed)

Keys are stored locally and only sent to the selected provider's API.

Development

npm install
npm run tauri dev

The app opens at localhost:1420. Changes to the SvelteKit frontend hot-reload automatically; Rust backend changes trigger a recompile.

Build

npm run tauri build

Produces a platform-native installer in src-tauri/target/release/bundle/.

Tech Stack

• Tauri 2 — Rust-based desktop shell
• SvelteKit 5 — frontend framework
• TypeScript — frontend types
• AI — Claude, OpenAI, Gemini, Ollama, or LM Studio