Codiff
A free, open-source local Git diff viewer with an optional AI-generated plain-English walkthrough of your changes.
🔗 Visit Codiff
Description
Codiff is a free, fast little app that shows you exactly what changed in your code before you commit it — like a spell-checker for your code changes, except it can also write you a plain-English summary of what you just did.
Codiff is an open-source (MIT-licensed) local Git diff viewer for macOS and Linux, with split and unified diff modes, inline review comments exportable to GitHub pull requests and GitLab merge requests, and an "LLM Walkthrough" CLI mode (codiff -w) that generates a narrative commit explanation using a pluggable AI backend such as Claude, Codex, OpenCode or Pi. The project has around 1,200 GitHub stars, confirmed directly on the repository page.
💬 Our review
The short version: Codiff is a genuinely free, open-source alternative to paid Git GUI clients, with an AI walkthrough feature bolted on for people who want a plain-English summary of their own diff.
Compared to GitKraken, a paid, polished, cross-platform client including Windows support, and VS Code's built-in diff view, which is free but less dedicated and slower on large diffs, Codiff's local-first, no-telemetry approach plus its free MIT license is the clear differentiator. The main gap is the lack of Windows support, which rules it out for anyone not on Mac or Linux.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Free and open source under the MIT license.
Pros
Completely free and open source (MIT), around 1,200 GitHub stars
Fast, local-first — no data leaves your machine
LLM walkthrough mode explains a diff in plain English via CLI
Inline review comments exportable straight to GitHub PRs and GitLab MRs
Cons
macOS and Linux only — no native Windows support
LLM walkthrough feature depends on an external AI backend
Smaller community than mainstream tools like GitKraken