Why diffcat?

There are good diff tools already: delta, difftastic, lazygit, tig. diffcat is narrower on purpose, its main focus is on making the git diff view experience delighful.

Features

• TUI with native vim keybindings
• GitHub-style diffs: green/red tints, line-number gutters, syntax highlighting, surrounding-line expansion
• Unified or side-by-side view (s), light/dark theme (t)
• Auto-detected base, or any ref via --base
• Commit history view with per-commit diffs
• Stats dashboard (S): contribution calendar, per-author ranking, activity charts, streaks, and a human-vs-AI split that names each agent

Demo

Install

Prebuilt binary (no Go required). Download the tarball for your platform from the latest release (darwin-amd64, darwin-arm64, linux-amd64, linux-arm64), then:

tar -xzf diffcat-*-darwin-arm64.tar.gz   # match the file you downloaded
sudo mv diffcat /usr/local/bin/

With Go (1.25+):

go install github.com/trebaud/diffcat/cmd/diffcat@latest

From source:

git clone https://github.com/trebaud/diffcat.git && cd diffcat && ./scripts/install.sh

Commands

diffcat [path] [--base <ref>]         # launch the TUI (path defaults to .)
diffcat files [path] [--base <ref>]   # print the changed-file list, non-interactive

--base, -b <ref> overrides the base. It accepts any git ref: a branch, remote branch, tag, or commit.

diffcat -b develop
diffcat -b origin/main
diffcat -b v1.2.0
diffcat -b 3f9a1c2

Without --base, the base is auto-detected: origin/HEAD, else master, else main.

License

MIT, see LICENSE. Built on Bubble Tea, Lip Gloss, Cobra, and Chroma.