🐱 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.

• 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); a theme picker (t) with 8 color themes, light/dark, file-type icons, and a reduce-motion toggle
• 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

commit details modal and the whole-repo stats dashboard

fuzzy find and in-diff search

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

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.

Press t in the TUI for the theme picker: arrow through the themes with a live preview, T flips light/dark, i cycles the file-type icon set, m toggles animations, ↵ keeps the choice (persisted), esc reverts. Your selection is saved to ~/.config/diffcat/config.json and restored on the next run.

You can also set appearance up front, via flags or environment variables:

diffcat --theme dracula # github (default), dracula, nord, catppuccin,
 # gruvbox, tokyonight, solarized, monochrome
diffcat --icons nerd # ascii (default), unicode, nerd (needs a Nerd Font)
diffcat --no-anim # freeze the nyan cat, pulse, and shimmer
DIFFCAT_THEME=nord diffcat # env equivalents: DIFFCAT_THEME, DIFFCAT_ICONS,
 # DIFFCAT_NO_ANIM

Precedence is flag → environment → saved config → terminal auto-detection. NO_COLOR is honored: when set, diffcat forces the monochrome theme and freezes all motion.

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