A blazing-fast terminal diff viewer with split panes, syntax highlighting, and word-level change detection.
Pipe any unified diff into asd and get a rich, navigable TUI for reviewing changes.
brew install vdeantoni/tap/asd
Download a binary from the latest GitHub release.
# Review git changes
git diff | asd
# Compare two files
diff -u old.txt new.txt | asd
# Run without args for a built-in demo
asd
| Key |
Action |
a |
Previous file(s) |
d |
Next file(s) |
←↑↓→ |
Focus pane in direction |
Tab |
Cycle focus through panes |
0–9 |
Focus pane by index |
| Key |
Action |
Space |
Page down |
Shift+↑ |
Scroll up |
Shift+↓ |
Scroll down |
Shift+← |
Scroll left |
Shift+→ |
Scroll right |
| Key |
Action |
s |
Auto-split (BFS rotation across panes) |
S |
Split focused pane (auto-detect direction) |
v |
Split focused pane vertically (left | right) |
h |
Split focused pane horizontally (top / bottom) |
m |
Undo last split (merge) |
M |
Merge focused pane with sibling (if sibling is a single pane) |
- |
Shrink focused pane |
= |
Grow focused pane |
Split direction is determined by the pane's visual aspect ratio — taller panes get a horizontal cut, wider panes get a vertical cut.
| Key |
Action |
x |
Hide focused file (skip during navigation/splitting) |
c |
Copy focused file's diff to clipboard |
o |
Open focused file in $EDITOR |
f |
Open file list overlay |
r |
Reset to initial state |
| Key |
Action |
↑ / ↓ |
Navigate file list |
x |
Toggle file visibility |
Shift+↑ / Shift+↓ |
Reorder files |
Enter |
Go to selected file |
f / Esc |
Close overlay |
| Key |
Action |
q / Esc / Ctrl+C |
Quit |
- Split panes — BFS spiral splitting that rotates through panes, or manual v/h splits with resizable ratios
- Syntax highlighting — 250+ languages powered by syntect + two-face (TypeScript, TSX, Rust, Go, and more)
- Word-level diff — changed words within modified lines are emphasized with distinct colors
- Merge & undo — undo splits or merge adjacent panes back together
- Resize panes — shrink/grow focused pane with
-/=
- Copy to clipboard — copy a file's diff to the system clipboard
- Open in editor — jump to a file in
$EDITOR directly from the diff view
- Hide/show files — focus on what matters, hide the rest
- File list overlay — browse, reorder, and toggle file visibility
- Sliding window — A/D shifts all panes simultaneously across files
- Demo mode — run
asd with no input for a built-in poetry diff demo
MIT
