diff --git a/applications/Disk Usage.desktop b/applications/Disk Usage.desktop
deleted file mode 100644
index 1de40546..00000000
--- a/applications/Disk Usage.desktop	
+++ /dev/null
@@ -1,8 +0,0 @@
-[Desktop Entry]
-Version=1.0
-Name=Disk Usage
-Exec=xdg-terminal-exec --app-id=TUI.float -e bash -c "dua i /"
-Terminal=false
-Type=Application
-Icon=disk-usage
-StartupNotify=true
diff --git a/install/omarchy-base.packages b/install/omarchy-base.packages
index bc1fdf09..1981d883 100644
--- a/install/omarchy-base.packages
+++ b/install/omarchy-base.packages
@@ -21,12 +21,12 @@ cups
 cups-filters
 cups-pk-helper
 ddcutil
+disktree-bin
 docker
 docker-buildx
 docker-compose
 dosfstools
 dotnet-runtime
-dua-cli
 evince
 exfatprogs
 expac
diff --git a/manual/21-tuis.md b/manual/21-tuis.md
index c8e88646..4d91769f 100644
--- a/manual/21-tuis.md
+++ b/manual/21-tuis.md
@@ -26,10 +26,6 @@ You start it (or reattach to your existing session) with `Super + Ctrl + Return`
 
 Omarchy has packaged this as _About_ in the Omarchy menu (`Super + Space`).
 
-## Disk Usage
-
-When the drive fills up and you have no idea what's eating it, launch _Disk Usage_ from the app launcher (`Super + Space`). It's [dua](https://github.com/Byron/dua-cli) in interactive mode pointed at the whole file system, so you can walk down into whatever directory is the culprit, sorted biggest first, and delete from right inside it.
-
 ## Cliamp
 
 [Cliamp](https://www.cliamp.stream/) is a retro terminal music player inspired by Winamp 2.x, complete with built-in radio stations for lo-fi beats. Launch it with `Super + Shift + Alt + M`, or from the Omarchy menu under _Apps_. Press `?` for the full keybinding list.
diff --git a/manual/22-guis.md b/manual/22-guis.md
index 56bc701c..2726967d 100644
--- a/manual/22-guis.md
+++ b/manual/22-guis.md
@@ -8,6 +8,10 @@ Plug in a USB stick or an SD card and it's mounted automatically, so it just sho
 
 Double-clicking follows sensible defaults: images open in imv, video in mpv, PDFs in Document Viewer, and plain text in Neovim.
 
+## Disktree
+
+When the drive fills up and you have no idea what's eating it, launch [Disktree](https://github.com/tobi/disktree) from the app launcher (`Super + Space`). It shows a graphical treemap of your home directory. Larger blocks take up more space; walk into directories with the keyboard or mouse, mark what should go, and review your selections before removing anything. Run `disktree --disk` to scan the whole disk.
+
 ## Obsidian
 
 [Obsidian](https://obsidian.md/) is a free and highly extensible note taking application that uses simple Markdown files for storage.
diff --git a/migrations/1791345484.sh b/migrations/1791345484.sh
new file mode 100644
index 00000000..89b0d782
--- /dev/null
+++ b/migrations/1791345484.sh
@@ -0,0 +1,9 @@
+echo "Replace the Disk Usage TUI with Disktree"
+
+omarchy-pkg-add disktree-bin
+omarchy-pkg-drop dua-cli
+
+rm -f "$HOME/.local/share/applications/Disk Usage.desktop"
+if [[ -d $HOME/.local/share/applications ]]; then
+  update-desktop-database "$HOME/.local/share/applications"
+fi
diff --git a/test/shell.d/disktree-migration-test.sh b/test/shell.d/disktree-migration-test.sh
new file mode 100644
index 00000000..3c898127
--- /dev/null
+++ b/test/shell.d/disktree-migration-test.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+mkdir -p "$test_tmp/bin" "$test_tmp/home/.local/share/applications"
+
+for helper in omarchy-pkg-add omarchy-pkg-drop update-desktop-database; do
+  cat > "$test_tmp/bin/$helper" <<'SH'
+#!/bin/bash
+printf '%s %s\n' "${0##*/}" "$*" >> "$TEST_LOG"
+SH
+  chmod +x "$test_tmp/bin/$helper"
+done
+
+launcher="$test_tmp/home/.local/share/applications/Disk Usage.desktop"
+printf '[Desktop Entry]\nExec=dua i /\n' > "$launcher"
+
+for (( attempt = 0; attempt < 2; attempt++ )); do
+  env HOME="$test_tmp/home" OMARCHY_PATH="$ROOT" TEST_LOG="$test_tmp/log" PATH="$test_tmp/bin:$PATH" \
+    bash -euo pipefail "$ROOT/migrations/1791345484.sh"
+  [[ ! -e $launcher ]] || fail "the migration removes the old Disk Usage launcher"
+done
+pass "the Disktree migration removes the old launcher and can run twice"
+
+expected="omarchy-pkg-add disktree-bin
+omarchy-pkg-drop dua-cli
+update-desktop-database $test_tmp/home/.local/share/applications"
+[[ $(cat "$test_tmp/log") == "$expected"$'\n'"$expected" ]] || fail "the migration installs Disktree before removing dua and refreshing launchers"
+pass "the migration installs Disktree before removing dua and refreshing launchers"
+
+rm -r "$test_tmp/home/.local/share/applications"
+env HOME="$test_tmp/home" OMARCHY_PATH="$ROOT" TEST_LOG="$test_tmp/log" PATH="$test_tmp/bin:$PATH" \
+  bash -euo pipefail "$ROOT/migrations/1791345484.sh"
+[[ ! -d $test_tmp/home/.local/share/applications ]] || fail "the migration relies on the packaged Disktree launcher"
+pass "the migration relies on the packaged Disktree launcher when no local launchers exist"