diff --git a/README.md b/README.md
index 2638b6d4..6f06e635 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,13 @@ just dev          # start Mark
 just dev staged   # start Staged
 ```
 
+## App Installation
+
+For end-user installs:
+
+- Mark (macOS): `curl -fsSL https://raw.githubusercontent.com/block/builderbot/main/apps/mark/install.sh | bash`
+- Staged: no standalone installer yet; run from source with `just dev staged` or build with `just app staged build`
+
 ## Command Guide
 
 The root `justfile` supports both styles:
diff --git a/apps/mark/README.md b/apps/mark/README.md
index 5fd6725e..c6dfd930 100644
--- a/apps/mark/README.md
+++ b/apps/mark/README.md
@@ -19,7 +19,7 @@ A desktop app for reviewing git changes, managing branches, and running AI codin
 Install with a single command:
 
 ```bash
-curl -fsSL https://raw.githubusercontent.com/block/builderbot/main/mark/install.sh | bash
+curl -fsSL https://raw.githubusercontent.com/block/builderbot/main/apps/mark/install.sh | bash
 ```
 
 The installer will:
diff --git a/apps/mark/install.sh b/apps/mark/install.sh
new file mode 100755
index 00000000..fd204922
--- /dev/null
+++ b/apps/mark/install.sh
@@ -0,0 +1,150 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+log() {
+    printf '[mark-install] %s\n' "$1"
+}
+
+require_cmd() {
+    if ! command -v "$1" >/dev/null 2>&1; then
+        printf 'Error: required command not found: %s\n' "$1" >&2
+        exit 1
+    fi
+}
+
+copy_app() {
+    local source_app="$1"
+    local destination_app="$2"
+
+    rm_with_optional_sudo "$destination_app"
+    mkdir_with_optional_sudo "$(dirname "$destination_app")"
+    copy_with_optional_sudo "$source_app" "$destination_app"
+}
+
+install_cli() {
+    local source_cli="$1"
+    local destination_cli="$2"
+
+    mkdir_with_optional_sudo "$(dirname "$destination_cli")"
+    install_with_optional_sudo "$source_cli" "$destination_cli"
+}
+
+mkdir_with_optional_sudo() {
+    local dir="$1"
+    mkdir -p "$dir" 2>/dev/null || sudo mkdir -p "$dir"
+}
+
+rm_with_optional_sudo() {
+    local target="$1"
+    if [ -e "$target" ]; then
+        rm -rf "$target" 2>/dev/null || sudo rm -rf "$target"
+    fi
+}
+
+copy_with_optional_sudo() {
+    local source="$1"
+    local destination="$2"
+    cp -R "$source" "$destination" 2>/dev/null || sudo cp -R "$source" "$destination"
+}
+
+install_with_optional_sudo() {
+    local source="$1"
+    local destination="$2"
+    install -m 0755 "$source" "$destination" 2>/dev/null || sudo install -m 0755 "$source" "$destination"
+}
+
+if [ "$(uname -s)" != "Darwin" ]; then
+    echo "Error: mark installer currently supports macOS only." >&2
+    exit 1
+fi
+
+require_cmd git
+require_cmd bash
+
+REPO_URL="${MARK_REPO_URL:-https://github.com/block/builderbot.git}"
+REPO_REF="${MARK_REPO_REF:-main}"
+SOURCE_DIR="${MARK_SOURCE_DIR:-}"
+INSTALL_DIR="${MARK_INSTALL_DIR:-/Applications}"
+CLI_DIR="${MARK_CLI_DIR:-/usr/local/bin}"
+WORK_DIR="${MARK_WORK_DIR:-}"
+KEEP_WORK_DIR="${MARK_KEEP_WORK_DIR:-0}"
+
+TEMP_DIR=""
+if [ -z "$SOURCE_DIR" ]; then
+    if [ -n "$WORK_DIR" ]; then
+        mkdir -p "$WORK_DIR"
+        TEMP_DIR="$(cd "$WORK_DIR" && pwd)/builderbot-mark-install"
+        rm -rf "$TEMP_DIR"
+    else
+        TEMP_DIR="$(mktemp -d "${TMPDIR:-/tmp}/builderbot-mark-install.XXXXXX")"
+    fi
+
+    cleanup() {
+        if [ "$KEEP_WORK_DIR" = "1" ] || [ -z "$TEMP_DIR" ]; then
+            return
+        fi
+        rm -rf "$TEMP_DIR" 2>/dev/null || sudo rm -rf "$TEMP_DIR" || true
+    }
+    trap cleanup EXIT
+
+    log "cloning builderbot (${REPO_REF})"
+    git clone --depth 1 --branch "$REPO_REF" "$REPO_URL" "$TEMP_DIR"
+    SOURCE_DIR="$TEMP_DIR"
+else
+    SOURCE_DIR="$(cd "$SOURCE_DIR" && pwd)"
+    log "using local source: $SOURCE_DIR"
+fi
+
+if [ ! -f "$SOURCE_DIR/bin/activate-hermit" ]; then
+    echo "Error: could not find hermit activation script at $SOURCE_DIR/bin/activate-hermit" >&2
+    exit 1
+fi
+
+if [ ! -f "$SOURCE_DIR/scripts/mark" ]; then
+    echo "Error: could not find mark launcher script at $SOURCE_DIR/scripts/mark" >&2
+    exit 1
+fi
+
+if [ ! -f "$SOURCE_DIR/apps/mark/justfile" ]; then
+    echo "Error: could not find Mark app at $SOURCE_DIR/apps/mark" >&2
+    exit 1
+fi
+
+cd "$SOURCE_DIR"
+
+log "activating hermit"
+# shellcheck disable=SC1091
+source ./bin/activate-hermit
+
+require_cmd just
+require_cmd pnpm
+require_cmd lefthook
+
+log "installing git hooks"
+lefthook install
+
+log "installing dependencies"
+pnpm install
+
+log "building Mark"
+just app mark build
+
+APP_SOURCE="$SOURCE_DIR/apps/mark/src-tauri/target/release/bundle/macos/Mark.app"
+CLI_SOURCE="$SOURCE_DIR/scripts/mark"
+APP_DEST="$INSTALL_DIR/Mark.app"
+CLI_DEST="$CLI_DIR/mark"
+
+if [ ! -d "$APP_SOURCE" ]; then
+    echo "Error: Mark.app was not produced at $APP_SOURCE" >&2
+    exit 1
+fi
+
+log "installing app to $APP_DEST"
+copy_app "$APP_SOURCE" "$APP_DEST"
+
+log "installing CLI to $CLI_DEST"
+install_cli "$CLI_SOURCE" "$CLI_DEST"
+
+log "installation complete"
+printf 'Run `%s` to launch Mark from your current directory.\n' "$(basename "$CLI_DEST")"