Hush

Silently quits macOS apps when their last window is closed.

macOS keeps apps running after you close their last window — they linger in Cmd+Tab, waste memory, and do nothing. Hush fixes this quietly.

How it works

Hush lives in your menu bar. When you close an app's last window, Hush detects it within ~1 second and calls terminate() on it automatically. Apps that are intentionally backgrounded (Docker, Dropbox — anything with an .accessory activation policy) are never touched.

Features

• Auto-quits windowless apps within ~1 second
• Never quits background-only apps (Docker, Dropbox, etc.)
• Whitelist — protect apps you want to keep running
• Recently Quit list with "Keep" button to undo
• Launch at Login
• 0% CPU, ~130MB RAM at idle

Requirements

• macOS 13 Ventura or later
• Accessibility permission (for window counting)

Installation

Download

Grab the latest .dmg from Releases.

Build from source

git clone https://github.com/YOUR_USER/hush.git
cd hush
xcodebuild -project Hush.xcodeproj -scheme Hush -destination 'platform=macOS' build

Or open Hush.xcodeproj in Xcode and hit Cmd+R.

First launch

Grant Accessibility permission when prompted, or go to: System Settings → Privacy & Security → Accessibility → add Hush

Why not App Store?

The App Store requires sandboxing, which blocks the Accessibility API Hush depends on to count windows. Direct download only.

Contributing

PRs welcome. Open an issue first for large changes.

License

MIT