Swift Quit enables automatic quitting of macOS apps when closing their windows (clicking the red x). It can be configured to quit when the last window of any app closed, or restricted to a specific list of apps. Additionally, you can exclude apps you dont want to quit automatically.

Some users have reported issues with unwanted closing of windows or other problems so use at your own risk.

https://swiftquit.com

https://swiftquit.com/downloads/Swift%20Quit.zip

https://www.youtube.com/watch?v=WwWF-yekX-U

1. Install via Homebrew "brew install --cask swift-quit"
2. Or download from https://swiftquit.com, unzip, and move app to applications folder.

3. Open finder to applications folder and ctrl+click swift quit.app then select open (You may need to do this twice)
4. When prompted click open system preferences
5. Unlock system preferences by clicking the lock icon
6. Drag Swift Quit.app into the accessibility list and enable it
7. Double click Swift Quit.app
8. Optionally enable start automatically in settings

In order to upgrade to a new version you must first remove the old version from Sytem Preferences => Security & Privacy => Accessibility. Then you can drag the new version in and enable it.