macOS 10.10+
Current release


Memmon remembers what your Mac forgets – A simple deamon that restores your window positions on external monitors.



I am frustrated! Why does my Mac forget all window positions which I moved to a second screen? Every time I unplug the monitor. Every time I close my Macbook lid. Every time I lock my Mac.

Is it macOS 11? Is it the USB-C-to-HDMI converter dongle (notably one made by Apple)? Why do I have to fix things that Apple should have fixed long ago? …

Aren’t there other solutions?

Yes, for example Mjolnir or Hammerspoon (and some comercial ones). But I do not need a full-fledged window manager. Nor the dependencies they rely on. I just need to fix this damn bug.

What is it good for?

First off, Memmon is just 130 lines of code – no dependencies. You can audit it in 5 minutes. Or just build it from scratch if you like (just run make).

Secondly, it does one thing and one thing only: Save and restore window positions whenever your monitor setup changes.


  1. You will need macOS 10.10 or newer.
  2. Grant Memmon the Accessibility privilege. Go to “System Preference” > “Security & Privacy” > “Accessibility” and add Memmon to that list. Otherwise, you can’t move other application windows around and the app has no purpose.
  3. Thats it. The app runs in your status bar.

Hide Status Icon

You can hide the status icon either via the same-titled menu entry. If you do so, the only way to quit the app is by killing the process (with or killall Memmon).

If you like to hide the icon directly on launch, use this app-setting:

# disable status icon completely
defaults write de.relikd.Memmon invisible -bool True
# re-enable status icon
defaults delete de.relikd.Memmon invisible