Mission Control, a macOS feature, offers multiple desktops. You can switch between desktops with a keyboard shortcut, by swiping on your trackpad, or by opening Mission Control itself. It’s great for multitasking—you can put different parts of your workflow in different places—but it’s easy to forget the feature is there. Part of the problem: You can’t tell at a glance which desktop you’re currently using.

The free and open-source application Spaceman solves this. This application sits in the menu bar and shows you squares that represent your virtual desktops: your current desktop is black, the others are gray. You can optionally add numbers or even names to each desktop for more context.

To get started, download the latest release from Github and install it. Launch the application and it will open in your menu bar. I recommend moving it to the right side by holding down the Command key and dragging it, but the placement is of course up to you.

This application not only shows your Mission Control desktops, but also any applications you have open in full screen. This way you can keep track of multiple full screen windows, if you do that often.