What it shows
- Free space on your startup disk, right in the menu bar.
- Click it for every connected disk: used, free and total, with a bar for each.
- How much Broom found that can be cleared, from your last scan.
- When and what you last scanned, with a Scan button and Open Broom.
Light on resources
The menu bar item reads only a small saved summary, never the whole scan, and Broom drops its file index from memory when you close the main window. The popover opens on whichever display you clicked.
Without an app
macOS doesn't offer free space in the menu bar. You can check it in System Settings › General › Storage, in Finder with ⌘I on your disk, or with df -h / in Terminal. See how to check Mac storage and checking disk space in Terminal.
Questions
How do I show disk space in the Mac menu bar?
macOS can't do it on its own. Install a utility like Broom, which shows free space on your startup disk in the menu bar and every disk when you click it.
Does it show external drives?
Yes. Clicking the menu bar item lists every connected disk with its free space.