Free space on your boot disk, in the menu bar. One glance tells you how much room your Mac really has left — the same figure Disk Utility shows, not the optimistic one.
Size, percent or both · warning colour when space runs low · one click to Storage settings and Disk Utility.
Free. Requires macOS 13 or later.
No accounts, no analytics, no network connection. Your data never leaves your Mac.
What the app does
01
Finder treats purgeable space as free — local Time Machine snapshots, caches, offloaded iCloud files — which is why it often claims far more room than you have. SpaceDisk shows the strict figure in the menu bar, the same figure Disk Utility reports (and df in Terminal), and lists both figures in the menu so you can see the difference.
02
Choose what the menu bar shows: “36 GB”, “4%” or “36 GB (4%)”. The choice is remembered. The figure refreshes every 30 seconds and whenever you open the menu.
03
Below 15% free the disk icon in the menu bar is replaced by an orange dot, and below 5% by a red dot, so the change shows even if you do not notice the colour. You see the problem before macOS starts complaining and apps fail to save.
04
Open the Storage pane of System Settings or Disk Utility straight from the menu, so you can clear space the moment you see the figure drop.
05
No Dock icon, no window. SpaceDisk lives in the menu bar and starts with your Mac once you add it to Login Items in System Settings.
06
SpaceDisk watches the disk macOS starts from, the one that fills up and stops your Mac working. It does not monitor external drives or network volumes.
SpaceDisk asks macOS how much free space your boot disk has, and shows it. It has no accounts, no analytics, no ads and no tracking, and it makes no network connections: the app has no network entitlement at all. The only thing it stores is your display preference.