Running a Mac should be a hassle-free experience. However, they’re not immune to issues and MacOS’ system monitor isn’t that great to just glance at your overall system health.
Check out these Mac Menu Bar System Tools Apps:
Collection:
System Tools
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Audio Apps | System Tools
Overkill
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System Tools
Ping Menubar
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System Tools
FreeSpace
This menu bar app shows all mounted volumes along with the available free space on each. If you only want to monitor a particular volume, you can choose to have that volume’s free space displayed right in the menu bar.
Collection:
System Tools