MacMonitor app icon

Your Mac's vitals,
right in the menu bar

A lightweight, free and open-source system monitor for macOS. CPU, memory, disk, network, battery, temperatures, displays and weather, each with its own widget.

⬇ Download for macOS ♥ Support the project
Free · macOS 13 or later · Open source

Everything you need, nothing you don't

Build your own menu bar with a drag-and-drop widget builder.

⚡

CPU

Live usage with a per-core history graph and activity bars.

🧠

Memory

See what's used at a glance, with warning colours when it gets tight.

💾

Disk

Free space and usage, highlighted before you run out.

📡

Network

Upload and download speeds with clear, separate graphs.

🔋

Battery

Charge level and status, with low-battery alerts by colour.

🌡️

Temperatures

Keep an eye on heat with warning and danger thresholds.

🖥️

Displays

Connected display count and details.

⛅

Weather

Local conditions in your menu bar, with a remembered location.

🎨

Customisable

Drag-and-drop widget builder, colour themes, and a monochrome menu bar that follows light or dark.

🚀

Launch at login

Turn it on in Preferences and forget about it.

Install in 3 steps

It takes about a minute.

  1. Download the zip using the button above, unzip it and drag MacMonitor.app into /Applications.
  2. Open it. macOS will probably warn that it "could not verify" the app. That's expected: MacMonitor is open source and built on GitHub, but not signed with a paid Apple Developer ID.
  3. Allow it once. Run this in Terminal, then open the app normally: 
    xattr -dr com.apple.quarantine /Applications/MacMonitor.app

    Or go to System Settings → Privacy & Security and click Open Anyway.

FAQ

Is it really free?

Yes. MacMonitor is free and open source. Donations are optional and help keep development going.

Why the security warning?

The app isn't notarized because that requires a paid Apple Developer account. You can read the code and build it yourself if you prefer.

How do I upgrade?

Quit the running MacMonitor from its menu bar item, then replace the app in /Applications with the new version.

Which macOS versions work?

macOS 13 (Ventura) or later.

Can I build it myself?

Yes. Clone the repo and run ./scripts/build_app.sh (requires Swift 6). See the README.