A free macOS system monitor. Keep up to three CPU, memory, network or battery readings in your menu bar, in any of four styles. Click for disk space and the full panel. Nothing in the Dock.
Version 2.0.2macOS 15 or later
mStat is a free menu bar system monitor for macOS. Its full panel shows CPU, memory, disk, battery and network status. No account is required.
The monitoring panel and settings window on this page are interactive demonstrations. Their readings are simulated and do not access your device. The app supports ten languages; this website is available in Chinese and English.
Each one is drawn the way the app draws it, with readings computed live and shared with the panel at the top of this page.
Usage updates live alongside the user and system split, with a smoothed line covering the last minute. Per-core load is grouped into efficiency and performance cores, so you can see at a glance which half is working.
Move the pointer over the curve, or use the arrow keys to look back.
Used capacity and memory pressure side by side. The App, Wired and Compressed segments are scaled to their real share, so they add up to the used figure — nothing to reconcile.
Usage and free space are shown separately. When space runs short the bar and the icon both move to a warning state: colour never carries the message on its own.
Charge, charging state, time remaining and cycle count. On power the bar turns green and shows the time to full. Macs without a built-in battery hide this row and let the disk take the full width.
Upload and download mirrored around a centre line, with the peak called out separately. Click to copy the local IP; the public one stays masked until you reveal it, so screen shares and screenshots never leak it.
The same glass base, the same continuous corner radii, the same data colours. Menu bar display, appearance and language, and general all sit on one page — and every change shows up right away.
Up to 3 items
A mock of the settings window, and a clickable one: items, order, style, appearance and language take effect on the page straight away.
Living in your menu bar should cost nothing. Here is where mStat stands on that.
Learn how to read your Mac's system status, then choose the right monitoring tool.
Not finding it? Write to [email protected], or see the support page for more.
Yes. Download mStat for free from the Mac App Store, with no mStat account required. Show one to three CPU, memory, network or battery readings in the menu bar, and disk space in the full panel. It requires macOS 15 or later.
macOS 15 or later, on both Apple Silicon and Intel. It is a menu bar app and takes no space in the Dock.
Left-click the mStat status item in the menu bar to open the panel, right-click for the app menu. The panel closes itself once it loses focus.
Yes. The Menu Bar section in Settings lists CPU, memory, network and battery. Pick up to three and drag the tags to set their order. There are four styles: icon only, icon + value, two-line compact and mini chart.
Once a second by default, whether the panel is open or not, so the menu bar is always current. Turn on power saving and the closed-panel interval becomes 30 seconds; opening the panel still snaps back to every second.
CPU, memory, disk, battery and local network statistics are read and shown on your Mac. The public IP in the interface needs one HTTPS request to a third-party IP service; the address it returns is only ever displayed.
