mectrics

mectrics puts the readings you pick into the macOS menu bar: CPU, memory, battery, network, disk, GPU, temperature and fans. Clicking an item opens a popover with the detail behind the number, like per core load and top processes for CPU, or read and write throughput for disk.

You choose what shows and how. A module can add more than one item, so battery can show its icon and its health side by side. Items reserve a fixed width, so values change without the bar shifting around.

Compact Health is an optional single item that summarises the whole machine and stays quiet until something is wrong. Alert rules can watch a number you set, or a state macOS reports itself, such as the Mac slowing the CPU and GPU down to cool off, or kernel memory pressure.

Hardware that is not present is hidden rather than shown as zero. There is no fans module on a fanless MacBook Air, and a missing reading shows a dash.

Sampling slows down on battery, in Low Power Mode, and when the Mac gets hot.

The app has no analytics and no identifiers. The only network request it makes is an update check, and it asks before doing that on its own.

The download also includes a read only command line tool for Macs whose menu bar nobody looks at. It reads the alert rules set in the app and returns exit codes that work in cron.

Requires macOS 15 or later. Apple silicon and Intel. MIT licensed.