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Your Mac, at a glance.

A lightweight system monitor that lives in your macOS menu bar.

Download for macOSv1.4.0 · 4.4 MB · macOS 15+Free and open source

Nothing leaves your Mac

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Mectrics in your menu barLive metrics
Mectrics showing disk, memory, CPU, network, Wi-Fi, and battery information in the macOS menu bar

Set it once

Make the menu bar yours.

Pick the numbers you care about. Everything else stays out of the way. Set a threshold and Mectrics speaks up when something is off.

CPUMemoryBatteryNetworkDiskGPUTemperatureFans

Temperature sits inside CPU, Memory and GPU. Hardware this Mac does not have hides itself.

Mectrics menu bar builder
Mectrics alert settings

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The detail behind the number.

Every item opens a popover with what is actually going on.

CPU: a bar per core
The Mectrics CPU popover: a load sparkline, a bar per core, core count, busiest core, temperature, and uptime
Disk: capacity and live throughput
The Mectrics disk popover: a usage ring, a used, purgeable and free bar, capacity figures, and live read and write throughput

Quiet by default

One item, until it matters.

Compact Health folds the whole machine into a single menu bar item and stays out of the way. It speaks up only when a condition holds — a brief spike is not news.

Rules watch either a number you pick or a state macOS reports itself, like your Mac slowing its CPU and GPU down to cool off. A hot sensor and a machine that has actually been slowed are not the same thing, and only the second one costs you time.

The Mectrics Compact Health popover reading All systems normal, with CPU, memory, network and disk summarized in one list

For headless Macs

An exit code, not a parser.

Mectrics ships a read-only mectrics command inside the signed app bundle. It reads the rules you already configured and drops straight into cron or an existing monitoring check.

check exits 0 when everything is within its limit and non-zero when it is not. Add --json when you want the detail, alerts watch to stream events as they happen. It changes no settings and makes no network requests. Read the docs.

$ mectrics check
HEALTHY · 3 rules checked
$ echo $?
0

$ mectrics alerts watch
ALERT system.thermalPressure
RECOVERED system.thermalPressure