MMetrics

mmetrics.lollipopkit.com

Apple Silicon system monitor for the menu bar — CPU, GPU, memory, power, temperatures, fan, battery, network and disk, read from native macOS interfaces (SMC, IOReport, Mach).

Features

• Menu bar — two-row cells (value over caption). Choose any of CPU, memory, GPU, CPU temperature, system power, download and upload in Settings.

• Dashboard — click the menu bar item. Each section can be hidden in Settings; hidden Top Processes, Network, Disk I/O and Battery also stop sampling.

  Section	Content
  CPU	Overall · per-cluster (E / P / S, only those the chip has) · per-core · temperature · die hotspot · power
  GPU	Usage · frequency · temperature · power
  Fan	RPM (hidden on fanless Macs)
  Memory	Used / total · swap · DRAM bandwidth (when the chip exposes it)
  Battery	Charge · status · adapter / charge watts · cycles · health · capacity · temperature
  Network / Disk I/O	Download / upload · read / write throughput
  Top Processes	Top CPU consumers with memory

• Desktop widget — small and medium sizes with CPU, memory and thermal state.

• Appearance — Automatic, Light or Dark.

Install

brew tap lollipopkit/mmetrics https://github.com/lollipopkit/MMetrics
brew install --cask mmetrics

Or download the DMG from Releases and drag MMetrics to Applications. Releases are signed with Developer ID and notarised.

Data sources

Source	Data
Mach (host_processor_info, vm_statistics64)	CPU usage, memory, swap
IOReport	Cluster / GPU residency and frequency, energy counters, DRAM bandwidth
SMC	Temperatures, die hotspot, fan, system power; CPU power where IOReport has no CPU energy (M5 Pro)
pmset / ioreg / netstat	Battery, disk I/O, network

The optional helper (/Users/Shared/MMetrics/mmetrics-helper, installed by the cask) samples IOReport and SMC as root. The app works without it.

Build

Xcode 15+, macOS 13+, Apple Silicon.

git clone https://github.com/lollipopkit/MMetrics.git
cd MMetrics
open MMetrics.xcodeproj          # set your Team for MMetrics and MMetricsWidget
./scripts/build-dmg.sh           # ad-hoc signed DMG in dist/, helper embedded

Release (maintainers): ./scripts/release.sh <version> bumps the version, builds a Developer ID–signed DMG, notarises and staples it, updates the cask, tags, pushes and publishes the GitHub Release. One-time setup: a Developer ID Application certificate in the keychain and xcrun notarytool store-credentials mmetrics-notary.

Tested hardware

Mac	Chip
MacBook Air (2022)	M2
MacBook Pro (2026)	M5 Pro

Reports from other chips are welcome.

Acknowledgements

• Based on MacMonitor by Ryyan Safar.
• mactop — cross-validation reference during sensor research.

License

MIT