Mectrics is a free and open-source macOS system monitoring app that puts your Mac’s essential performance metrics directly into the menu bar. It provides a lightweight way to keep track of your computer’s health without opening separate monitoring tools or navigating through system settings.
The app can display important system information including CPU usage, memory consumption, battery status, network activity, disk usage, GPU performance, temperature, and fan speeds. Users can choose exactly which metrics appear in the menu bar, allowing them to create a monitoring setup that matches their workflow.
Beyond individual statistics, Mectrics includes a Compact Health mode that combines overall machine status into a single menu bar indicator. This keeps the interface clean and unobtrusive while still making it easy to notice when something requires attention.
When users click the menu bar widget, they can access more detailed information about their Mac’s current performance and hardware conditions. This provides a balance between always-visible monitoring and a clutter-free desktop experience.
Built with an open-source MIT license and supporting macOS 15+, Mectrics is designed for users who want transparency, customization, and control over system monitoring. It offers a simple alternative to heavier observability tools while keeping essential Mac health information available at a glance.