Mac CPU monitor
CalmStat shows CPU load, system and user split, top processes, temperature, and fan speed from a native menu bar monitor, so you can spot pressure before the Mac feels stuck.
Direct download or Mac App Store. 7-day free trial, one-time purchase.
For Mac users trying to understand heat, fan noise, slowdowns, or sudden CPU spikes without leaving Activity Monitor open.
A CPU spike is often the first clue. CalmStat makes the signal visible before you start closing apps at random.
The important question is not just whether CPU is high, but which process is causing it and whether the Mac is also under thermal pressure.
CalmStat gives you the everyday CPU view in a polished macOS interface. You can keep an eye on the Mac without turning monitoring into another window to manage.
CalmStat
A useful Mac CPU monitor should be readable, quiet, and fast. CalmStat combines CPU data with the surrounding context that helps you decide what to do next.
CPU load, top processes, temperature, and fans in one glance.
Native, polished interface that feels at home on macOS.
Local-first metrics with no app telemetry.
Yes. CalmStat shows top processes so you can identify likely causes of CPU spikes before deciding whether to quit an app.
Yes. CPU load is shown alongside temperature and fan information, which helps you understand whether fan noise is connected to CPU pressure or heat.
Yes. CalmStat is designed for low idle overhead with adaptive sampling, so it can stay in the menu bar as a daily monitor.