Mac menu bar system monitor
CalmStat keeps CPU, memory pressure, storage, battery, network speed, and temperature visible from the menu bar without turning your desktop into a control room.
Direct download or Mac App Store. 7-day free trial, one-time purchase.
For Mac users who want system health visible at a glance, without keeping Activity Monitor open all day.
System monitoring is most useful when it is present before something feels wrong. CalmStat puts the everyday signals in one quiet place, so heat, pressure, low space, or network issues are easier to notice early.
Activity Monitor is powerful, but it is a separate window built for investigation. CalmStat is built for awareness: the lightweight checks you want before deciding whether to dig deeper.
CalmStat is designed to stay out of the way until the Mac needs attention. The app is native, polished, and intentionally restrained, with system metrics processed locally on your device.
CalmStat
The difference is not just the metrics. CalmStat is built around a calmer Mac experience: the kind of utility that can live in your menu bar every day and still feel refined.
Native SwiftUI app for macOS 14 and newer.
Polished visual hierarchy for fast scanning.
Lightweight idle behavior with adaptive sampling.
CalmStat is best for always-available monitoring and quick diagnosis. Activity Monitor is still useful for deep process inspection.
Yes. CalmStat lives in the macOS menu bar and opens a native popover for detailed CPU, memory, storage, battery, network, and temperature information.
No. System metrics stay on your Mac. The app has no telemetry, and network requests are limited to clearly disclosed features such as public IP lookup, speed tests, updates, and purchase validation.