System Monitors for MAC
12 free Mac apps in System Monitors, including Performance Monitor, Better Resource Monitor, and Mole Widget. Each app page lists its version, size, macOS requirement and what’s new, and the download button leads to the developer’s official source.
12 apps
Performance MonitorPerformance Monitor is a lightweight menu bar app that shows what your Mac is doing right now. A live readout sits in the menu bar, and one click opens a popover with cards for CPU, memory, disk, thermal, GPU, battery, network and Bluetooth. Each card opens a detail window with charts, per-core usage, top processes, listening ports, individual temperature sensors and fan speeds. A plain-language verdict at the top of the overview tells you what is happening and what you can do about it.System Utilities
Better Resource MonitorBetter Resource Monitor is a lightweight system monitor that lives in the Mac menu bar. It keeps CPU, memory, storage, GPU and network usage in view all day, so you can spot unusual load without stopping what you are doing or opening Activity Monitor. Its developer describes it as a quiet, low-noise tool for the core numbers people check every day, rather than a full hardware dashboard.System Utilities
Mole WidgetMole Widget is a lightweight system monitor that lives on your Mac desktop. It shows live CPU, memory, disk, network, battery and process figures in a borderless window that sits above the wallpaper and below your app windows, styled after the terminal look of the mo status command from the Mole command-line tool. A header shows your chip, RAM, macOS version, uptime and an overall health score from 0 to 100, and clicking any section title opens Activity Monitor.System Utilities
Core-MonitorCore-Monitor is a native system monitor and fan controller for Apple Silicon Macs. It shows CPU, GPU, memory, battery, thermals, power draw, fan speeds, network and disk in one dashboard, with readings taken from the Apple SMC and standard macOS system APIs. You choose which readings appear in the menu bar, open a compact popover for a larger summary, and can put live widgets on the Touch Bar if your Mac has one.System Utilities
HardwareVisualizerHardwareVisualizer is a desktop app that shows how your computer's hardware is doing right now and how it behaved over days and months. It has live gauges and graphs for CPU, memory and GPU usage, per-core usage and running processes, plus a specifications sheet with a hardware report you can copy. Its Insights section looks back at usage history, and a menu bar widget keeps the main figures in view.System Utilities
MenuMetersMenuMeters is a set of CPU, memory, disk and network monitors that live in the Mac menu bar, where document windows cannot cover them. It was originally written by Alex Harper. Apple's changes in OS X El Capitan stopped the original from working, so Yuji Tachikawa ported it, and this version has since taken in contributions from many people. It is now an independent app rather than a preference pane.System Utilities
FannyFanny lets you keep an eye on your Mac's fans and temperatures without cluttering your workspace. It is a small menu bar app and Notification Center widget that shows the current, target, minimum and maximum speed of each fan, how many fans your Mac has, and the CPU and GPU temperature. Just open the menu bar app or Notification Center to glance at your fan stats.System Utilities
SlothSloth shows all the open files, folders, network sockets, pipes and devices in use by every process running on your Mac. That makes it easy to find out which app is holding on to a file you cannot delete or eject, which programs are talking to the network, and on which ports. You can filter by name, access mode, volume, type or location, use regular expressions, and sort by process, file count, type and more. An inspection window gives detailed information about any file, socket or process, and a contextual menu offers handy file actions.System Utilities
Macs Fan ControlMacs Fan Control shows the temperature sensors and fan speeds of your Mac in real time and lets you take control of the fans. You can set a fixed fan speed in RPM, or have a fan speed up and slow down with the temperature of a sensor you choose, which helps with a MacBook Pro that runs hot or a noisy iMac after a hard drive replacement. Macs Fan Control is made by CrystalIDEA.System Utilities
iStat MenusiStat Menus puts everything about your Mac into the menu bar. It shows CPU and GPU load, memory, disk space and activity, network traffic, temperatures and fans, battery and power, the weather and the time, each as a small menu bar item that opens a detailed menu with history graphs and the apps using the most resources. It is made by Bjango, has been around for nearly 20 years, and has no ads, analytics or tracking.System Utilities
coconutBatterycoconutBattery shows how healthy the battery in your Mac, iPhone or iPad is. It reads the battery's original design capacity and its full charge capacity today, so you can see at a glance how much it has worn, along with the number of charge cycles, the current charge, temperature and live charging information. It has been made by coconut-flavour.com since 2005 and is only available from its own website, not from any App Store.System Utilities
StatsStats is a free, open-source system monitor that lives in the Mac menu bar. It shows how hard your CPU and GPU are working, how much memory and disk space you are using, your network speed, battery level and sensor readings, each as a small widget you can style the way you like. Click a widget and a popup shows the details, such as the apps using the most CPU or memory. Stats is made by Serhiy Mytrovtsiy and released under the MIT license.System Utilities