iStat Menus
iStat Menus is a system monitor that you can control directly from the menubar. This latest version of the application sports a new and fresh design that is modelled for Yosemite.
The application has clean, crisp and clear menubar icons and dropdown menus. iStat Menus gives you information on your system temperature, system fans and Bluetooth.
KEY FEATURES INCLUDE:
CPU: You can monitor CPU usage. Multiple core support with 7 display modes.
Memory: Monitor Memory usage. 4 display modes, page ins/outs and swap usage display.
Disks: Monitor Disk usage and activity. 6 display modes, ability to hide disks.
Temp: Monitor the Temperature of your system. 2 display modes, with the ability to hide sensors.
Requirements: OS X 10.8 or later