StatsCenter download

This app lets you monitor real-time system statistics.
Counter
Download on the Mac App Store

Alternative apps

Battery Guru
Battery Guru
Free
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Menubar application that tracks laptop battery health.

iStatistica Sensors
iStatistica Sensors
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Check information about battery, RAM usage, network statistics and much more.

Command Center
Command Center
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Professional Control Center app.

Wattagio
Wattagio
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Get information about current battery health, including battery life, battery consumption, and battery cycle count.

X Resource Graph
X Resource Graph
Free
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XRG is an open source system monitor for Mac OS X.