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CoolBook lets you monitor CPU frequency, voltage, and temperature.

Registered users may set voltage and frequency manually. This can dramatically reduce heat dissipation and fan noise.

Use your MacBook with full performance without a battery installed.

Storing your battery properly when not used will reduce battery aging.

What's New

Version 2.22:
  • Fixed an issue causing some Penryn models to report wrong frequencies.
  • Fixed an issue with the temp limit.


  • Mac OS X 10.4 or later
  • MacBook Pro or MacBook, some support for iMac and Mac Mini

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4 20


Current Version (2.x)


Downloads 38,578
Version Downloads 12,625
Type Utilities / System
License Shareware
Date 24 Feb 2011
Platform OS X / Intel 32
Price $10.00