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SixtyFour is a memory optimizer and system utility for 64-bit-capable hardware running Mac OS X 10.5 or higher.

SixtyFour presents a list of 64-bit apps that can open in 32-bit mode and facilitates the setting of a preference to force a listed app to open in 32-bit mode.

An app opened in 32-bit mode uses significantly less memory than when opened in 64-bit mode.

Running most if not all apps in 32-bit mode on systems that have little memory available could potentially lead to an increase in overall system performance.

What's New

Version 1.1.0:
  • Improved performance under Mac OS X 10.7 Lion or higher


  • OS X 10.5 or later

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5 8


Current Version (1.x)


Downloads 6,777
Version Downloads 662
License Demo
Date 01 Jan 2014
Platform Intel 64 / OS X / PPC 64
Price $2.99
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