Version: 1.2.0 || Release Date: 2014-01-01 || License: Commercial with demo ($4.99) Developer: 1951fdg | App Owner: 1951fdg

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.

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You can do the same by opening the info box of any app and checking the box "Open in 32 Bit Mode" to force the app to run in 32-bit.


SixtyFour doesn't list all 64-bit apps but lists apps that will open in 64-bit mode. A "64-bit aware app"(an app that also contains the ppc64 and/or x86_64 architecture) will not necessarily open in 64-bit mode and could just as well open in 32-bit mode. There are also other factors that collectively determine in which mode the app will open. SixtyFour takes these factors into consideration when presenting the list of apps.

For an app to be listed it must meet two conditions, the app will open and the app will open in 64-bit mode. Other "64-bit aware apps" that don't meet these two conditions will not be listed because they will either not open or open in 32-bit mode.

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