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AppSizer (formerly MemorySetter) is an application memory management utility created by Michael Peirce for classic Mac OS.


Holding down the control key, command key, or other pre-set modifier key while opening an application invokes the AppSizer dialog box, which allows the user to modify the application's preferred memory settings without needing to access the Get Info dialog box.[1]


The control panel was originally released as MemorySetter with Now Utilities in 1990. Version 2 of Now Utilities left out MemorySetter to limit the drive space required to that of one floppy disk.[2]

Peirce then renamed the control panel to AppSizer and released it independently as shareware.[1] The last available version is 2.3.1. It does not work with Mac OS X, which handles application memory completely differently.


  1. 1.0 1.1 DiskStatus & AppSizer by Adam Engst, TidBITS. 1992-05-25.
  2. Now Utilities: Overview by Adam C. Engst, TidBITS #45. 1991.

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[[Category:Control panels]