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SizeUp allows you to quickly position a window to fill exactly half the screen (splitscreen), a quarter of the screen (quadrant), full screen, or centered via the menu bar or configurable system-wide shortcuts (hotkeys). Similar to "tiled windows" functionality available on other operating systems.

Additional features include moving windows from one monitor to another, from one Space to another, and restoring a window to its original size and position (SnapBack).

What's New

Version 1.6:

  • [New] AppleScript actions for thirds, anchors, and grids.
  • [Improved] OS X 10.9 Mavericks compatibility.
  • [Improved] Can now resize Help windows.
  • [Fixed] Opening preferences sometimes causes a Space change.
  • [Fixed] When SizeUp's disabled, shortcuts sometimes still work.


  • OS X 10.5 or later

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5 38


Current Version (1.x)


Downloads 18,578
Version Downloads 2,644
Type Utilities / System
License Shareware
Date 16 Oct 2013
Platform OS X / PPC 32 / Intel 32
Price $13.00
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