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

Using TwoUp

TwoUp consists of four actions which can be performed on the frontmost application window:

Left Move and resize a window to fill the left half of the screen
Right Move and resize a window to fill the right half of the screen
Up Move and resize a window to fill the top half of the screen
Down Move and resize a window to fill the bottom half of the screen

These actions can be triggered via the TwoUp Menu in the Mac menu bar or via system-wide shortcuts. The default shortcuts can be triggered by holding the Control+Option+Command keys while pressing an Arrow key to indicate the direction you wish the window to go. The shortcut keys can be customized in the TwoUp Preferences.

Known Limitation

TwoUp only works on primary monitor (see SizeUp for multi-monitor support)
TwoUp works with most applications as long as standard window types are being used. Non-standard windows may exhibit unexpected behavior or not respond at all.

What's New:

TwoUp 1.0.1 is now available with a number of bug fixes a few feature changes (pretty minor). Here’s the change list:


* “About TwoUp” added to the menu
* Displays alert if an application is incompatible with TwoUp


* Sparkle misconfigured for signed updates
* Not working with some non-English locales
* Finder windows too wide if Dock is on the left
* Some applications resize below bottom of the screen
* Preferences window opening behind other windows
* Shortcut keys in menu incorrectly show shift character

Unfortunately, Sparkle Framework was misconfigured in TwoUp 1.0.0, so updates will not install properly with the automatic downloader.