Cycling edge hotkeys
Left, Right, Top and Bottom each step through 1/2, 2/3 and 1/3 when you repeat the shortcut within the timeout, then return to half.
Open source · macOS 14+ · Universal binary · Window Management
One hotkey.
Every window size.
Press Control-Option-Left again and again to cycle a window through half, two-thirds and one-third of the screen. Right, Top and Bottom work the same way.
Free & MIT licensed · Apple Silicon & Intel · Latest release
Features
Fewer shortcuts, more layouts.
One shortcut per direction walks through several sizes, so you only need to remember a handful of keys.
Editable cycles
Give each direction its own ordered list of up to 6 steps, chosen from 1/4, 1/3, 1/2, 2/3 and 3/4. Set the gap to 0-40 pt and the reset timeout to 0.5-5 seconds.
Multi-display aware
Fractions come from the visible frame of the display the window mostly sits on, excluding the menu bar and Dock. Next Display moves a window across screens, keeping its relative position and size.
Maximize, Restore and Center
Maximize toggles back to the window's previous frame. Center cycles 60%, 80% and the original size.
Careful with your windows
Repeats only advance if the window is still where the app put it. Full-screen windows are skipped, non-resizable windows are only moved, and steps a window's minimum size blocks are skipped.
Menu bar app with a layout HUD
A brief overlay names the layout, such as Left 2/3, and can be turned off. The menu lists every action and its hotkey, and the shortcut recorder warns about likely system conflicts.
Screenshots
See it in action.
Install
Up and running in a minute.
SizeCycleKeys is open source and not notarized with a paid Apple Developer ID, so macOS needs one extra step the first time.
- Download SizeCycleKeys-macOS.zip and unzip it.
- Move SizeCycleKeys.app to your Applications folder.
- Clear the quarantine flag once, then right-click the app and choose Open:
xattr -cr /Applications/SizeCycleKeys.app
- Grant Accessibility access when prompted, or later in System Settings Privacy Security Accessibility, so the app can move and resize windows.
Download
Get SizeCycleKeys for macOS
Free, forever. Built for macOS 14 Sonoma or newer, Apple Silicon and Intel.
Not notarized: on first launch right-click SizeCycleKeys.app → Open.
- macOS 14 Sonoma+
- Universal (Apple Silicon + Intel)
- MIT licensed · open source
- No ads, no accounts, no telemetry
- Built with Claude Code · how and why
FAQ
Questions, answered.
Is SizeCycleKeys really free and open source?
Yes. It is released under the MIT license, has no paid tier, and contains no analytics or third-party dependencies. If it saves you time, you can optionally support development through the Support button.
What permissions does it need?
Only Accessibility, which lets it read the focused window's position and size, move and resize it, and check whether a text field has focus. It does not request Screen Recording, Camera, Microphone, Location or network access.
Where is my data stored?
Your shortcuts, cycles and settings are stored locally in macOS UserDefaults on your Mac. Nothing is sent anywhere, because the app has no network access.
Why isn't the app notarized?
Notarization requires a paid Apple Developer account, which this free project does not have. Right-click the app and choose Open once to run it, or build it yourself from source with Xcode.
Was this written by AI?
Yes. SizeCycleKeys was generated by Claude Code from a written spec as a clean-room reimplementation, with no code or assets from any commercial app. The full source is on GitHub under MIT, so you can read every line before you run it. It has had less human review than a hand-written app, so bug reports are welcome.
Support ❤️
Built by one person, given away for free.
SizeCycleKeys is a free, open-source alternative to paid utilities. If it earns a spot on your Mac, a coffee keeps the updates coming.
☕ Support Or on Ko-fi