SizeUp is described as '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)' and is a Window Manager in the os & utilities category. There are more than 50 alternatives to SizeUp for a variety of platforms, including Mac, Windows, Linux, Android and Google Chrome apps. The best SizeUp alternative is Rectangle, which is both free and Open Source. Other great apps like SizeUp are BetterTouchTool, SnapZones, AquaSnap and MacsyZones.
Move and resize windows on macOS with keyboard shortcuts. Rectangle is a window management app based on Spectacle Wndow Manager, written in Swift (programming language).
Rectangle is the most popular Mac alternative to SizeUp.
Rectangle is the most popular Open Source & free alternative to SizeUp.
BetterTouchTool is a great, feature packed app that allows you to configure many gestures for your Magic Mouse (1 & 2), Macbook Trackpad and Magic Trackpad (1 & 2) and also Mouse Gestures for normal mice.
It has nothing to do with automatic window resizing and positioning
BetterTouchTool is the most popular commercial alternative to SizeUp.
Organize windows with ease using SnapZones. Enjoy magnetic snapping, predefined and custom layouts, multiple display configuration, and seamless transitioning between workspaces. SnapZones auto-starts at login, ensuring streamlined productivity for macOS users in any environment.
Optimize your desktop environment with this management tool offering window docking, snapping, multi-monitor support, and keyboard shortcuts for enhanced productivity.
It's way too basic and serves no purpose.
AquaSnap is the most popular Windows alternative to SizeUp.
Customize layouts and sections for organizing windows into defined zones on macOS, easily snap and rearrange application windows, support multitasking needs, reduce desktop clutter, and enhance work efficiency for users managing multiple windows.
Access all native macOS window tiling commands in one place — the Tiling Panel. Customize keyboard shortcuts and use them on any keyboard, even third-party ones.
WindowGrid is a modern window management program that allows the user to quickly and easily layout their windows on a dynamic grid.
A native macOS menu bar app that provides quick window tiling with keyboard shortcuts and visual grid overlay. Just press QWE, ASD to tile your windows instantly. DRM-free, one-time purchase for all your Macs.
Divvy is an entirely new way of managing your workspace. It allows you to quickly and efficiently "divvy up" your screen into exact portions.
Moom makes window management as easy as clicking a mouse button—or using a keyboard shortcut, if you're one of those types of people.
AltDrag allows you to move and resize windows much easier. When you have it running you can simply hold down the Alt key and then use your mouse to drag any window, and it doesn't matter where in the window you click.
Split screen and organize windows on Mac with keyboard shortcuts, drag-and-drop zones, and professional layouts. Better than native Split View. Multi-monitor support.
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BetterTouchTool is the best alternative to SizeUp for me because I only wanted to use SizeUp for keyboard shortcuts to move windows between desktops. SizeUp it looking to be pretty dated, and requires you to release all modifier keys in order to initiate the move to a different desktop. BetterTouchTool is a behemoth app that does 100x more than what SizeUp does, but that works for me.