Magnet vs SizeUp (2026): which should you pick?

Pick Magnet if

• Fits if you arrange windows by dragging them to the edges of a Mac screen
• Works for desks with up to six external displays, including a vertical one

Look elsewhere if

• Not for you if you want to try before you buy, as no free version or trial is mentioned
• Skip it if you move windows between Spaces a lot, because it only arranges them within the active one
• Not for you if you run Adobe apps older than the 2017 versions, or need non-standard windows resized
• Skip it if you're on Windows, Linux or a Mac older than macOS 13 Ventura; it's sold only on the Mac App Store

Pick SizeUp if

• Fits if you'd rather resize windows from the keyboard on a Mac
• Works for people with several monitors and Spaces

Look elsewhere if

• Not for you if you're not on a Mac, as no other system is listed
• Watch out: the page doesn't name any macOS release newer than Sonoma
• Skip it if you want drag-to-snap layouts, because it's keyboard-led
• Watch out: the free trial has no stated end, so the page doesn't say what it limits

Magnet

• macOS only and sold solely through the Mac App Store; it requires macOS 13 Ventura or later.
• The pages read mention no free version or trial; the app is a paid download.
• Windows can be arranged within the active Space but not across different Spaces.
• Non-standard windows cannot be resized, and Adobe Creative Suite and Creative Cloud apps older than the 2017 versions are not supported.

SizeUp

• Mac only; the page says it is compatible with Mac OS X 10.6 and later, including macOS 14 Sonoma.
• The page does not name any newer macOS release than Sonoma.

Magnet

Drag-to-snap trigger areas

Drag a window to a screen corner to snap it into a quarter, or to a side edge for a half. The top edge maximizes the window and the bottom edge creates thirds.

Keyboard shortcuts

Window commands can be run from keyboard shortcuts, which are optional and customizable.

Menu bar and green button menus

Commands are also available from a menu bar icon, which can be hidden, and from the menu on a window's green button.

Custom commands

Beyond the built-in set of commands, the App Store listing describes an unlimited number of custom commands and configurable layout properties.

External and vertical displays

Supports up to six external displays. On a vertical screen, thirds are created along the sides, with quarters and halves in the corners and on the bottom edge.

iCloud sync

Settings can optionally be synchronized through iCloud, according to the App Store listing.

SizeUp

Split and quarter actions

Fill the left, right, top or bottom half, or a quarter, of the screen with the frontmost window.

Multi-monitor and Spaces

Move a window to another monitor, optionally resizing it, or to another Space.

SnapBack

Restores a window to the size and position it had before SizeUp changed it.

Margins

Reserve space at screen edges or add gaps between windows.

AppleScript

Build custom actions such as thirds or anchoring a window to an edge.

Global shortcuts

Trigger every action from configurable keyboard shortcuts in any app.

Magnet

• Magnet$4.99

  one-time purchase (US Mac App Store price)

  A perpetual license with free updates, no subscription and no in-app purchases. The listing supports Family Sharing.

SizeUp

• SizeUp$12.99

  per license

  Includes a 60-day money-back guarantee.