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

Pick Mosaic if

• Fits if you want to lay windows out by dragging on a Mac
• Works for people with more than one display

Look elsewhere if

• Watch out: prices are in pounds and the dollar amount is only shown at checkout
• Watch out: the vendor says major upgrades may carry an optional fee
• Tight if you want the Pro tools and use on 5 Macs, as that's the £29.99 edition
• Not for you if you're on Windows, as Mac with macOS 10.13 or higher is required

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

Mosaic

• Priced in pounds; checkout shows the equivalent in other currencies, so the dollar amount is not on the page.
• Mac only, requiring macOS 10.13 or higher.
• The vendor says major upgrades may carry an optional fee.

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.

Mosaic

Drag and drop layouts

Drop a window on a layout in the panel to resize and move it.

Custom layouts

Create basic or advanced layouts, plus single-use layouts with Quick Layout.

View modes and groups

Choose where layouts appear and assign a different group of layouts to each view mode.

Multiple displays

The layout panel follows a window to another monitor.

Pro tools

The page lists keyboard shortcuts, Quick Positions, Auto Layout, Window Capture and Touch Bar support under Pro features.

iOS remote

A companion app on the App Store can apply a layout from an iPhone or iPad.

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.

Mosaic

• Standard Edition£14.99

  one-time purchase

  Core feature set on a single Mac, with free bug fixes and optional paid upgrades.

• Pro Edition£29.99

  one-time purchase

  Complete Pro feature set on up to 5 Macs; the iOS remote control app needs this edition.

SizeUp

• SizeUp$12.99

  per license

  Includes a 60-day money-back guarantee.