Mosaic
Mosaic is a macOS window management app that helps you quickly resize and arrange application windows into custom layouts.
What is Mosaic?
Mosaic is a window management app for macOS designed to help users organize application windows more efficiently. It provides faster ways to resize and position windows than the standard manual approach, making it useful for multitasking, desk setups with external displays, and workflows that involve several apps at once. Users can arrange windows with drag-and-drop controls, keyboard shortcuts, and saved layouts that can be reused during the day. Mosaic also supports multi-monitor setups and includes more advanced layout tools for people who want tighter control over how their workspace is arranged. It is published by Light Pillar Software Ltd and is available both directly from the developer and through Setapp.
Key features
- Arrange app windows with drag-and-drop placement zones
- Resize and reposition windows using keyboard shortcuts
- Create and reuse custom window layouts
- Work across multiple displays with screen-specific layouts
- Use quick positions for common window arrangements
- Apply advanced layout tools for more precise workspace control
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Safety overview
Status: Mostly safe
Mosaic is legitimate productivity software for macOS. For its window management features to work fully, it may request standard macOS permissions such as Accessibility, and some features can involve Screen Recording or Input Monitoring prompts depending on the version and feature used. Those requests are normal for an app that detects, moves, and resizes other app windows. If you use it, grant only the permissions you want and review them later in System Settings if your needs change.
Recommendation: Keep Mosaic if you use custom window layouts, keyboard-based window placement, or multiple displays on your Mac. Remove it if you no longer use its window management features; the main effect will be losing its saved layouts, shortcuts, and automated window arrangement tools.
Common paths
/Applications/Mosaic.app
Cache paths
~/Library/Caches/com.lightpillar.Mosaic-setapp
Support paths
~/Library/Application Support/Mosaic
Preference paths
~/Library/Preferences/com.lightpillar.Mosaic-setapp.plist
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