1Piece
1Piece is a multifunctional Mac utility that helps you manage windows, switch apps and spaces, and trigger actions with hot keys and mouse gestures.
What is 1Piece?
1Piece is a native macOS utility app for improving everyday window and desktop control. It helps Mac users switch between open windows, manage window size and position, and move around Spaces and displays more quickly than with standard macOS controls alone. The app combines several productivity-focused tools in one place, including window lists, desktop window thumbnails, hot corners, mouse-triggered actions, and keyboard shortcuts for navigation and layout changes. It also includes tools for returning to a previous window, hiding or showing the Dock automatically, adjusting windows when apps become active, and launching actions from repeated modifier-key presses. Some features extend familiar macOS workflows such as QuickTime Player controls, Stage Manager switching, screenshots, and app-wide hide or quit commands. Published by Takahiro Fujita, 1Piece is designed for people who want faster desktop navigation and more flexible window management on Mac.
Key features
- Show a list of open windows and switch directly to the one you want.
- Display window thumbnails on the desktop for faster window selection.
- Resize and reposition windows with hot keys, menus, and window snapping.
- Use hot corners to switch spaces, change windows, or trigger other actions.
- Run actions from mouse gestures on window title bars and other interface areas.
- Jump back to the previously active window with a keyboard shortcut.
- Automatically adjust window placement when an app becomes active.
- Trigger apps, files, scripts, or workflows by pressing a modifier key twice.
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Mostly safe
1Piece is a legitimate Mac utility for window and desktop control. Features such as hot corners, mouse actions, window management, and app switching may require normal macOS permissions like Accessibility so the app can interact with other windows and input events. That kind of access is expected for this type of tool, but it also means the app can observe and control interface actions across apps. If you use it, grant only the permissions you want it to have and review those permissions in macOS Privacy & Security settings if you stop using certain features.
Recommendation: Keep 1Piece if you actively use its window management, hot corner, or shortcut features. If you no longer use those productivity tools, you can remove it to reduce background utilities and revoke any permissions you previously granted.
Common paths
/Applications/1Piece.app
Cache paths
~/Library/Caches/jp.fuji.1Piece
Preference paths
~/Library/Preferences/jp.fuji.1Piece.plist
Share your experience
Be the first to share your experience.