Casilla is a single-purpose menu bar utility that hides all running applications with one click. The name derives from the Spanish word for “box”—the app conceptually places all visible applications into a hidden container, revealing them again with a second click.
The core functionality addresses situations requiring quick screen privacy: colleagues approaching during work, sharing a Mac for presentations, or lending the computer temporarily. Rather than manually hiding applications individually with Command+H or minimizing windows one by one, Casilla sends the hide command to all running applications simultaneously.
The menu bar icon displays a box graphic indicating the app’s function. Clicking toggles between hidden and visible states for all applications. The app launches automatically on login and remains in the menu bar until needed, with minimal system resource usage.
Current functionality (version 1.2.4) operates as all-or-nothing—all applications hide or reveal together. The developer has indicated plans for selective hiding of individual applications in future updates, which would allow keeping specific apps visible while hiding others.
Pricing: Available on Mac App Store (pricing varies by region; check App Store listing).
System requirements: macOS compatible (specific version requirements on App Store listing).
Limitations: No selective application hiding in current version—the toggle affects all running applications. The app does not provide window management, application organization, or other features beyond the core hide/reveal functionality. Not a replacement for dedicated window managers or menu bar organizers.
Alternatives: Built-in Command+Option+H (hide other applications), Mission Control for workspace separation, or window management apps like Moom or Rectangle for more granular control.
Suitable for users who frequently share their Mac screen with colleagues, work in collaborative environments, or need instant privacy without quitting applications.
