LeftHandy

Left-handed cursor and mouse button support for macOS

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LeftHandy is a menu bar app that adds left-handed mouse and cursor support to your Mac.

Requires macOS 14 Sonoma or later.

Features

• Cursor Flip — Mirrors all system cursors (arrow, pointer, resize handles, crosshair, etc.) so the tip points naturally for left-handed use
• Mouse Button Swap — Swaps left and right click in real time via a low-level event tap — no System Settings changes needed
• Persistence — Automatically reapplies flipped cursors after display reconfiguration, app switches, and wake from sleep
• Menu Bar App — Lives entirely in the menu bar with a minimal dropdown: Active toggle, Swap toggle, Start at Login, About, and Quit
• Start at Login — Starts automatically when you log in to your Mac
• Welcome & Onboarding — First-launch flow walks you through granting Accessibility permission with real-time status monitoring
• macOS Tahoe Ready — Full support for macOS 26 Tahoe

Quick Start

Get up and running in under a minute:

1. Install

Download the latest LeftHandy.dmg from the Releases page, open it, and drag LeftHandy to your Applications folder. The app ships as a universal binary (Apple Silicon + Intel). Every release is code-signed, notarized, and stapled by Apple.

2. Grant Permission

On first launch, LeftHandy opens a welcome window asking for Accessibility permission. Click Allow for Accessibility to open System Settings, then add LeftHandy to the allowed list. The app detects the permission change automatically.

3. Use It

That's it. Toggle Active to flip your cursors and toggle Swap Mouse Buttons to swap left/right click. Both settings persist across restarts.

Important

LeftHandy requires Accessibility permission to function. Without it, the app cannot flip cursors or swap mouse buttons. You can grant this in System Settings → Privacy & Security → Accessibility.

Development

Build from Source

1. Clone the repository:

   git clone https://github.com/writronic/LeftHandy.git
   cd LeftHandy

2. Open LeftHandy.xcodeproj in Xcode 16+.
3. Build and run the LeftHandy scheme.

Note

LeftHandy has no external dependencies. The project builds with only Apple frameworks.

Contributing

Contributions are welcome! Please read CONTRIBUTING.md before getting started.

Bug Reports & Feature Requests

Search existing issues before opening a new one. Provide clear reproduction steps for bugs and a concise rationale for feature requests.

Code

Fork the repository, create a feature branch, and open a pull request. Keep changes focused and include relevant tests.

License

LeftHandy is available under the GPL-3.0 license.

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Made with ❤️ by Writronic