Mos 4.2.1 for Mac
Mac UtilitiesAnyone who swaps between a trackpad and a mouse on a Mac knows the two annoyances Mos was built to fix. Wheel scrolling jumps in rough steps, and the scroll direction setting applies to both devices at once. Mos is a free menu bar tool that smooths wheel scrolling into a gentle glide and lets you reverse the mouse direction while the trackpad stays exactly as you like it. Updated Aug 16, 2026.
Key Features
- Smooth scrolling that makes the wheel feel like a trackpad
- Separate reverse setting for the mouse and the trackpad
- Independent tuning for vertical and horizontal scrolling
- Per app exceptions for programs that scroll in their own way
- Button and shortcut bindings plus a simulated trackpad mode
How to Download
- Go to Download from the official site and get the latest Mos release.
- Unzip the download and move Mos into your Applications folder.
- Launch Mos and grant Accessibility permission so it can adjust scrolling.
System Requirements
The project states that Mos supports macOS 10.13 and later. It lives quietly in the menu bar and needs Accessibility permission, since it reads and rewrites scroll events to smooth them out.
FAQs
Is Mos free?
Yes. Mos is a free open source tool released for non commercial use, and the download comes straight from the project site or its releases page.
Why does Mos ask for Accessibility permission?
It needs that permission to see wheel events and replace the stepped motion with smooth scrolling. Without it the app cannot change how your mouse scrolls.
Can I exclude apps where smooth scrolling feels wrong?
Yes. Mos has an exceptions list, so design or drawing apps where each wheel step matters can keep the standard behaviour while everything else glides.
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