Mos
Mos is a macOS menu bar utility that makes mouse wheel scrolling smoother and lets you customize scroll behavior and mouse buttons per app.
What is Mos?
Mos is a native macOS utility for people who use a mouse or trackball and want scrolling to feel smoother and more controlled. It runs from the menu bar and reshapes mouse wheel input so scrolling behaves more like a trackpad, while still preserving mouse precision. Users can tune scrolling with controls such as step, gain, and duration, set different behavior for individual apps, and configure vertical and horizontal scrolling separately. Mos also supports mouse button bindings, including actions, shortcuts, apps, scripts, and files, which makes it useful for multi-button mice and workflow shortcuts. It is especially helpful for Mac users who switch between browsers, terminals, design tools, and other apps that benefit from different scrolling profiles. Mos is published by Caldis and supports macOS 10.13 or later.
Key features
- Smooth mouse wheel scrolling with adjustable tuning controls
- Set different scrolling behavior for individual apps
- Configure vertical and horizontal scrolling independently
- Reverse scroll direction separately for mouse axes when needed
- Bind mouse buttons to shortcuts, system actions, apps, scripts, or files
- Use scroll hotkeys for acceleration, axis conversion, or temporary changes
- Work with Logitech HID++ button events on supported devices
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Safety overview
Status: Mostly safe
Mos is a legitimate local macOS utility for input customization, but it may request Accessibility permission so it can observe and rewrite scroll and mouse button events. That permission is consistent with its purpose, yet it is powerful because it allows broad interaction with input events. If you use Mos, review its Accessibility access in System Settings and keep it enabled only while you want its scrolling or button features active.
Recommendation: Keep Mos if you use a mouse on your Mac and want smoother scrolling or custom button actions. If you no longer rely on those features, you can remove it without affecting macOS itself, but your custom scroll behavior and button mappings will stop working.
Common paths
/Applications/Mos.app
Cache paths
~/Library/Caches/com.caldis.Mos
Support paths
~/Library/Application Support/Mos
Preference paths
~/Library/Preferences/com.caldis.Mos.plist
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