IScroll Reverser is a free Mac app that reverses the direction of scrolling. It is available for macOS 10.4 onwards.

What's New:

  • Some internal changes to the way preferences are loaded. (As part of investigating Issue #38: Scroll reverser preferences randomly change.)
  • Translation updates, including a new Norwegian translation (thanks, Patrick).

macOS 10.15 users: Scroll Reverser is currently NOT fully compatible with Catalina due to various issues with the new security and privacy settings. I am working on trying to get the bottom it but it has been a frustrating experience so far.

For Scroll Reverser to work you will need to have it enabled in both the Accessibility and Input Monitoring lists under System preferences → Security & Privacy → Privacy. Even then it might not work, for no apparent reason....