How to Enable Sidecar in macOS Catalina for Unsupported Macs

Sidecar is a new feature introduced by Apple in macOS 10.15 Catalina, that turns an iPad into a second monitor for a Mac, either by extending what’s on the display or by mirroring the content. However, it appears that the feature may be limited to only a small selection of newer Macs at launch.

According to developer Steve Troughton-Smith, here’s the list of Macs that officially support Sidecar in the first beta of macOS Catalina:

  • Late 2015 27″ iMac or newer
  • 2017 iMac Pro
  • Mid 2016 MacBook Pro or newer
  • Late 2018 Mac mini or newer
  • Late 2018 MacBook Air or newer
  • Early 2016 MacBook or newer
  • 2019 Mac Pro

Troughton-Smith notes that Apple has blacklisted a long list of older Macs from taking advantage of the new feature. Luckily though, here is a terminal command that enables the use of Sidecar on older Macs running the beta.

To enable Sidecar in macOS Catalina on an unsupported Mac, simply use the following terminal command:

defaults write allowAllDevices -bool YES

Although the command is not guaranteed to work 100%, the majority of users seem to have enabled it successfully. Let us know if it works for you.