Sidecar was released with macOS Catalina in 2019, which allows users with a Mac to use an iPad as a second screen. You couldn't interact with the tablet in iPadOS. This feature would only display whatever you chose from the Mac.
But it's not had its time to shine in three years, with many wondering what the feature does, and how it works. Universal Control has only confused this further, with some wondering if it replaced Sidecar.
During my time using an iPad in 2021, I was able to get Sidecar working with my old MacBook Air (2013), so I wanted to finally straighten out the differences between Universal Control and Sidecar, and how both can be used for certain situations.
What's the difference?
The best way to think of these features is to see Sidecar as a way of only displaying content, while Universal Control is a way to manage content between devices.
You can use your trackpad and keyboard to manage content between your Mac and iPad in Universal Control. But in Sidecar, you're essentially using macOS on both devices, so your Mac thinks it's connected to a second display only. There's no iPadOS when you're using Sidecar.
You're using a keyboard and mouse within this feature, similar to using three external displays in Windows 11 for example – same OS, but an extension of the display. That's what Sidecar's function is for your Mac.
In an Apple Support document, it details the requirements to use the feature and it explicitly states that you can use AirPlay for Sidecar to work wirelessly or a lightning or USB-C cable to connect your Mac and iPad to also enable Sidecar.
But in Universal Control, you only have to make sure that your Mac and iPad are on the same Wi-Fi network and the same iCloud account. As long as they're both in close proximity to one another, you can use your trackpad or mouse to switch over to the iPad, with no effort necessary to enable the feature.
Sidecar is still a useful feature in 2022, especially if you have an old iPad somewhere. Using a Mac with an external display can be a great help if you're doing work, watching a movie, or playing a game.
Even though Apple hasn't showcased Sidecar much since 2019, it's nice to know it and Universal Control can stand aside one another and can fit certain situations when needed, wherever you may be.
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