Let’s explore the topic of using an iPad as a second monitor for your Mac.
First up is Sidecar, a feature built into macOS that lets you use an iPad as a second monitor. Unfortunately, this feature is only available on certain Mac and iPad models. But fear not, as there are third-party apps that can fill the void for those with unsupported devices.
One such app is Splashtop Wired XDisplay, which can transform your iPad into a second monitor. This app requires a USB connection and is made up of two components: a desktop agent and a mobile app for iPad or Android. While it may not provide the smoothest experience, it is an affordable option to consider.

Another third-party app to look into is Duet Display. This app is more expensive than Splashtop Wired XDisplay but offers the smoothest experience. It comes with a companion app for your computer and tablet, and you can adjust the frame rate and resolution for optimal performance.
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Overall, if you have a Mac and iPad that are less than five or six years old, Sidecar is the best option for using your iPad as a second monitor. You can connect wirelessly or over USB, and even use your Apple Pencil to draw in supported apps.