If you want to turn an Android tablet into a second screen, or want to use a Windows PC with an iPad, Splashtop Wired XDisplay will do the job for $10 (you can try it for free first).

You can use any phone or tablet as a secondary display on Windows. This can be helpful if you want to increase your productivity or if you want to use your phone or tablet as a second monitor.

How to use an iPad as a second screen for Windows Windows can’t use your iPad as an extra display out-of-the-box, but there are a few third-party apps you can use as a workaround.

Sidecar in macOS turns your iPad into a second display, but it's limited to certain Macs and iPads. Thankfully, a few ...

I literally have no idea how using your S9 Ultra as a 2nd monitor works, you mention both wired and wirelessly which doesn't help clarify at all. Could I ask you to explain that to us? But at a ...

This guide takes you through the steps to set up and use an Android device as a second screen for Mac using wired or wireless methods.

It's easy to use your iPad as an extra screen for your Mac. Here's how to connect your Mac and iPad so you can use the iPad as a second screen.