Based on our record, Air Display should be more popular than Samsung DeX. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Possibly! If you go to http://samsung.com/us/explore/dex/, you can still download the Dex Mac app. It didn't work on my Mac with S22, but people have been able to get it to work with S21 and older even after they dropped support. You'll need to connect a USB C cable from your tab S7+ to the Mac, as it doesn't support wireless. Source: almost 2 years ago
Https://avatron.com/applications/air-display/ Not sure, if it does screen mirroring. Source: almost 2 years ago
If you're talking about Target Display Mode, I'm afraid your iMac does not support it. You can still use something like Air Display, although I'm not sure if it will help you achieve what you want. Source: over 2 years ago
The other option is via software like AirDisplay, but that does cost money as well! Source: about 3 years ago
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
scrcpy - Display and control your Android device from your computer
iDisplay - iDisplay is an app that turns a mobile device into a secondary desktop monitor. The app currently supports iOS, Android, Windows and MacOS, and it lets users connect a desktop computer to a mobile device over WiFi. Read more about iDisplay.
Vysor - Vysor lets you view and control your Android on your computer.
spacedesk - spacedesk expands the Windows desktop computer screen to other computers over the local area...
Mountie - Mount a second screen (iPad/iPhone/tablet) to your MacBook