Based on our record, Air Display seems to be more popular. 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.
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
Touch Bar Simulator - The macOS Touch Bar Simulator as a standalone app
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.
TouchBar for your old MacBook - Use Touch Bar on an iPad through USB connection
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.
My TouchBar My Rules (MTMR) - Customize your touch bar as you want it
spacedesk - spacedesk expands the Windows desktop computer screen to other computers over the local area...