https://itunes.apple.com/app/apple-store/id452204407?pt=5460...
It connects to a remote virtual browser.
1. I looked into Sidecar ( https://support.apple.com/en-us/HT210380 ) to use an iPad as a second display with a mac, but it says that only iPads 3rd generation (2019) or newer are supported. Models: https://support.apple.com/kb/HT201471#ipadair
2. The mac's built-in screen sharing is a VNC server.
3. When you search in the ios app store for "vnc" the list of other suggested apps seems to have a bunch.