https://wccftech.com/which-macs-are-compatible-with-macos-10-15-catalina-list/

Here is a list of all the current Mac computers that are compatible to work with macOS 10.15 Catalina.

macOS 10.15 Catalina is a mighty big upgrade that really boosts the feature-credentials of the Mac in a lot of ways. For starters, if you have an iPad at hand, you can use the tablet as a secondary display for your Mac. If that doesn’t please you then you will be delighted to know that developers can now bring their iPhone and iPad apps to the desktop with a small change in code. Essentially, the Twitter for iPhone app is coming to Mac in the near future.