What sort of apps can you build with Haskell For Mac? The website gives me the impression it’s more akin to Swift Playgrounds than IntelliJ.
From the tutorials they give, you can build all types of stuff. It looks like the IDE supports game development as well as some data analytics tools. In Haskell for Mac, the right side is like Swift Playgrounds (REPL) and the left side is like IntelliJ (IDE). It's actually kinda weird but that's how it's setup.
[1] - https://cryptomiso.com