You should be able to use Visual Studio Code with PlatformIO on OS X.
(OS X compatibility is one of the big reasons I pushed for it. I don’t own a Mac but I know someone who does.)
Grab a copy of VSCode:
Then go over to the extensions bar and search for PlatformIO, find it and install it (the icon should be a little orangey ant/alien head thing).
Then follow the instructions on the PokittoIO repo:
Let me know if you get stuck.
@adekto published a tutorial demonstrating this, but with really quiet sound:
Hopefully that should be enough of guide for you