Excellent on both iOS & macOS
iThoughts makes quick brainstorming easy then enables deep reflection to fill out your ideas. And when youre ready to go onto the next phase of polishing a piece, its markdown export is excellent (especially with Marked 2 on macOS). Moreover, the maps are beautiful and theres a surprising amount of advanced features and shortcuts, though you by no means need to learn them right away. More than worth the price; a truly pro app on the iPad.
Brucehs about
iThoughts - Mind Map, v3.10