I’ve been looking for an app that will let me write down a bunch of short ideas/phrases and move them around easily. Something like scribbling on postits and sorting into piles, ordering and rearranging them.

So far I’ve found lots of task list / to do type apps that I can make lists and move things about in one axis. Or mind map type apps for building specific webs. But I’ve not come across something quick and easy to freeform engage with my brainstorming. Any suggestions?