I think this is the best overall mind mapping tool available on mobile devices and personal computers.
A bit more highly usable pure mind map functionality than it’s closest competitors; cross platform file compatibility for iOS, iPadOS, MacOS, Windows, Android, plus cloud sharing across all, doesn’t seem to be cluttered with obscure features that aren’t strictly mind mapping.
I like that the pro version supports OPML import/export if you never need to exchange files with other mindmapping or outlining tool.
A few minor quibbles... can’t yet move my custom style definitions to the top of the style list ahead of the pre-defined styles. And the iCloud sharing is only by slightly clunky sharing of exported files, not by the elegant and more simple iCloud entitlements for Apple common sandboxed data storage container, probably because file sharing needs to work across Google Drive, DropBox, etc., for non-Apple platforms as well.
Strangely, though, the Mac version doesn’t seem to support MS OneDrive file sharing even though MS Windows is a supported OS for the app itself. So for a lowest common denominator of file sharing, MS Windows files from SimpleMind shared with any other platform have to be on a third party file sharing service, even if you have a OneDrive storage account. Maybe if your OneDrive is integrated into and exposed in your file system explorer or Finder?
When I had a little confusion on licensing and questions on functionality, the customer support staff responded quickly and very helpfully. The software dev company seems to know how to run a business, not just code.
I think it’s worth the money if you need the pro version features.