MindFlow is one of best tools for building structure and flow diagram quickly. It's very easy to use without complex user interface.
Click the branch to begin editing, and long press to show menu options that you can move, copy, delete, connect, export for branches. You can change the shape of branches, the theme of diagram in the App Settings.
We supports our cloud service to backup and sync files, and you can sync files between different devices.
If any question and suggestion, please contact email@example.com, thanks!