Archimede FlowChart is the application that replaces Q FlowChart and is the right choice if, in addition to having an iPad, you also own a mac.
Try Q FlowChart for free and if you like it you can think about buying Archimede FlowChart
Archimede FlowChart has been completely rewritten in the core for the migration from OpenGL to Metal.
Compared to Q FlowChart you will find:
Better text management (bold, italic, underline, font choice, alignment of text in shapes)
Ability to export documents to iCloud, Google Drive, etc ..
Document format compatible with Archimede Whiteboard for mac(to be purchased separately): you can work at home on Mac, save in the iCloud folder and then continue with iPad or vice versa
Possibility to insert mathematical formulas compatible with MathJax (Latex formulas).