Do I need TextExpander for Mac or Windows to use TextExpander for iPhone & iPad?

TextExpander on your iPhone or iPad is a fully independent app, and can be used without having TextExpander on your desktop computer. You can create snippet groups, add new snippets, and assign abbreviations to them on the iPhone. You can also add Predefined groups (like AutoCorrect or Symbols), as well as add external snippet groups that you have uploaded to the internet.