The best alternatives to Textcraft are jekyll, Text Case 2.0, and Email Text Formatter. If these 3 options don't work for you, we've listed a few more alternatives below.
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Text Case is a universal iOS app that makes formatting text quick and easy. All formats can be copied with juset one tap, and you can access them via the Share sheet, or with Siri Shortcuts.
Flext is an app for iPhone and iPad. If you have a transformation you regularly want to apply to text, write it as a JavaScript function, import it into the app and you're done.