Chris Hannah, writing on his weblog about the newly released app:
Text Case is a simple utility that allows you to convert any text into various different formats.
It comes packed with an action extension that lets you select text anywhere in iOS, tap the Share button, and then you’ll find the “Convert Text” action. This will show you a preview of all available formats, and a simple tap on one of those will copy it to your clipboard, and you’ll be returned to the original app.
He’s also tweeted a preview of the next version, which will offer a few more text conversion options alongside a settings page that will let you hide unused conversions.