Changing a sentence to ALL CAPS on my Mac is dead easy: I just select the words, right click and choose Transformations from the contextual menu. If I want to do anything fancier, like weird Markdown footnotes, or adding bullet points to the start of every line, I can just write an Automator workflow and save it as a System Service.
But on iOS? In the immortal words of Run DMC, “it’s tricky”. Or was tricky: now we can use the $5 TextTool to do it for us.