I believe Clean Text is the purest expression of plain text editing for iPhones and iPads, like TextEdit on Mac. I’ve been gradually transitioning my notes into plain text. I still use Apple Notes for its rich text and support for images. But plain text is a great backup solution. Clean Text doesn’t try to force you into its own note-taking paradigm; in fact it’s not a traditional note-taking app at all. Unlike other note-takers I’ve used, Clean Text, as the name suggests, cleans your text. It has tools to fix line breaks, join paragraphs, remove empty lines, replace tabs with spaces, and lots more. When you’re done you can copy the text to another app or export it to Files. One note at a time without a subscription or in-app purchase. One up front purchase of US$0.99. I created a shortcut that copies text from the input (share a plain text file to it) and opens Clean Text where you can paste it. Good for quickly editing a text file from Files.