TATEditor is an iPhone application designed for creating and editing text in vertical writing format. Ideal for writing novels, scripts, and scenes, this app offers real-time editing in a print layout, complete with a WYSIWYG interface. Users can customize their text with favorite colors, utilize a real-time character counter, and enjoy compatibility with dark mode. Additional features include custom font support for iOS 13 or higher, mouse compatibility for iPadOS 13.4 or higher, search and replace functions with regular expressions, and the ability to output PDF files. TATEditor also offers a range of settings for layout, page numbers, headers, and more, making it a comprehensive tool for vertical text creation and editing.