X-Reader is a versatile app designed for iPhone users to read various document formats like txt, epub, pdf, mobi, and more. It offers a seamless reading experience with features such as iCloud sync across multiple devices, full-text search, customizable reading settings, and support for multiple languages. Users can import and export local books, take notes, and utilize text-to-speech functionality. The app also allows for easy file access and management, supporting features like drag-and-drop, keyboard shortcuts, and iCloud sync for reading progress and bookmarks.

X-Reader provides a user-friendly interface with options for dark mode, custom fonts, themes, and page layout adjustments. With support for different turning animations and reading page customization, it caters to individual reading preferences. Additionally, the app offers a range of convenient features like direct file opening, multi-window support on iPad and Mac, and various import/export options from popular cloud services.