The التهذيب في فقه الإمام الشافعي app developed by So Smart Apps is an Android book reading app that offers a wide range of customization options to enhance the reading experience. The app features 8 different Arabic fonts with the option to change the font size and color. It also offers hundreds of background colors and dozens of themes to choose from, along with a selection of background images.

The app allows users to switch between full-screen and normal mode, and enables comfortable night-time reading. Users can easily navigate between chapters using the sidebar menu, and can move between chapters using the arrows at the end of each chapter. The app also allows users to adjust the line spacing and alignment of the text and to jump directly to the top or bottom of the page.

The app offers multiple interaction options such as copying and sharing complete chapters or sections of text. It also enables users to search for specific words within chapters or throughout the entire book. Users can save their last read location, notes on any chapter, and favorite chapters, and can even reset the app's settings to their default values.