So Smart Apps brings you the مكتبة أحمد بن حنبل 22 كتاب, a free Android application that gives you access to a vast collection of Islamic literature. The app features a search function that allows you to search through all the books in the library, as well as a separate search function for each book and chapter. The app also allows you to change the font size, color, and style of the text, and choose from hundreds of background colors and images. Moreover, the app offers a range of menus, including a list of the main books, a list of the chapters in each book, and a favorite list for both books and chapters. The app also features a note-taking function, and the ability to copy and share any part of the text. Overall, مكتبة أحمد بن حنبل 22 كتاب is an excellent resource for anyone interested in Islamic literature and history.