حلية الأولياء وطبقات الأصفياء is an Islamic reference book developed by So Smart Apps. This Android application is a free resource that provides users with the opportunity to access a comprehensive collection of Islamic knowledge. The app features a search function that allows users to search for specific information within the book as well as within specific subcategories. Users can also search for information within specific sections of the book. The app offers users the ability to change the font size, color, and style of the text, and also provides a variety of background colors and images to choose from. The app has a user-friendly interface that includes a list of main sections, chapters, and a favorites list. The app also allows users to take notes and share information with others. With its extensive features, حلية الأولياء وطبقات الأصفياء is an excellent resource for anyone interested in Islamic studies.