مجربات الديربي الكبير is an educational book for Android users, developed by Rif3i. The book is compiled by Sheikh Ahmed Al-Derby Al-Shafii, and its content is derived from the book Majaribat Al-Sheikh Abu Abdullah Mohammed bin Yousuf Al-Sanusi Al-Hasani. The book contains numerous supplications and verses that are beneficial for Muslims, along with their explanations and benefits. The book is divided into thirty-six chapters, each focusing on different verses and supplications. Some of the chapters include the benefits of reciting Surah Yasin, Surah Al-Mulk, and Surah Al-Waqiah, among others. The book also includes chapters on the benefits of reciting specific verses and supplications to address various issues such as headaches, fever, and childbirth. The book is an excellent resource for individuals who want to deepen their knowledge of Islamic supplications and verses. The app is free to use and available for download on the Android platform.