The الدعاء الذي لايرد قائله مجرب app by WAFAE ELKHATIRI is a free and easy-to-use educational mobile application designed for Android users. The app is a comprehensive collection of authentic supplications to be recited on various occasions, including the supplication that never fails to be answered, the supplication that shakes the throne of the Most Merciful, and the supplication for protection against envy. The app also contains various other supplications, including supplications from the Prophet's sayings, his advice, and verses from the Holy Quran.

The app is designed to help Muslims to seek Allah's mercy and blessings, and to provide them with authentic supplications that they can recite during different times of the day, from morning till night. It also includes various Islamic adhkar (remembrances of Allah) and the dua qunoot (a prayer recited during the Witr prayer). The app is user-friendly, with a high-quality design and is an excellent resource for those seeking to strengthen their relationship with Allah.