La citadelle du musulman is an Android application developed by Ousmane Abdoulaye that falls under the category of Education & Reference and subcategory of Books. The application is free to download and use. It is an Islamic reference book that provides guidance and advice to Muslims on how to live their daily lives according to the Quran and the Sunnah. The name of the book, La citadelle du musulman, means "The Fortress of the Muslim," and is a compilation of various invocations and supplications that a Muslim can recite in different situations.

The application is user-friendly and easy to navigate. It has a menu that allows the user to select the specific invocation or supplication they want to recite. The application also provides the Arabic text, transliteration, and translation of each invocation or supplication. The application is a great resource for Muslims who want to learn more about their religion and improve their understanding of the Quran and the Sunnah.