"Hisnul Mumin" is an Android application developed by Smart eDevelopers, falling under the category of Education & Reference, and subcategory Books. It is a collection of supplications and invocations of the Prophet sallAllahu alaihi wasallam with proofs from the Quran and the Sunnah. The app is based on a book by the Noble Shaykh Abu Abdir-Rahman Abdillah bin Ahmad Al-Iryaanee.

The app offers a wide range of features, including English Translation for all Duas, improved search facility, easy reading of Duas, and an option to add Duas to bookmarks. With no need for an internet connection, the app is easy to use and provides the option to change the language of the app to either English or Arabic. Furthermore, users can share individual Duas or Chapter-wise with friends and family.

Overall, "Hisnul Mumin" is a comprehensive collection of authentic Du'as that is easy to use and provides a wide range of features to enhance user experience.