"40 Rabbanas" is a free Android application that provides a collection of 40 Duas (invocations) from the Quran that begin with the word "rabbana - رَبَّنَا" (Our Lord). The application is designed for users who want to learn and recite these Duas with ease.

The app displays each Dua in Arabic with its translation in several languages and transcription. The audio is also available for each Dua. With the help of this app, users can easily learn the Duas and their meanings, and recite them with ease.

Overall, "40 Rabbanas" is a useful application for those who want to learn and recite Duas from the Quran. The app is compatible with Android 9.0 and is available for free on the Google Play Store.