Best Dua app
This app does not only contain fortress of duas but has the audio for each one of them, also the reference or the daleel of the hadith(s) or ayah(s) where the dua is mentioned. To make it even better you will find comments of the muhadith scholars like Sh Albani rahimullah and many more scholars by each hadith they commented on.
Best app for dua
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myDuaa: Fortress of a Muslim | حصن المسلم, v1.5.1