This application is a sweet recitation of Surah kahf. Syrah kahf is the 18th surah of the Holy Quran.It has hundred and ten ayats.
By reciting surah kahf every Friday Allah will save you from the Djal and forgive your sins for the past.
Hazrat Muhammad (SAW) said, "Whoever recited Surah Kahf in the same manner in which it was revealed, it will serve for him as a light on the Day of Judgment, from his domicile to Makkah. And who ever recited the last ten verses, and it happens that the Dajaal should appear after that, Dajaal will not be empowered over him." (Al-Hakim 1/564 & Adh Dhahabee).
Hazrat Muhammad(SAW) said Whoever recites Surah Kahf on the day of Jummah(Friday), there will be a Nur brightened for him between two Jummahs(Between two Jummas).