WiFi Password Viewer does not discover WiFi passwords! WiFi Password Viewer shows only the password of the WiFi networks you have been connected to! Some devices (eg Samsung) encrypt WiFi passwords, so no app can display them clearly. To display them, follow the instructions in the in-app welcome alert dialog or here: android.stackexchange.com/questions/95923/decrypting-wpa-supplicant-conf-on-samsung-galaxy-mobiles. Thanks for the collaboration.
Required Android Versions : Jelly Bean [4.1–4.3.1] - KitKat [4.4–4.4.4] - Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]