Requirements: Android 6. 0. X Stock Rom OR Android 6. 0. X Layers compatible custom Rom NOT CM13. Layers Manager 4. 4. X. Xhdpi, xxhdpi or xxxhdpi device, most things should work on lower densities too. Outline contains about 65 Overlays: 35 Overlays for Third Party Apps. 20 Overlays for Google Apps. Overlays for 10 System Apps. To see which apps are themed have a look.