aospUI Gray, Substratum Dark theme+Samsung,Synergy

AospUI Gray theme matches exactly the colors and user interface that Google made for Android N second preview, extended on more apps, it's "the old" O/Pixel Dark Mode. The theme installs through an app that this app will link you to, where you will have to buy an add-on made by Substratum developers). The theme supports: Samsung, AOSP based, OnePlus and Google systems.