You must use a Nougat ROM that fully supports Substrate Themization! Works as well in stock / Rooted Oreo.
USE AT YOUR OWN ON A SAMSUNG DEVICE !!! does not work properly as far as I am aware.
+ Spotify
+ SuperSU
+ Sync for Reddit
+ SystemUI
+ Telecom
+ Teleservice
+ Textra
+ Twitter
+ WhatsApp
+ Youtube
Supported Android
Download Substratum Spectrum Theme 17.1.5 Patched APK For Android