This is not for Sam-sung or OOS stock roms! Know how to recover your device before using Subs as I take no responsibility for what you do to your device! I can only test on Nexus and Pixel devices but this should work on any device with a custom AOSP Rom with Substratum support. Pixel 2 users using 8.
TheRealBigJake is the developer of the app which is related to the Personalization category. Over 1K users set up Dark Infusion Substratum Theme for N, O and Pie and the latest update was launched on Oct 26, 2019. According to the latest data, this application is rated 4.8 on Google Play.