Swift Dark is a Substratum theme with 200+ handcrafted overlays, using a selected shade of dark gray for the backgrounds and preserving the apps original accent and primary colors wherever possible. It supports the following systems: Android AOSP-based ROMs Nougat, Oreo, Pie and Android 10. OnePlus Oreo, Pie and Android 10. Samsung Nougat, Oreo and Pie. Nexus Nougat and Oreo.