The [Substratum] Xperia Lockscreen Clock is a free personalization theme designed for Android devices running Nougat, Oreo, or Pie. This theme allows users to switch between two distinct clock styles typical of Xperia devices, enhancing the visual appeal of the lock screen. It requires the Substratum application to apply the theme and is compatible with various custom ROMs, including AOSP, LineageOS, and Resurrection Remix.

Installation of the theme necessitates OMS support for Nougat and a rooted device or Andromeda for Oreo and Pie. It is important to note that stock ROMs are not supported, and users are advised against applying the theme on devices running stock Oreo to avoid potential system crashes. The theme also supports custom fonts, though it is recommended to use the default font included with the theme for optimal results.