Vault - CM12 Theme is a personalization application for Android 9.0. Developed by Gustavo F. Santos, this free theme is exclusively for the CyanogenMod 12 Theme Engine. The program offers a variety of overlays, including Framework, System UI, AOSP Keyboard, CM Browser, CM Filemanager, CM Updater, CM Music Player (Eleven), CM Sms, CM Theme Manager, Contacts, Phone, Gallery, Settings, Sound Recorder, Google Play Store, Google Play Music, Google Plus, Google Gmail, Google Keep, Google Hangouts, Google Youtube, and WhatsApp. It also features the Quicksand font and MMII icon pack from stalker018, and Morphiz Skin Family ringtone.

The overlays consist of switch, scrubber, buttons, colors, and styles, providing a wide range of customization options. The program is easy to install and use, with a straightforward interface that allows for quick access to all the features. However, users must keep in mind that this theme is only compatible with the CyanogenMod 12 Theme Engine. Overall, Vault - CM12 Theme is an excellent choice for those looking to personalize their device with an extensive range of customization options.