Paranoid Android

Paranoid Android is a custom ROM aiming to extend the system, working on enhancing the already existing beauty of Android and following the same design philosophies that were set forward by Google for Android Open Source Project.

More About Paranoid Android
Paranoid Android was founded by Paul Henschel.

In February 2015, OnePlus hired a handful of key members from the Paranoid Android team to work on its new OxygenOS. This caused delays to the release of Paranoid Android 5.1 builds.

In October 2015, team member Matt Flaming told Android Authority that the project would go on hold. In June 2016, the Paranoid Android team announced that they were back with new team members. This coincided with the release of a new version of Paranoid Android, which is based on Android 6.0.1 Marshmallow, with the May security patch, and includes new customization features.[6] On June 8, 2016, Paranoid Android supported Nexus 6P, Nexus 5X, Nexus 6, Nexus 5, Nexus 4, Nexus 7 2013, Nexus 9, OnePlus One, OnePlus 2, and OnePlus X.

On May 31, 2017, the team announced that they released the Nougat flavour of Paranoid Android. This version is based on Android 7.1.2 Nougat, with the most notable feature being the return of Pie Controls. Supported devices include the OnePlus 3 and 3T, Nexus 5X, Nexus 6P, Pixel, and Pixel XL.

Features
According to The Economic Times, the two most notable features of Paranoid Android are the Halo and the Pie. The Halo (not included in version 5.0 or greater) is a floating bubble that lets users see notifications without leaving the current screen, and the Pie is a replacement for onscreen navigation buttons that stays off screen and lets users swipe in from the edge to see the buttons.

Paranoid Android also features Substratum theme support support alongside their own Color Engine, accidental touch rejection, Pocket Lock (which prevents buttons being pressed in a user's pocket) and the ability to take a screenshot by swiping three fingers.