As of my last knowledge update in January 2022, "LokLok" was a unique and creative Android app developed by Kwamecorp. The app allowed users to replace their Android phone's lock screen with a shared whiteboard.
https://loklokapp.co/
This meant that you and your friends could draw and leave messages for each other directly on the lock screen, essentially turning it into a collaborative digital whiteboard.
Key features of LokLok included:
Real-time Collaboration: You could communicate with friends or family by drawing, writing messages, or sharing pictures directly on the lock screen.
Instant Messaging: It essentially replaced your lock screen with a messaging platform, allowing for quick and creative interactions.
Privacy: You could choose who could interact with your lock screen, ensuring that it's limited to a select group of people.