The 36 Questions Challenge, developed by Bettr Labs, is an Android app based on psychologist Arthur Aron's study that helps strangers develop closeness through mutual vulnerability. The app presents users with a series of 36 questions that gradually become more intimate. The questions are designed to be answered with a partner, and the app provides a platform for users to connect with others who are also looking to build closeness and intimacy.

The app's interface is user-friendly and easy to navigate. Users can create a profile and browse through potential partners based on shared interests. The app also offers tips on how to approach the questions and encourages users to be respectful and considerate of their partner's feelings throughout the process.

Overall, the 36 Questions Challenge is a unique and engaging app for those looking to build deeper connections with others. It's free to use and offers a fun and interactive way to get to know someone on a more personal level.