Envelope is a lifestyle app developed by Special Projects - Experiments, available on Android. The app helps you take a break from your digital world by temporarily transforming your phone into a simpler, calmer device. The app is free to download and use.

With Envelope, you print and fold a special pdf into an envelope, which turns your phone into a very basic device. It can only make and receive calls, enabling you to focus on what's in front of you. Printed buttons subtly light up, allowing you to dial and take photographs, creating a calm but magical "Envelope User Interface."

Despite the paper layer, touch screens still work as they sense the capacitance of your finger, which is only slightly affected by the envelope. Existing functions such as fingerprint locking still function, and the user interface of the app is optimized for OLED displays, which means it won't drain your battery if it's on all day long.

It's worth noting that the app currently only supports Google Pixel 3a. Envelope is an open-source app, and all code is available on Github, making it an excellent choice for those who want to understand the code better. Overall, Envelope is an excellent app for those who want to take a break from their digital world, and we highly recommend it.