The app creates a localhost connection that is proxied to a 'back-end' p2proxyd service. It's useful for if you have some self-hosted service that you want to control through a web-interface, but don't want to, or are able to, open ports and expose a static-ip for that service/device.
The app code is licensed under GPLv3, and the source code can be found here https://github.com/MarcusGrass/p2proxy
Feature graphic generated with https://hotpot.ai/design/google-play-feature-graphic.