The Hidd app, developed by Rigel Star, is an Android-based program that provides a curated list of unknown but useful websites. This app is designed to help users explore new sites that they may not have found otherwise. With Hidd, users can access links and descriptions of various websites even when they are offline. However, internet connectivity is required to browse the sites.

The user interface of the Hidd app is simple and easy to navigate. Upon opening the app, users are presented with a list of categories that they can use to filter the websites. The app does not require any personal information to use and is free to download. Overall, the Hidd app is a useful tool for those who want to uncover new and interesting websites.