FreeTube
An Open Source YouTube app for privacy
...Subscriptions, playlists, viewing history, and other user data are stored locally on the user’s machine rather than on remote servers, giving users full ownership over their content preferences and histories. The app provides many features similar to the official YouTube experience — such as subscribing to channels, exploring trending content, and organizing playlists — while also offering privacy-centric options like using Tor or external proxies and hiding elements via distraction-free settings.