How does it work?
FreeTube uses the YouTube API to search for videos. It then uses the HookTube API to grab the raw video files and play them in a basic HTML5 video player, preventing YouTube from tracking that video. Subscriptions, history, and saved videos are stored locally on the user’s computer and is never sent out to Google or anyone else. You own your data.
The app is built using Electron as stated by the developer. I admire that he is being honest about using it.
The app is in beta and available for Linux, Mac and Windows.