This is very interesting! Would definitely be useful non-technical users. I have a few UX concerns, though.

- By default, it's set to All Features instead of Basic Features

- The app repeatedly says it doesn't upload your files, yet there's a big button in the app saying Upload File. Perhaps "Your files are never uploaded" should be reworded to something like "Your files never leave your device"?

- It also was not obvious how to get started with the app. Perhaps some text could be added to the play button?