4K Video Downloader is a simple yet powerful tool that you can use to download YouTube videos on your Android phone. The user interface of the application is simple to understand.

To download a YouTube video to an iPhone, copy the link from the YouTube app, then use savefrom.net and Documents to save it to your device (Image credit: Readdle Inc) ...

7. YMusic YMusic is an app that enables you to download audio from YouTube videos. It is a simple and effective tool for saving music from YouTube, which can then be played offline.

Snaptube is a free Android app that allows users to save videos to their device. It has a simple interface and offers useful features to download and manage media files for offline use.