I'm author of that tool. It allows iPhone/iPad users to convert list of YouTube URLs to RSS feed, compatible with native Podcasts application.

This feed works fine also with other podcast/videocast apps on any iOS/Android device (tested on few Android apps also).

All videos added to that feed (feeds are editable) are automatically downloaded to phone/tablet.

By default, 360p video is downloaded, but user is able to change quality to 720p (if available) on 'edit feed' page.

My future goals:

- give users ability to personalize cover+description of newly created feed, then this feed could be sent to 'Apple Podcasts Connect' as new videocast

- support Youtube playlists/channels, not only direct video links

- support other video hosting services (like vimeo etc)