I’m currently developing a App called Derfin MP3 Downloader. It’s a tool that allows the user to download music from youtube. The App converts the video into MP3 and saves it to the user’s mobile phone.
The app allows downloads via writing or pasting the URL into the App or using the “sharing” menu when selecting a youtube-link.
The first public release will be online within the next few hours. You can download the App: