You can get it for free from the BigBoss repo. It works on all iOS devices including iPhone, iPad and iPod touch.
It recently got updated with full support for iOS 7. YoutubeToMp3 is not a new app as it has been available on the iOS platform since iOS 6. Wait until the conversion is completed and download the file. After entering the URL, BestMP3Converter will analyze it automatically, if it has no response, click on 'Convert' button manually. From the ‘All Songs’ page you can also delete, rename and share files you have downloaded using the application through email. Instructions Insert YouTube link into the search box and click 'Convert' button. After getting the MP3 versions of your favorite video you can either listen to through this app’s built-in audio player, which also lets you create playlists or export that audio file to your device’s Music app. The best thing about this Cydia app is that you don’t need your computer at any point. With YoutubeToMP3 you can convert any Youtube’s video into MP3 format and download them on your iOS device. Click on the orange-colored download button.
Now go to Ace Thinker (a YouTube to MP3 converter), and paste the URL that you’ve just copied. Aimersoft Music Recorder detects the music.
Play the music on the website or in the application. Click the 'Record' button that is on the top left corner. Set the output into mp3 format from the format tab. Follow the steps mentioned below: Step 1. Launch the Aimersoft Music Recorder and click the top bar menu of the program to open the drop box menu. That’s only true if you are not jailbroken as for the rest us a Cydia app called YoutubeToMp3, which makes this possible. This is one of the easiest ways to convert music videos from YouTube to mp3 on iPhone. So there’s no way you can download video or audio from Youtube on your iPhone or iPad. Just like the Youtube website, the official Youtube app for iOS does not allow users to download the audio on their devices. You can get some easily available apps on the internet that can provide your music from YouTube. A lot of apps are available on the internet that can do this job. On computers there are several unofficial tools available that enable users to download the audio from their favorite videos. To download YouTube files as MP3 music, you will first need an app that can convert YouTube videos to MP3. Sadly, Youtube does not allow viewers to download video or audio from its website. Youtube is the biggest library of online video however it can also be a great source of audio as well.