What are some alternatives?
When comparing 4k Video Downloader and yt2mp3.org, you can also consider the following products
youtube-dl - A small command-line program to download videos from https://alternativeto.
Youtube-DLG - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Point MP3 - Pointmp3 is one of the best and an easiest online tool that helps you to converts your favourite tracks on YouTube to the mp3 format that is of the highest quality.
Video DownloadHelper - DownloadHelper is a tool for web content extraction.
Peggo.tv - Peggo is a free YouTube to mp3 converter online.
Freemake Video Downloader - Freemake Video Downloader downloads videos from YouTube & 10,000 more sites. Absolutely FREE. Download YouTube in HD, MP4, MP3. **Voted best of 2018**.