What are some alternatives?
When comparing Yout and Threelly, you can also consider the following products
CONV. - Convert YouTube video to MP3, GIF or MP4
YTBmp3 - Terminated.
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
YouTube GIF Creator - Turn any video into a GIF directly inside YouTube
Youtube-Loader.eu - Convert your Youtube Videos to other Formats.Mp3 (64kps-320kbs), Mp4, WEBM, 3GP, FLV, 3GP
Tubenab - Discover and convert YouTube videos to MP3 & MP4