There are lots of alternatives, but none that we've found to be as good - or as good value. iTubeGo offers a basic interface, but which can download playlists and 4K videos. It is one of the cheapest options

El descargador de YouTube de iTubeGo permite la descarga de vídeos en 4K y Full-HD y te permite convertirlos fácilmente en varios formatos. Lo mejor de todo es que también sirve para descargar vídeos de otras webs, no solo de YouTube. También tienen una app para Android.

iTubeGo is one of the most complete downloader programs for YouTube and 10,000 websites with HD video streaming. It lets you download all kinds of content, including videos up to 8K, high-bitrate MP3 audio, channels, playlists, podcasts, subtitles as SRT files, even offline.