The best program to download videos from YouTube? Well, since you're asking, many would probably say that it's aTube Catcher, also considered by many as the best program to download music as you can use it to extract the audio from the videos that are shared on this site and many other portals.
And the fact is that the software previously known as YouTube Catcher is the best program to download videos from Google's video hosting site and from others of the likes of Vimeo, Facebook, Dailymotion... you can even download porn videos from adult sites.
aTube's version for Android?
So, who wouldn't want to download the application of this program to his smartphone or tablet to be able to get hold of a local copy of all these online contents? That would be great if there was an official Android app. The thing is that this application hasn't been created by the developers of the original PC program (just take a look at the official page), they've just taken advantage of its name to release their own app (in fact, you probably already know that there's not even an aTube Catcher for Mac, at least not an official one).
This one is an application to extract audio from videos and convert it to MP3, so you can use it to download songs of the likes of Despacito by Luis Fonsi, or any other music created by the best musicians in the world. We're obviously talking about Justin Bieber, Ariana Grande, and Shakira, amongst others.
You're supposed to be able to download music from YouTube. But only supposedly.
The APK of this application can be downloaded for free... but it doesn't look like you're going to find it very useful because it doesn't even connect to the servers. In other words, its problems go way beyond the typical error socket of the Windows version or error 403 and other classics of this video download client: it basically doesn't work. But don't worry because as an alternative, you can always make use of TubeMate YouTube Downloader, which is definitely much better.