Re: best video downloading app w/playlist feature
Technically, yes. From the MoNa Community Guidelines:
Originally Posted by zackscudder87
Supporting or encouraging the use of services that allow content downloading from YouTube does violate copyright law in the U.S., though it's by no means a black-and-white issue. YouTube sent out letters threatening legal action against some of the common 'conversion' sites in 2012, for what that's worth.
Keep it Legal - Moderators and admins reserve the right to close threads and ban members that post copyrighted and/or illegal materials. These kinds of activities can get us into trouble, and nobody wants that... so just don't do it. If you have questions on this, ask a moderator.
I'd recommend searching the Play Store if you're looking for an app. If you look at third-party apps from unofficial sources, be careful. Somewhere between one in ten and one in three apps on third-party app stores are likely malware of some sort.