#1
ProTube Android | YouTube Vanced App + Skip Ads + Download MP4 and M4A (Google AdMob)
Disclaimer: This app is pretty risky. If it is not possible to publish on the playstore, you can promote the app through the website. We do not guarantee that it can publish on Playstore because we are using an application that can download YouTube videos.
#2
YouMate - Download Audio/Video From YouTube (Android Studio Source Code)
You can download audio/video from the internet 100% free and very easily just with a few clicks using Krishna Downloader App. It is a high-speed downloader for your Android device. This video downloader app can help you download and save HD Videos with just one tap. Extremely fast, safe and 100% free! All video formats and different resolutions are supported.
#3
Videmak SupaTube | All in one; Videos, Audio, Lyrics, Stream and Download
The logic behind this app is that you can think of a beautiful audio song, so you come to this app and search for it, of course, it will be there, You start streaming it (It has unlimited audio streams). Now you want to download the song (It has an inbuilt audio downloader). But now you like the song and want to watch its video, still we got you (It has an inbuilt song video search with downloader), Other things like song Lyrics are just bonus.