Vidmate, snap tube, og youtube by ogmods.net
it simply helps us to download youtube videos at good speed( yes friends you might think that it provides the best speed no friends I will tell you
When a new person installs the app according to default settings the download speed in mentioned in bits/second (Mbps), but in the speed test websites the speed is mentioned in bytes(MBps).
Now 1Bytes= 8 bits
Even then the downloading option provided are good, the crashing option a in the app are very less that is very stable app . But teh options provided in the app are very less and can be improved as a whole there are many other better apps available .I would suggest vidmate(https://vidmate.en.uptodown.com/android/download) as a whole and newpipe(https://newpipe.en.uptodown.com/android/download) is also a very good option.