Looking for mac youtube downloader and converter got any advice?

I'm looking for a good MAC youtube downloader that converts in different formats.
Has anyone used any video converters for mac that can give me a recommendation?

I used to use vixy but it's becoming very sketchy works part of the time..
Thanks in advance

Maybe usefull its online converter. Not mine

I'm wanting to get info on something someones used as a mac user. I've seen that one and looked it's a monthly service and they have ads on the cheaper service. I appreciate your input though..