I've tryied TubeBuddy and I deleted it after some hours of usage. As I am experienced YouTuber, all the functions that I tested in the free version are already done manually for each video and I found no big use of this app. Don't get me wrong. If I was a beginner I would love to use TubeBuddy and get more insight of YouTube, but for me it was just slowing down my browser. I saw some features in the paid version that can come handy to me but I don't think the monthly subscribtion will give enough new views for making it worth.