For iOS/mac, I love the Vinegar extension. It’s great for stripping YouTube down to just the video, provided you use Safari instead of the YouTube app. It also regularly updates. Yes, I know there are free ways to do this (it’s $1.99), but this is more about convenience and supporting a dev.
It’s been absolutely fantastic for me, I keep recommending it to friends but they don’t like the $1.99 price and yet keep getting upset when ads play. I’ve started replacing apps with safari links on my home page and YouTube is one of them thanks to vinegar.