There’s also yattee for iOS, which works with invidious and Piped too https://github.com/yattee/yattee

I can confirm Orion blocks Youtube ads (might need to tweak options). As for youtube app, no need to sideload anything, Yattee is on the app store and on testflight for betas (https://github.com/yattee/yattee/wiki/Installation-Instructions)