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Freetube is the best way to watch YouTube
(www.popsci.com)
This is a most excellent place for technology news and articles.
No Android version of it yet, eh? Damn.
ETA: I previously tried Vanced, but it didn't work correctly.
Try GrayJay, works great in my experience and has all the stuff (background play, no ads, downloads, etc). One issue I had with ReVanced was casting didn't always work for me, GrayJay seems to be able to cast to my shield without missing a beat.