The best alternatives to Youtube Master are Vimeo, YouTube-DJ, and YouTube Time Tracker. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
YouTube™ Time Tracker is an open source Chrome Extension that tracks time you watch Youtube. Unlike other extensions it doesn't track anything but time and keeps data only inside your browser.
This extension allows you to take control of your time and reduce distractions while browsing YouTube by hiding recommendations, comments (and live chats) trending/subscriptions pages end walls, and banner ads. These options are heavily customizable!
Clicker for YouTube TV is a standalone YouTube TV player for Mac. Features include launching YouTube TV right from your Dock, touchbar controls, picture-in-picture, live channel guide in the Menu Bar, dark mode, and much more.