Hcfyk

Is there a way to prevent YouTube from showing videos already watched in the list of suggested videos?

Currently, there is no treat/workaround to do so. Apart from manually block them one by one, there are no scalable solutions.

But there are extensions which can do so like:

• Chrome extension: Subscriptions Grid For YouTube™
  


• Chrome extension: YouTweak for YouTube™
  


• Chrome extension: YouTube Watched
  


• Chrome extension: Better Tube
  


• Chrome extension: Better Subscriptions for YouTube™ - (@Ashley)


• JS UserScript: YouTube: Hide Watched Videos
  

// ==UserScript==
// @version 1.1.1
// @name Hide watched videos on YouTube
// @namespace https://gist.github.com/xPaw/6324624
// @match https://www.youtube.com/*
// @updateURL https://gist.github.com/xPaw/6324624/raw/YoutubeHideWatched.user.js
// @downloadURL https://gist.github.com/xPaw/6324624/raw/YoutubeHideWatched.user.js
// @grant none
// ==/UserScript==

const app = document.querySelector( 'ytd-app' );

function HideVideos( a )

 app.querySelectorAll( 'ytd-thumbnail-overlay-resume-playback-renderer:not([data-hidden="true"])' ).forEach( element =>
 
 element.dataset.hidden = true;

 while( ( element = element.parentNode ).tagName.toLowerCase() !== 'ytd-item-section-renderer' )
 
 // Find the container element for this video
 

 element.hidden = true;
 );


function ProcessPage()

 if( !window.location.pathname.startsWith( '/feed/subscriptions' ) )
 
 return;
 

 const list = app.querySelector( 'ytd-section-list-renderer' );

 if( list.dataset.hooked )
 
 return;
 

 list.dataset.hooked = true;
 list.addEventListener( 'yt-next-continuation-data-updated', HideVideos );

 // TODO: Find an event to fix this
 new MutationObserver( HideVideos ).observe( list, childList: true, subtree: true );


app.addEventListener( 'yt-navigate-finish', ProcessPage );

ProcessPage();

AFAIK, there's no way to do this on YouTube itself, but I use a Chrome extension (Better Subscriptions for YouTube) that lets you hide watched videos from your subscriptions tab.