Language Reactor is an absolutely incredible tool along these lines: https://www.languagereactor.com/ https://www.languagereactor.com/ I've been using it with

Language Reactor is an absolutely incredible tool along these lines: https://www.languagereactor.com/ https://www.languagereactor.com/ I've been using it with Netflix and YouTube to study a couple of languages, with really good results. The gist is that it adds dual-language subtitles, translation/dictionary tools, precise subtitle-based playback controls etc to the player UI. It can also colour-code every word based on its frequency in the language and on whether I already know it or am actively trying to learn it. This makes it very easy to identify common words I don't yet know and make them the focus of my vocab learning. The main shortcomings (for me) are: 1. Word translations are sometimes weird (but then I can get to a real dictionary with two clicks). 2. It does not understand grammar (e.g. separable prefixes in German). 3. Different forms of the same word are sometimes treated as unrelated words for the purposes of colour-coding (e.g. the infinitive and Präteritum for some verbs). 4. Word frequency highlighting (e.g. highlight the 1500 most common words) is configured globally rather than per-language. 5. TurtleTube sounds cool but I find the contents a bit meh and the levelling inconsistent. I have found a couple of great YouTube channels through it though. 6. Local file playback requires an SRT file and can only play the default audio track. The former is no biggie but the latter completely breaks the feature for me (since the default audio track is usually English and not the language I'm learning). 7. Plex integration would make it even more useful. But overall, what an amazing tool.