KBChan by KanjiBreakdown

Companion to KanjiBreakdown Web and Windows Apps. Learn Japanese by breaking down any text on the web, and add selectable Japanese subtitles to videos on Crunchyroll, Netflix, YouTube, and more. Connects with KanjiBreakdown Desktop App and KanjiBreakdown.com to show popup sentence and kanji breakdowns with dictionary definitions, recommended learning order, personal memory aids, shared mnemonic stories, and add items to your SRS learning lists, review known items and more! Learn Japanese with native content and optimized efficient self learning!

Will automatically use Japanese subtitles from the current stream when available, or you can automatically search for Japanese subtitles matching your content or even drag and drop your own custom subtitle files.

Subtitle sidebar support:

Crunchyroll
Netflix
Amazon Prime Video
Stremio Web
local video files in your browser

Subtitles only support:

YouTube