Study Subs — dual subtitles for YouTube

Two subtitle tracks at once — original above, translation below — plus sentence-by-sentence shadowing for language practice.

Study Subs turns any YouTube video with subtitles into a language lesson. It opens a full-screen study overlay with two subtitle rows: the original track sits on a fixed reading line so it never jumps around, and its translation sits right below it. Both appear word by word, in time with the speaker. SHADOWING MODE Shadowing means repeating a sentence out loud right after the speaker until it sounds natural. Turn on Study and the video stops by itself at the end of every sentence — no hunting for the pause key. Then: • Repeat — play that same sentence again, from its start • Next / Previous — move one sentence at a time • Play — after a sentence has played out, Play replays it instead of running on Sentences are detected by punctuation, not by how YouTube happened to split the captions into lines, so one sentence stays one sentence. PICK UP WHERE YOU LEFT OFF Study Subs remembers the sentence you stopped at. Come back to the video and it offers to continue from there, and marks the spot on the scrubber. BUILT FOR PRACTICE, NOT FOR WATCHING • Playback speed from 0.5x to 2x, in steps • A scrubber whose notches are sentence boundaries — click to jump to the start of a sentence, never into the middle of one • Text size from XS to XL, three themes (Sepia, Dark, Light) • Translation into uk, en, pl, de, es, fr, it or ru — switch it mid-video • Hide the translation row with one click when you want to try without it • Keyboard: Space play/pause/replay, Left/Right previous/next sentence, R repeat, Esc exit • Subtitles are cached on your device, so re-watching a video needs no network request at all HONEST ABOUT THE LIMITS • Translation is YouTube's own auto-translate. It is readable, not literary. • The video must have YouTube subtitles. If the text is burned into the picture, there is nothing to read. • If captions are switched off in the player and it doesn't pick them up automatically, turn CC on once by hand. PRIVACY Nothing is collected and nothing leaves your computer. No accounts, no analytics, no trackers, no third-party services, no backend of ours. Your settings, the subtitle cache and your study bookmark live in the browser's local storage on your machine; requests go only to youtube.com, the site you already have open. Full policy: https://cinexua.github.io/study-subs/privacy.html Study Subs is an independent extension. It is not affiliated with, endorsed by, or sponsored by YouTube or Google LLC.