Shadow video with your subtitles
on top.
Find study-grade subtitles from fellow learners, shadow them line by line in the desktop player, and hear exactly how close you got.
Free · no account needed to browse.
Subtitles are curated and shared by fellow learners — no transcribing.
The browser extension runs only on YouTube, Netflix & The Economist — no screen, mic, or camera recording, no trackers, no ads. It just saves your display settings and reuses your existing login. Read the privacy policy →
One loop, three surfaces
Extension
Auto-load and capture subtitles on YouTube, Netflix, and The Economist.
One account across all three.
Everything you need to shadow, in one place.
Subtitles on the videos you watch
A browser extension auto-loads community subtitles on YouTube, Netflix, and The Economist — and shows the platform's own captions when none exist yet.
A library you build together
Browse subtitles other learners have polished, and add captions from any supported video back to the library in one click.
Loop a line, then shadow it
Repeat any line until you can say it, then shadow it in the desktop player and get a 0–100 score for how close your sounds and melody came.
Subtitles in many languages
Study subtitles in English, Japanese, Korean and more — SRT and VTT both work. (Pronunciation feedback is English, for now.)
Intonation you can see, word by word
Shown in the desktop player. Pronunciation feedback is English; phoneme scoring is still in beta.
Each word is drawn with size for loudness and color for pitch — your line stacked next to the original, so the invisible music of English becomes something you can read and copy.
Size = loudness
The bigger the word, the harder the speaker leans on it.
Color = pitch
Warm for high notes, cool for low — the melody of the sentence.
Reference vs you
Your line sits right under the original, so the gap is obvious.
What the loop feels like
Capture subtitles where you watch
On YouTube, Netflix, or The Economist, the extension finds community subtitles automatically — or grabs the platform's own captions when there aren't any.
Loop a line and shadow it
Repeat the exact line you're stuck on in the player, then say it back and see how close your pronunciation and melody came.
Find it, shadow it, see how close, share it back.
Find a subtitle
Search the library, or capture one from your browser on a supported video.
Shadow the line
Loop each line in the desktop player and say it until it feels natural.
See how close
Get a 0–100 score, with pronunciation and intonation you can actually see.
Share it back
Add the subtitles you polished to the library, so the next learner starts ahead.
Free to learn. Pro when you want the cloud.
- Browse & share subtitles on the web
- Offline shadowing in the desktop player
- Local pronunciation & text-to-speech
- Cloud pronunciation scoring
- Natural cloud text-to-speech voices
- Cloud subtitle generation (per-word pitch & prosody)
- Cloud AI chat & voice tutor
Everything local stays free on your account.
In their words
I can finally hear the gap between my intonation and a native speaker's — and close it. One line a day actually stuck.
Pulling subtitles straight from the videos I already watch killed the friction. I practice on the train now.
The pronunciation score gave me something concrete to chase. My /r/ and /l/ are finally improving.
Questions, answered
Is it free?
Browsing and sharing subtitles is free. The desktop player has a free offline mode; the richest cloud pronunciation feedback is a Pro feature.
Which videos work?
The browser extension supports YouTube, Netflix, and The Economist. The desktop player works with videos you already have.
Which languages are supported?
Subtitles come in English, Japanese, Korean and more. Pronunciation and intonation feedback is English for now.
Do I need to install anything?
Browse subtitles right here on the web. Shadowing with feedback happens in the desktop player, and the browser extension adds capture on supported sites.
I built Emergence because I was tired of watching endless English without ever sounding more like it. Shadowing worked for me — I just wanted it to be measurable.
Your line of the day — start now.
Get the desktop player →Free offline mode — your audio and practice stay on your device.