Learn languages by shadowing real audio.
Import podcasts, YouTube videos or your own audio. Reactor transcribes with AI, highlights every word as it is spoken, translates and explains — so you listen, repeat, and actually speak.
Free at launch. No spam, ever.
- 8
- languages to learn
- 14
- interface languages
- 1 tap
- from podcast to lesson
EN → PT
walking the dog
passeando com o cachorro
World Cup English Vocabulary…
Learn English Podcast ›
Welcome back. Today we're talking about a habit you already have.
You'relisteningtoapodcastrightnow.Driving,workingout,walkingthedog.
You're listening to a podcast right now. Driving, working out, walking the dog.
If you're into podcasts, chances are you have something to say too.
01Features
Everything you need to go from listening to speaking
Real content beats textbook dialogues. Reactor turns the audio you already love into an interactive lesson.
Word-by-word karaoke subtitles
AI transcription with per-word timing. Follow the audio like karaoke and never lose your place.
Learn English Podcast · 03:12
RootbeerisoneofthemostpopularsodasintheUnitedStates.
A root beer é um dos refrigerantes mais populares dos Estados Unidos.
Tap any word or sentence
Meaning, grammar highlights, vocabulary and example sentences from an AI tutor, right in the player.
…one of the most popular sodas…
popular adj.
liked or enjoyed by many people
Instant second subtitle
A clean translation in your language under every line — on when you need it, off when you don’t.
Import anything
Podcasts, YouTube videos or your own audio files. If you can play it, you can learn from it.
Echo Mode for shadowing
Listen to a segment, record yourself repeating it, and compare — the fastest path to natural pronunciation.
Polished, ad-free transcripts
Smart cleanup removes ads and transcription glitches so you study the content, not the noise.
Welcome to Chicago, Chicago.
02How it works
How it works
Three steps from “I found a cool podcast” to “I can say that.”
01
Import your audio
Paste a YouTube link, pick a podcast episode, or upload your own file.
Import audio
02
AI builds your lesson
Transcription, word timing, translation and explanations are generated automatically.
Transcribing
Translating
Explaining…
03
Shadow and speak
Repeat segment by segment with Echo Mode until it sounds like you.
Native
You
03Shadowing
Shadowing is the shortcut.
Polyglots have used it for decades: listen to native audio and repeat it out loud, matching rhythm and intonation. Reactor makes the loop effortless —
- Auto-pause after each sentence
- One-tap record & compare
- Slow down audio without losing pitch
- Repeat a segment until it sticks
Echo Mode REC
Listencarefullyandrepeatafterme.
04Languages
Learn 8 languages. Use it in 14.
Interface available in 14 languages, including Portuguese, Arabic, Russian, Thai, Turkish and Vietnamese.
05Waitlist
Be first in line.
Join the waitlist and get early access — plus founding-member perks when we launch.