Beta · Language Reactor for the open web
Watch & learn
Watch any YouTube video with side-by-side captions, click words for definitions, save them to a deck, and study at your level. Curated learner channels in 4 languages.
🇬🇧English
Starter videos

Conversations in British Pubs — Easy English 225
Street interviews in UK pubs with bilingual subtitles.

Everyday Conversations with Strangers — Easy English 224
Real conversational English from the streets.

ADVANCED LEARNERS: Stop making these ADVANCED grammar mistakes!
British English grammar at advanced level with clear captions.

Are YOU Mispronouncing These 50 Common English Words?
Pronunciation drill of 50 common English words.

My Morning Routine: English Vocabulary Lesson
Conversational American English on a daily-life topic.

SPEAK With Me: English Speaking Practice
Interactive speaking-practice format with prompts.

Listening Comprehension — The Networking Elevator
Structured listening lesson with on-screen captions.

Improve Your English with Shadowing — Tongue Twisters
Shadowing technique for advanced English learners.
Channels worth following
VOA Learning English
beginnerVoice of America's slow-paced English news for learners, with reliable captions.
@voalearningenglish
BBC Learning English
allBBC's flagship English-learning channel — vocabulary, pronunciation, news in slow English.
@bbclearningenglish
Easy English
intermediateStreet interviews around the UK / English-speaking world — natural everyday speech with bilingual subtitles.
@easyenglishvideos
Rachel's English
allAmerican English pronunciation and accent training — extremely clear captions.
@rachelsenglish
English with Lucy
intermediateBritish English grammar and pronunciation — long-time favorite of intermediate learners.
@EnglishwithLucy
Speak English with Vanessa
allAmerican English conversation, pronunciation, and idioms — friendly and clear.
@SpeakEnglishWithVanessa
EnglishClass101
beginnerInnovativeLanguage's English channel — short structured lessons with on-screen captions.
@EnglishClass101
linguamarina
advancedVlog-style English content from a non-native speaker — relatable for advanced learners.
@LinguaMarina
🇯🇵日本語
Starter videos

"Duolingo Says ませんか is 'Would You Like To'?"
Native explanation of polite-form invitation patterns.

Still Saying あなた? Try This
When (not) to use あなた in real Japanese.

Seika's Favorite Book — Complete Beginner Japanese
Slow visual Japanese for absolute beginners.

Japanese Nursery Rhyme: Open Shut Them
Comprehensible-input lesson via a nursery rhyme.

Learn 80+ Japanese Words — Dragon Ball Z: Kakarot
Vocabulary and grammar through a famous JRPG.

Beginner Japanese with Ni No Kuni — N5/N4 Vocabulary
JLPT N5/N4 vocab through video games.

How to Know If Someone Likes You
Vlog-style conversational Japanese with bilingual subs.

ている/ています (To be -ing) TE Form Lesson Pt.2
Detailed grammar explanation of the te-form.

JLPT N3 Reading Practice — "Hanasaka Jiisan"
JLPT N3 reading comprehension through a folktale.
Channels worth following
Comprehensible Japanese
beginnerSlow, visual Japanese designed for input-based learning. Real subtitles, no English.
@cijapanese
Let's ask Shogo (Japan)
intermediateJapanese culture and language explained from a native perspective — clear captions.
@LetsaskShogo
NHK ニュース
allNHK's official YouTube — newsclips with captions; mix of natural and easy Japanese.
@nhk
That Japanese Man Yuta
intermediateStreet interviews and culture explainers — bilingual captions, conversational Japanese.
@ThatJapaneseManYuta
Game Gengo
intermediateLearn Japanese vocabulary and grammar via popular video games. Hugely popular in language-learning communities.
@GameGengo
Onomappu
intermediateJapanese culture and language vlogs at conversational pace — clear bilingual subtitles.
@Onomappu
Japanese Ammo with Misa
allDetailed grammar explanations from N5 to N2 — long-form lessons with thorough captions.
@JapaneseAmmowithMisa
🇪🇸Español
Starter videos

What's Your Apartment Like? — Easy Spanish 401
Apartment vocabulary via street interviews with bilingual subs.

11 Typical Colombian Expressions — Super Easy Spanish 142
Latin-American Spanish slang explained.

Spanish Story for Beginners: "Crash Diet"
Comprehensible-input story at beginner level.

Best Spanish-Speaking Movies You Need to Watch
Spanish cinema discussion at intermediate pace.

Practice Giving Time in Spanish 🇲🇽
Short structured time-vocabulary practice.

IR in the Present Tense — Mastering Spanish Verbs
Quick lesson on the verb 'ir' in present tense.

Learn to Exaggerate in Spanish
Mexican Spanish on natural ways to emphasize.

Have a Conversation in Spanish — 3 verbs to ask & answer
Conversational practice with three foundational verbs.
Channels worth following
Easy Spanish
allStreet interviews across Spain and Latin America — bilingual subtitles, real speech.
@easyspanish
Dreaming Spanish
beginnerComprehensible-input Spanish across all levels — clear Spanish-only captions.
@DreamingSpanish
Notes in Spanish
intermediateConversational Spanish from Madrid — proper subtitles for both speakers.
@notesinspanish
TED en Español
advancedTED talks delivered in Spanish — high-quality auto-captions and translations.
@TEDenEspanol
SpanishPod101
beginnerInnovativeLanguage's Spanish channel — bite-sized structured lessons with captions.
@SpanishPod101
Butterfly Spanish
intermediateConversational Spanish lessons from Mexico — natural pace with clear subtitles.
@butterflyspanish
🇫🇷Français
Starter videos

Slow French Conversations About Weather — Super Easy French 207
Slow, clear French for beginners on everyday topics.

We Asked the French About Their Last Photo — Easy French 257
Conversational French street interviews with bilingual subs.

E195 L'égalité en France, une illusion ?
Slow, intermediate French podcast on equality in France.

E194 Élections 2026 : qui dirige les villes françaises ?
Current-affairs French at intermediate pace.

A REAL French Conversation, Explained by a Native
Géraldine breaks down a natural French conversation line by line.

You've Heard Them 1000s of Times
Common French expressions analysed for non-native ears.
Channels worth following
Easy French
allStreet interviews around France — bilingual subtitles in French and English.
@easyfrench
InnerFrench
intermediateSlow, clear French podcasts on culture and society — great captions for intermediate learners.
@innerfrench
Français Authentique
intermediateReal-world French expressions and conversations — captions on every video.
@francaisauthentique
Piece of French
beginnerBeginner-to-intermediate French through stories and conversations.
@pieceoffrench
Comme une Française
intermediateReal French conversations explained for non-native speakers — Géraldine breaks down what you actually hear.
@CommeUneFrancaise
Phase 1 · what works today
- YouTube IFrame player + side-by-side caption strip pulled from YT's public timedtext feed
- Curated starter videos + recommended channels in 4 languages
- Paste any YouTube URL or video ID to watch + read captions
Phase 2 · coming next
- Click-to-define popovers (JMdict for 🇯🇵, Wiktionary for 🇪🇸/🇫🇷)
- Furigana ふりがな over kanji via kuromoji.js
- YouGlish-style word search across captioned videos