Transcript
Stay inside the line you are hearing.
The key to fluency is consistent practice.
You need to immerse yourself in the language.
Loop the line, slow it down, and watch it again until it lands.
Language Learning, Reimagined
LearnEnglishfrom YouTube
Paste any video. Click any word. Build vocabulary, practice grammar, and sharpen pronunciation — all in one place.
No account needed · Works offline · Free
Featured clip
Hear natural English land in a real moment.
08:22
Real videos
Search real captions
Explain in context
Review what sticks
Vocabulary·AI Chat·Spaced Repetition·Caption Search·Grammar Practice·Pronunciation·Offline First·No Account·Vocabulary·AI Chat·Spaced Repetition·Caption Search·Grammar Practice·Pronunciation·Offline First·No Account·
Search real English.
Millions of captions.
Find any word or phrase used naturally by native speakers across millions of YouTube videos. See it in context, hear the pronunciation, understand the usage.
Live demo data is unavailable right now. Open the search workspace to try it directly.
Exact:
"give up"Gap:
get _ upWildcard:
learn*Boolean:
accent OR dialect0+
Matches found
0+
Videos matched
0+
Indexed videos
Everything you need to learn from video
Four tools working together. Click a word to look it up. Chat with AI about it. Save it for review. Practice until it sticks.
01
Vocabulary
Click any word in the captions. See definitions, pronunciation, examples — instantly. Save words to review later with spaced repetition.
02
AI Chat
Ask questions about any word, phrase, or grammar point in the video. The AI sees the same captions you do, so answers always match the context you're watching.
03
Caption Search
Search across millions of YouTube captions. Find any word or phrase used naturally by native speakers. Hear it pronounced, see it in real context.
04
Practice
Grammar drills and cloze exercises generated from the videos you watch. Review saved vocabulary with SM-2 spaced repetition.
Three steps. That's it.
📋
01
Paste a URL
Any YouTube video with captions. Talks, interviews, vlogs, lectures — whatever interests you.
👆
02
Watch & click
Click any word in the captions. Get instant definitions, chat with AI, and save to vocabulary.
🧠
03
Review & practice
Spaced repetition brings words back when you're about to forget. Grammar drills cement the patterns.
See it in action
Your YouTube classroom
One clip turns into transcript study, AI explanation, and spaced review. The interface stays quiet so the language stays central.
Open the study workspaceExplain
AI
Review
Queue
12
Saved words waiting for their next review.
Practice sets
3
Grammar and cloze drills generated from watched videos.
Flow
Watch, save, review, then go back to the next real example without switching tools.
Frequently asked
Learn English with YouTube, answered
Everything you need to know about turning any YouTube video into an interactive English lesson.
How do I learn English from YouTube videos with Looplines?
Paste any YouTube URL into Looplines. The player loads the real caption track with word-level timing, so every word is clickable for an instant AI explanation, dictionary lookup, or native-audio replay. Save words to a vocabulary list that syncs offline and schedules reviews with the SM-2 spaced-repetition algorithm.
What are interactive captions?
Interactive captions are synced subtitles where every word is selectable. In Looplines, clicking a word pauses the video, opens a dictionary tooltip, and offers AI context drawn from the surrounding sentence. You can loop any line, slow playback, toggle bilingual translations, and send the line to the AI study panel.
Is Looplines free to use?
Yes. Looplines is free and requires no account to start. You can bring your own API key for OpenAI, OpenRouter, or a custom provider for unlimited AI features, or use the built-in free tier for light usage.
Which YouTube videos work with Looplines?
Any public YouTube video that has captions — either human-written or YouTube's auto-generated track — works. Looplines fetches the caption file directly, parses it with word-level timing, and indexes it for full-text search across videos you and other learners have opened.
How is Looplines different from YouGlish?
YouGlish lets you hear a word in YouTube clips. Looplines goes further: you can open the full video in an interactive player, search captions across thousands of videos with FTS5 ranking, save words to a spaced-repetition deck, generate AI practice exercises, and track listening time on a learning dashboard.
Does Looplines work offline?
Partially. Your vocabulary, notes, watch history, and AI conversations are stored locally in IndexedDB and persist across sessions without a network connection. Playing a video itself still requires YouTube; caption search and AI explanations require a network round-trip.
What AI features does Looplines include?
Looplines can explain any word or phrase in context, translate captions line-by-line or in bulk, generate grammar drills and cloze exercises from a video, produce a per-video study guide, and run a full conversational chat grounded in the transcript. All features stream via the TanStack AI adapter and support OpenAI, OpenRouter, Minimax, and custom OpenAI-compatible providers.
How does spaced repetition work in Looplines?
Every saved word is scheduled with the SM-2 algorithm used by Anki and SuperMemo. Review sessions rate each word Again, Hard, Good, or Easy — intervals then grow exponentially for easy items and collapse for forgotten ones, so your study time is spent on what you're about to forget.
Completely free.
No strings attached.
No account. No credit card. No tracking. Just paste a video and start learning. Your data stays on your device.
Works in any modern browser · Offline capable