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Lokia
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Master Languages ThroughReal Content

Transform your favorite YouTube videos into powerful learning experiences. Build vocabulary naturally with context-rich learning and intelligent spaced repetition.

Learn from over 50 languages including:

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Start Learning Free
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Learn Languages the Natural Way

Watch videos you love, click on any word for instant translation, and build your vocabulary effortlessly. Lokia transforms your screen time into learning time.

  • Click any subtitle word for instant translation
  • Track your progress with streaks and statistics
  • Review vocabulary with smart flashcards
  • Works on desktop and mobile, light and dark mode
Lokia app interface showing YouTube video with interactive subtitles and instant word translation popup
Lokia mobile dashboard showing learning streak calendar, progress statistics and vocabulary tracking

Powerful Features

Learn Through Context

Watch videos you love while learning. Our extension provides instant translations and helps you discover new words naturally.

Smart Spaced Repetition

Master vocabulary with the FSRS algorithm. Review words at optimal intervals for long-term retention.

Custom Wordlists

Create personalized vocabulary collections. Search, translate, and organize words that matter to you.

Context-Rich Learning

See words in multiple contexts with example sentences. Understand usage patterns and nuances.

Browser Extension

Transform any YouTube video into a learning opportunity. Click subtitles for instant translations.

Progress Tracking

Monitor your learning journey with detailed statistics and progress indicators for each word.

Lokia Extension

1

Interactive Subtitles

Click any word or phrase in YouTube subtitles to get instant translations and definitions.

2

Save to Wordlist

Add discovered words directly to your personal wordlists for later review.

3

Smart Progress Tracking

See your knowledge level for each word displayed right in the extension.

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Available on Chrome, Firefox & Edge

Free extension • Works with any YouTube video

Download Now
▶youtube.com/watch?v=...
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Lokia
Subtitles

The key to success is consistent practice.

La clé du succès

Bonjour

Click to reveal

Bonjour

Hello

Again
Hard
Good
Easy

谢谢

谢谢

Thank you

Again
Hard
Good
Easy

Hola

Hola

Hello

Again
Hard
Good
Easy

FSRS Algorithm
Powered Learning

Our spaced repetition system uses FSRS (Free Spaced Repetition Scheduler). Scientifically optimized intervals ensure you review words at the perfect moment for long-term retention.

  • Adaptive scheduling based on your performance
  • Long-term memory optimization
  • Efficient study sessions

Frequently Asked Questions

Yes! The free plan includes unlimited subtitle translations (via the extension and the in-app video library), flashcards with spaced repetition, and vocabulary saving. The premium plan unlocks unlimited wordlists, mini-games, and the ability to import your own videos.

Lokia supports over 50 languages: Amharic, Azerbaijani, Bulgarian, Bengali, Cantonese, Catalan, Czech, Danish, German, Greek, English, Spanish, Estonian, Persian, Finnish, French, Hebrew, Hindi, Croatian, Hungarian, Indonesian, Icelandic, Italian, Japanese, Georgian, Korean, Lithuanian, Latvian, Malay, Mandarin, Dutch, Norwegian, Polish, Portuguese, Romanian, Russian, Slovak, Slovenian, Albanian, Serbian, Swedish, Swahili, Tamil, Thai, Tagalog, Turkish, Ukrainian, Urdu, Vietnamese, Zulu.

Lokia uses the FSRS algorithm to schedule your reviews at optimal intervals. Each word is shown at exactly the right moment to maximize long-term retention with minimal study time.

Yes, the extension works with any YouTube video that has subtitles available. Click any word to get an instant translation and save it directly to your vocabulary.

The Lokia extension is available for Chrome, Firefox, and Edge. The web app works on any modern browser.