# Lokia - Language Learning Platform > Learn languages through YouTube videos with interactive subtitles and spaced repetition. Lokia is a modern language learning platform that transforms YouTube watching into an effective learning experience. Users can click on subtitles to get instant translations, save words to their vocabulary, and review them using flashcards with spaced repetition (FSRS algorithm). ## Features - **Browser Extension**: Available for Chrome, Firefox, and Edge. Enable dual subtitles on YouTube to see the original language and translation together, and click any word for instant lookup. - **Spaced Repetition**: Review vocabulary at optimal intervals using the FSRS algorithm. Available for free with flashcards. - **Vocabulary Building**: Save words from videos and organize them in custom wordlists. - **Context Learning**: Learn words in real context from authentic content. - **Progress Tracking**: Monitor your learning journey with detailed statistics. - **Over 50 Languages**: Support for learning over 50 different languages. ## Pricing - **Free Plan**: Unlimited subtitle translations (extension + in-app video library), flashcards with spaced repetition, vocabulary saving - **Full Access (Premium)**: Unlimited wordlists, mini-games, import your own videos ## Links - Website: https://lokia-app.com - Chrome Extension: https://chrome.google.com/webstore/detail/lokia - Firefox Add-on: https://addons.mozilla.org/firefox/addon/lokia - Contact: contact@lokia-app.com ## Documentation - /en - English homepage - /fr - French homepage - /en/pricing - Pricing plans - /en/download-extension - Browser extension download - /en/contact - Contact support - /en/signup - Create account - /en/login - Sign in - /en/about - About the creator