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Lokia
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How it works

How Lokia works from video to long-term memory

Lokia combines a browser extension and the web app to help you capture vocabulary from videos and retain it over time.

Use the browser extension on YouTube

On YouTube videos with subtitles, click any subtitle word to translate it instantly and save it to your account in one flow.

Lokia browser extension showing interactive subtitle translation

Pick videos from Discover or use your imported videos

Discover gives you ready-to-learn videos, and imported videos appear in your account too. This is where you choose what to study next.

Lokia Discover page with available videos to add and review

Review subtitle videos with color-coded knowledge

Inside the Lokia player, subtitle words are color-coded by your knowledge level, so you instantly see what is known and what still needs practice.

Lokia video player with interactive subtitles and word-level coloring

Review words with intelligent FSRS flashcards

Words added from videos (or other sources) can be reviewed with FSRS flashcards to maximize retention over time.

Lokia flashcard review screen with FSRS answer buttons

Track FSRS stats from the flashcard session screen

Before starting a session, you can see useful FSRS tracking stats (counts, due cards, and progress indicators) to monitor your learning.

Lokia flashcard session start and progress statistics

Revisit everything in My Words with your own levels

You can also review vocabulary directly in word lists, filter by level, and assign your own knowledge level to each word.

Lokia My Words page with level filters and vocabulary list

Keep practicing with mini-games

After your reviews, you can train the same vocabulary with mini-games to strengthen recall in a faster and more playful way.

Frequently asked questions

No. You can use the app without the extension thanks to the built-in video library available for many languages. The extension is optional and helps you capture extra vocabulary directly from YouTube.

Yes. You can import videos from the extension directly to your account, then find them in the app and continue learning there.

Yes. Saved words sync with your account, so your vocabulary and progress stay available across sessions.

Ready to learn with this full workflow?

Create your account and start learning from videos you already watch.