Spaced Repetition Vocabulary Tool

Never forget a word you look up. Bellek uses spaced repetition to show you words right before you'd forget them — turning passive reading into lasting vocabulary.

Add to Chrome — Free

Why Spaced Repetition Works

Learning a word once isn't enough. Research consistently shows that reviewing information at increasing intervals — right before you'd forget it — is the most effective way to move knowledge into long-term memory. This is spaced repetition.

The problem? Most people don't have time to manually schedule reviews. That's where Bellek comes in.

How Bellek Uses Spaced Repetition

Bellek's flashcard system is built on spaced repetition algorithms that work automatically:

Words you know well appear less frequently — no wasting time on what you've already mastered
Words you struggle with appear more often, right before you'd forget them
Difficulty adapts based on your responses — the system learns your patterns
Mastery tracking shows you exactly where each word stands
Streak tracking with better time estimates keeps you motivated and consistent

More Than Just Flashcards

Unlike standalone flashcard apps, Bellek combines spaced repetition with a complete vocabulary learning system:

Learn from Real Content

Save words while browsing any website — including mixed-language pages. Every word captured with the sentence where you found it and the source URL.

Translations in 20 Languages

Set your preferred language and see translations alongside English definitions. Saved with the word for review.

Your Own Notes

Add memory cues or custom definitions right in the popup before saving.

Organized Collections

Group words by topic, course, or project. Study one collection or all at once.

Multiple Choice Quiz

Multiple choice quizzes test active recall, not just recognition. (Premium)

Smart Review

A focused mode that only shows words you've marked as difficult. (Premium)

Track Your Progress

Your dashboard shows daily streaks, mastery percentages for each word, weekly goals (choose from light to intensive), session history, and personalized insights. See at a glance which words are mastered and which need more practice. The combination of spaced repetition, quizzes, and smart review creates a complete retention system — not just a flashcard app.

Import Existing Lists

Already have vocabulary in Anki, Quizlet, or spreadsheets? Import via CSV and Bellek applies spaced repetition to those words too. Combine imported lists with words you save while browsing.

Study on Any Device

Scan the QR code from your desktop dashboard to get a unique sync URL. Open it on your phone or tablet to study anywhere — no app download required. Toggle the definition popup on or off from the extension icon so Bellek stays out of your way when you're not studying.