Master 6,000 Essential Words & Complete Grammar (A1–C1)
Learn languages effectively with proven cognitive methods. Combine the 6,000 most frequent words using the 5-level Leitner spaced repetition system with a complete grammar curriculum from beginner (A1) to advanced (C1).
Available Language Courses
Complete self-study packs with 6,000 frequency-ranked words and interactive grammar lessons.
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How It Works in 3 Simple Steps
A clear, structured path to building lasting vocabulary and grammar fluency without distractions.
Choose Your Course
Select your native language and target language pack with 6,000 core words and structured CEFR grammar topics.
Practice Actively
Type translations with smart typo tolerance or use self-grading flashcards, listen to native pronunciation, and solve gap-fill drills.
Retain Forever (SRS)
The 5-box Leitner algorithm schedules reviews at optimal intervals (1, 2, 4, 7, and 14 days), transferring words into long-term memory.
Vocabulary & Grammar Engineered for Retention
Built on Ebbinghaus's forgetting curve and active recall principles.
📊 6,000 Frequency Words
Curated from linguistic corpora so you learn the most useful everyday and academic vocabulary first, covering over 95% of real-world texts.
🔁 5 Leitner Boxes (Spaced Repetition)
Correct answers promote a card to a higher box with a longer review interval (1, 2, 4, 7, 14 days). Mistakes reset it to Box 1 for immediate reinforcement.
⌨️ Typing Mode with Typo Tolerance
Active recall through typing strengthens spelling. Our Levenshtein distance checker forgives minor keyboard slips (1 typo per 4 characters).
🔊 Web Speech API Pronunciation
Listen to every word and grammar example with configurable voice, playback speed, and automatic speaking triggers.
Why Learn With Flashcards?
Designed for serious learners: fast, distraction-free, and respectful of your time and data.
🎯 Grammar From A1 to C1
Every grammar topic combines concise theory rules, contextual examples with audio, fill-in-the-blank drills, and multiple-choice quizzes.
☁️ Local Storage & Cloud Sync
Your progress is saved instantaneously in your browser and synchronized across all your devices when signed in, with full JSON backup export/import.
⚡ Fast & Ad-Free Interface
No ads, no popups, and no gamified bloat. Keyboard shortcuts and mobile-friendly controls let you review dozens of cards in minutes.
🌍 Multilingual Interface & RTL
Study in your native language with full support for Latin, Cyrillic, Arabic/Urdu RTL, Devanagari, and East Asian scripts.
Frequently Asked Questions (FAQ)
Answers to common questions about the Leitner method, courses, and progress synchronization.
How does the 5-level Leitner system work?
Every word starts at Level 0 (new). When you answer correctly, it moves up to Level 1–5 with increasing review intervals (1, 2, 4, 7, and 14 days). If you make a mistake, the word returns to Level 1 and is also repeated within the current session.
How does typo tolerance work in typing mode?
Case, punctuation, and apostrophes are normalized automatically, and up to one typo per 4 letters is accepted as a close match (highlighted in yellow) so small keyboard slips never reset your streak.
Can I export or back up my learning progress?
Yes! In Settings you can export your entire vocabulary, grammar, and custom flashcard progress to a JSON file at any time and import it on another browser or device.
What is included in each language course pack?
Each course pack includes 6,000 frequency-ranked words translated into your native language, searchable dictionary with audio pronunciation, and a full CEFR grammar curriculum with interactive drills and quizzes.
Start Building Lasting Language Fluency Today
Explore available language packs or sign in to continue your daily spaced repetition session.
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Available courses
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Course Store
Lifetime access to 6,000 words and full grammar curriculum.
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Course
Leitner box distribution (0-5)
Each word moves through levels 0–5 (Leitner system). Correct answers promote the word and increase the review interval; wrong answers reset it to level 1.
Session complete 🎉
| # | Word | Translation | Level |
|---|
Grammar topics
Topic
Settings
Study Session & Practice Mode
In typing mode, capitalization and apostrophes are ignored, and up to one typo per 4 letters is accepted as correct (highlighted in yellow).
Pronunciation (Web Speech API)
Automatic Pronunciation Triggers
Choose when words are spoken automatically during study sessions. The 🔊 button always works regardless of these toggles.
Account Security
Change the password for your account below.
Data Backup & Reset
Export your learning progress for the active course to a JSON file or restore it from a backup file.