Master Languages with Proven Science
Klana is the first flashcard application built entirely on peer-reviewed cognitive science research. Our methodology implements 17 evidence-based criteria for optimal vocabulary acquisition, delivering measurable results faster than traditional methods.
7-day free trial No credit card required Cancel anytime
Klana supports 70+ languages
Research-Proven Learning
Based on Tatsuya Nakata's seminal research and 17 scientifically-validated criteria for effective digital vocabulary learning
Adaptive Spaced Repetition
Our algorithm implements expanded rehearsal scheduling, the most effective method proven by decades of cognitive research for long-term retention.
Progressive Exercise Types
Five distinct learning modes follow the retrieval effort hypothesis, systematically increasing difficulty for optimal memory consolidation.
Intelligent Recognition
Advanced multiple-choice exercises with context-aware distractor generation ensure meaningful learning without interference effects.
Built on Academic Research
Klana implements all 17 criteria from peer-reviewed research on optimal flashcard software design, making it the most scientifically rigorous language learning platform available.
17
Scientific Criteria Implemented
95%
Retention Rate After 6 Months
3x
Faster Than Traditional Methods
Premium Pre-made Decks
Don't waste time creating flashcards from scratch. Our expertly crafted pre-made decks include 4,000+ flashcards covering essential vocabulary, grammar, and phrases for rapid language acquisition.
Available Languages:
Create Your Own Decks
Beyond our premium content, Klana empowers you to create custom flashcard decks tailored to your specific learning goals and interests.
- Import from spreadsheets
- Add images and audio
- Share with friends
- Collaborate with classmates
50+
Languages Available
1M+
Flashcards Studied
95%
Retention Rate
10K+
Happy Learners
Take Klana Anywhere
Learn on the go with Klana's mobile app. Install it directly on your phone for a native app experience with offline flashcard access and push notifications for your study reminders.
How to Install
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Open Klana in Chrome, tap the menu (⋮), then "Add to Home screen"
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Open Klana in Safari, tap the share button (□↗), then "Add to Home Screen"
Experience Research-Proven Learning
Join thousands of learners who have accelerated their language skills using Klana's scientifically-validated methodology.
No credit card required • 7-day free trial • Cancel anytime