OnLeitner: Flashcards & Review

Memorize anything with the Leitner system, the spaced repetition method students use to remember more while studying less.

OnLeitner is free, with no ads and no limits. Create as many boxes and cards as you need.

HOW IT WORKS
Create a box for each subject or topic and add question-and-answer cards. Every card moves through 5 levels: get it right and it moves up and comes back later; get it wrong and it starts over. Your time goes to what you actually find hard.

ONLY WHAT'S DUE TODAY
Each study session shows only the cards you need to review today, most overdue first. When you're all caught up, OnLeitner tells you when your next review is, and you can always review everything anyway.

WHO IT'S FOR
• High school and university students preparing for exams
• Anyone studying for certifications or civil service exams
• Language learners building vocabulary
• Anyone who wants to remember concepts, dates, formulas or definitions

TIP: CREATE YOUR CARDS WITH AI
Have your notes in a PDF? Export a sample box as JSON, give it to your favorite AI along with your notes, and ask it to write the cards in the same format. Import them into OnLeitner and start studying in seconds.

FEATURES
• Leitner method with 5 spaced repetition levels
• Sessions with only the cards due today
• Mastered cards marked with a star
• Automatic iCloud sync across your devices
• Import and export boxes as JSON
• Export any box to PDF to print it
• Boxes with custom colors
• Native Liquid Glass design for iPhone and iPad
• VoiceOver and Dynamic Type support
• Available in English and Spanish

YOUR PRIVACY
No accounts, no ads, no tracking. Your cards live on your device and in your iCloud, nowhere else.