Retention - Flashcards

Stop wasting hours studying only to forget everything a week later.

Retention uses scientifically proven spaced repetition to help you remember anything - languages, medical terms, history, code, or any knowledge that matters to you. Study smarter, retain longer, and finally build the knowledge that sticks.

SCIENCE-BACKED LEARNING

Our brains aren't designed for cramming. They're optimized for spaced repetition—reviewing information at increasingly longer intervals, right before you forget it.

Retention implements the SM-2 algorithm, refined over 30+ years of cognitive science research. It calculates the perfect moment to review each card, transforming short-term cramming into permanent knowledge.

The result? Learn in half the time with better retention.

HOW IT WORKS

1. Create flashcards or import from Anki
2. Study and rate your recall (Again, Hard, Good, Easy)
3. Retention schedules your next review automatically
4. Difficult cards appear more frequently
5. Mastered cards space out into long-term memory

The algorithm adapts to you. Your personal learning curve determines when you see each card next.

PRIVACY YOU CAN TRUST

Your flashcards never leave your control.

Everything stores locally on your device or syncs through your personal iCloud account. We don't collect data. We don't track usage. We don't have servers storing your information. We literally cannot see what you're studying.

Your knowledge is yours. Period.

OBSIDIAN INTEGRATION

For knowledge workers and note-takers: Retention integrates seamlessly with Obsidian vaults.

Create flashcards directly in your markdown notes using simple syntax. Edit anywhere—Retention or Obsidian—and changes sync bidirectionally. Your vault remains your single source of truth while Retention handles the spaced repetition magic.

EVERYTHING YOU NEED

• Scientifically optimized spaced repetition (SM-2)
• Clean, distraction-free interface with dark mode
• Rich media—add images and audio to any card
• Multiple formats: basic cards, Q&A, markdown
• Progress tracking with streaks and heatmaps
• Study analytics to understand your learning
• Import Anki decks (.apkg) with full history
• 5 languages: English, Ukrainian, Spanish, Portuguese, Chinese

WHO IT'S FOR

Medical students memorizing thousands of terms. Language learners building vocabulary. Developers learning new frameworks. Studen