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The FSRS Algorithm
Experience how the Free Spaced Repetition Scheduler optimizes your memory in real-time.
Stop guessing. Start knowing.
Legacy SM-2 algorithms used by older apps are rigid. They treat every card and every brain exactly the same.
FSRS changes everything. It's an optimizer that calculates the exact mathematical probability of you remembering a card, tailoring the schedule to your unique learning curve.
- Reach 90% retention with 20% fewer reviews.
- Optimize for your specific test date.
- Adapt instantly to hard material vs easy material.
Retention Probability over Time
See it in action
Step through a real-world flashcard learning scenario to see how FSRS adapts vs standard algorithms.