Memory Curve & FSRS
The theory and real-world results behind the FSRS spaced-repetition algorithm — how Loopy schedules reviews so words stick.
Why Do You Always Forget the Words You Memorize? Use the Memory Curve to Commit Them to Long-Term Memory
Forgetting the words you memorized after just a few days is completely normal—it's just how the brain naturally works. This article uses the science of memory to help you understand the forgetting curve and learn three methods—'spaced repetition,' 'active recall,' and 'memorizing words in sentences'—so that vocabulary truly sticks in your long-term memory.
Using Dictation to Practice Common Words: You Don't Truly "Know" Them Until You Reach 80% Accuracy
You understand common words at a glance, but when it comes to writing them down, you often miss letters or misspell them—listening comprehension and spelling are two different things. This article teaches you how to use dictation to practice them separately, and introduces a scientific standard to determine if you've actually mastered them: an 80% accuracy rate, practiced at least 3 times, is what counts as true mastery.
What Exactly Is the Memory Curve Calculating? Understand the Three Key Factors: stability, retrievability, and difficulty
You already know that "reviewing right when you are about to forget is the most effective," but how does the system calculate that perfect timing? This article breaks down the three keys behind the Loopy memory curve in plain language—retrievability, stability, and difficulty—so you can understand exactly why each vocabulary card prompts you to review on that specific day.