Built on how memory actually works
Spaced repetition and active recall aren’t features we invented. They’re two of the most replicated findings in learning science. Here’s the honest version.
Memory decays. Timing beats it.
In 1885, Hermann Ebbinghaus measured how quickly he forgot what he had just learned: steeply at first (most of it gone within days), then levelling off. That shape, the forgetting curve, has shown up in memory research ever since.
The curve isn’t destiny. Each well-timed review resets retention, and the next decay runs shallower. Space the reviews and the curve flattens until the material stays put. Try it: add a few reviews to the chart.
The forgetting curve
0% retained after 30 days
0 of 4 reviews scheduled
Expanding intervals beat cramming
Cramming feels productive because re-reading is fluent. The material looks familiar, so it feels learned. But reviews spread over expanding intervals (a day, three days, a week, a month) build far more durable memory for the same total study time.
In 2006, Cepeda and colleagues pooled 254 studies in a Psychological Bulletin meta-analysis and found the same pattern everywhere: distributed practice reliably beats massed practice, across ages, materials, and test delays.
Source: Cepeda et al. (2006) · 254 studies · Psychological Bulletin
Testing yourself beats re-reading
Re-reading shows you the answer; retrieval makes you produce it. That small struggle is where memory is built. Every attempt to recall strengthens the trace you will need later.
Roediger and Karpicke (2006, Psychological Science) had students either re-study a passage or test themselves on it. A week later, the testers retained far more than the re-readers. Reviewing the evidence in 2013, Dunlosky and colleagues rated practice testing and distributed practice the two most effective study techniques of the ten they examined.
Sources: Roediger & Karpicke (2006) · Dunlosky et al. (2013)
How AnkiCat applies it
Two findings, two mechanisms. The rest is the app doing the bookkeeping.
The algorithm schedules each review
Every card’s next review is planned for the moment you’re about to forget it: the distributed-practice part, handled for you. Rate how it went and the interval stretches.
Exam-mode quizzes force retrieval
Quizzes make you answer from memory before you see anything: the practice-testing part, built in. Recognition is never accepted as knowing.
No app makes learning effortless. AnkiCat removes the busywork and the guesswork. The effortful part is what makes it work.
Read the originals
The claims above are old, replicated, and checkable. Start here.
- Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). Distributed practice in verbal recall tasks: A review and quantitative synthesis. Psychological Bulletin, 132(3), 354–380. https://doi.org/10.1037/0033-2909.132.3.354
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255. https://doi.org/10.1111/j.1467-9280.2006.01693.x
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students’ learning with effective learning techniques: Promising directions from cognitive and educational psychology. Psychological Science in the Public Interest, 14(1), 4–58. https://doi.org/10.1177/1529100612453266
- Ebbinghaus, H. (1885/1913). Memory: A Contribution to Experimental Psychology.
See the loop in action
The research is settled. The only variable is whether you start.