Learning Science

Most learning apps skip the research. LearnClash builds on four decades of cognitive science: the testing effect (Roediger & Karpicke 2006) shows active recall beats re-reading by 50%, spaced repetition (Ebbinghaus 1885; FSRS 2023) multiplies long-term retention, and competitive skill-matching through ELO (Elo 1960) keeps learners in their flow state. These articles explain how each mechanism works and how LearnClash combines them into a single 3-minute-a-day routine.

Learning Science May 19, 2026 21 min read

Why LearnClash Uses Prime-Number Question Counts

LearnClash uses prime-count question rounds (37, 43, 47, 53), not 50. The round-number tax and why round targets become exit cues.

Learning Science May 12, 2026 18 min read

Why We Threw Out the 1/3/7/21 Spaced Repetition Schedule [2026]

The 1/3/7/21 spaced repetition schedule has no academic source. Here's what real SRS algorithms do, and the 3-stage system LearnClash built.

Learning Science May 5, 2026 17 min read

ELO Matchmaking & Win Rates: Why Skill Matching Wins [2026]

ELO matchmaking pairs LearnClash duels by skill so each lands near the desirable-difficulty zone where retrieval becomes durable memory.

Learning Science April 26, 2026 18 min read

The LearnClash SRS Retention Curve: 3 Stages [2026]

LearnClash's 3-stage SRS retention curve: wrong cards return at 7 days, known at 90, then mastery exits the pool. Performance-based, not 1/3/7/21.

Challenge Your Friends

Master any subject through competitive 1v1 quiz duels. Free to play.

Learning Science April 26, 2026 18 min read

LearnClash by the Numbers [2026]: ELO, SRS & Design

How LearnClash works by design: ELO ladder, 3-stage SRS, composite matchmaking, prime question counts, and the Trivia Difficulty Index from 80,553 answers.

Learning Science April 20, 2026 19 min read

Does Quizlet Have Spaced Repetition? [Tested 2026]

Does Quizlet have spaced repetition? Yes, but free Learn caps at 5 rounds per set. See Plus, Anki FSRS-6, and LearnClash.

Learning Science April 20, 2026 23 min read

How to Study Effectively [9 Methods Ranked]

How to study effectively with 9 ranked methods. See why testing and spacing beat rereading, plus a 3-minute LearnClash routine.

Learning Science April 14, 2026 23 min read

How to Memorize Fast: 9 Science-Backed Methods [2026]

How to memorize fast: 9 science-backed methods ranked by encoding speed and 24-hour recall. Spaced retrieval beats rereading 2x. Tested.

Learning Science April 1, 2026 14 min read

Spaced Repetition: Never Forget What You Learn [2026]

Spaced repetition explained with the science, exact intervals, and how LearnClash builds it into competitive quiz duels.

Learning Science March 28, 2026 17 min read

Competitive Learning: Why Quiz Duels Work [2026]

Competitive learning has zero net effect on memory, unless designed right. ELO matching, retrieval practice, and flow make it work.

Learning Science March 26, 2026 18 min read

The Testing Effect: Why Quizzes Beat Rereading [2026]

The testing effect proves quizzing builds stronger memory than rereading. See how quiz duels and spaced repetition apply it.

Learning Science March 19, 2026 16 min read

ELO Rating System Explained [Complete 2026 Guide]

The ELO rating system ranks players by skill using win probability math. See how LearnClash quiz duels use it with 8 tiers, K-factors, and RD.