Traditional tests measure accuracy, but ignore effort. This suite measures automaticity.
Using a vanilla JS adaptive engine and Log-Likelihood Ratios (LLR), it navigates 24 CEFR sub-levels in real-time. By analyzing response latency, it identifies a "Cognitive Ceiling"—the point where mental effort peaks even if answers remain correct.
Features:
• Adaptive A1–C2.2+ ladder
• Distinguishes lucky guesses from mastery
• Open-source & privacy-first
