Before every flashcard you rate how sure you are, and overclaiming on a card you get wrong costs you double.
For each term, first stake your confidence from 1 to 5, then reveal the answer and judge yourself honestly. The scoring rewards being right when sure and punishes confident misses, building real self-calibration.
Confidence Cards is built on probability calibration, rewarding you for knowing how sure you really are.
Staking a confidence level from one to five before revealing the answer is calibrated probability assessment: scoring not just whether you were right but whether you knew how likely you were to be right.
Rewarding being right when sure, and punishing being wrong when sure, is the original scoring.
That measures metacognition rather than knowledge. Most people are overconfident in a measurable way — things they call certain turn out true rather less often than certainly — and a scoring rule that prices confidence is the only way to see it in your own answers.
Confidence Cards is an original free browser study game built on the idea of probability calibration, where rating your own certainty matters as much as knowing the answer. It trains you to know what you actually know.