Why did I lose a heart?
Hearts protect you from speed-running through lesson quizzes. Wrong answer in a lesson, lose a heart. Hit zero and lessons pause for 30 minutes per heart you need to regen.
Free accounts have five hearts. You lose one for every wrong answer inside a lesson quiz. Hit zero and lessons are paused for thirty minutes per heart you need to recover.
The reason hearts exist is to make you slow down on the lesson questions. The cost of getting a question wrong should be felt, otherwise the brain treats them as guesses and the testing-effect benefit doesn't fire. The friction is the feature.
Pro hearts
Pro accounts never run out of hearts. Get every question wrong in a row, the lesson keeps moving. The reasoning: by the time you're paying $20 a month you've probably internalised that wrong answers are the path to learning, and you don't need the brake.
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