Hike uses a memory-based spaced-repetition schedule. A question becomes mastered after your latest real answer is correct and its estimated memory stability reaches 21 days.

Sprint uses that same question history, then prioritises new, due, and at-risk work to maximise expected recall on your chosen exam date. “Mastered for the date” is a separate, date-specific estimate; it does not lower the durable mastery bar.

Postpone hides a question from Learn for 21 days. It does not count as mastery, record an answer, earn answer credit, or change its FSRS state. Your next genuine answer clears the postponement. After answering, you can undo it until you move on.