Hide
The concept definition is blurred so the answer cannot leak into your response.
Recall the idea, not just the wording
Recall Lock gives every important concept a private moment of effort. Explain what you remember, compare it with the lesson, and let that rating shape when the idea returns.
Why rereading can feel better than it works
When the explanation is visible, it is easy to recognise the idea and mistake that feeling for mastery. Retrieval practice removes the prompt. The useful question becomes: can you reconstruct the idea when the answer is not in front of you?
Research has found that practising retrieval can support meaningful learning and longer-term retention. That does not mean every study session should become a barrage of quizzes. The effort should appear at the right point and test something worth remembering.
How Recall Lock works
Explain
Write what you remember in your own words. Paraphrasing is welcome because understanding is not exact phrase matching.
Rate
Reveal the ideal answer and choose Got it, Almost, or Missed. Your rating schedules that concept’s next review.
Review the weak concept, not the entire lesson
Concept-level scheduling
A difficult idea can return sooner without dragging every mastered section back with it.
One clear action
Home shows a review prompt only when something is ready. It does not constantly advertise your memory state.
Forgetting Radar
Brain is the deliberate place to inspect due and overdue concepts when you want the detail.
Same schedule everywhere
Recall Lock, flashcards, and optional audio checkpoints feed the same concept review state.
Designed to stay low-key
The memory system is infrastructure, not the personality of every screen. After a rating, a short line can tell you when the idea is likely to return. In the library, only lessons with something due need a small badge. When nothing needs attention, Nodebook gets out of the way.