Spaced repetition is a learning technique where you review material at increasing intervals (e.g., 1 day, 3 days, 1 week, 2 weeks). This exploits the psychological 'spacing effect' to dramatically improve long-term memory retention compared to cramming.

Hermann Ebbinghaus discovered that we forget ~50% of new information within 24 hours and ~70% within a week. However, if you review the information just as you are about to forget it, you reset the curve, and the memory decay becomes much slower. This tool automates that timing for you.

This tool uses the scientifically standard intervals: Day 1 (Next Day), Day 3, Day 7, Day 14, and Day 28. This sequence is optimized for academic material.

Yes! Use the 'Archive' button (box icon) to hide topics from your active view without deleting their data. This is perfect for when you have finished a module or exam.

Your Mastery Score (top left) calculates the percentage of scheduled reviews you have actually completed. Aim for 80%+ to ensure you are sticking to the system and maximizing retention.

Yes, spaced repetition works for any subject requiring memory recall, including languages, medicine, history, law, and sciences. It is less effective for pure skill-based practice (like math problems), but still useful for remembering formulas.

Yes, everything is saved locally in your browser. You can close the tab and come back later. We also recommend using the 'Export Data' button regularly to keep a backup.

The planner will mark it as 'Overdue' (Red). You should do it as soon as possible. While not ideal, doing a review a day late is much better than skipping it entirely.

Yes, the Revision Planner is 100% free and open for all students.

Absolutely. We recommend adding the Subject Name (e.g., 'Biology') for each topic so you can easily scan your list.