What is spaced repetition and how does Vunolin use it?

Spaced repetition is the idea that you remember something better if you review it just before you would have forgotten it.

How it replaces classical review:

• Instead of reading the same chapter ten times in a row, you see it again the next day, then three days later, then a week later.
• The gaps grow as the memory holds; they shrink again when you start forgetting.

How Vunolin applies it:

• Tracks how confidently you handled each question in your quizzes.
• Uses that signal to slot weaker concepts back into upcoming lessons earlier than stronger ones.
• You spend more time on what you almost forgot, less on what you already know.

Plan differences:

• Pro and Teacher run automatic spaced repetition.
• Super gets the basic version; Free gets sequential review without the adaptive timing.

For how progress metrics work, see How scoring works.