Stuck on something, found a bug, or want to push back on a design choice? We read every message.
Most questions are about why a card came back, what "mastered" means, or how units unlock. The Help page walks through all of it.
Read the Help docs →Four answers that cover most questions.
Why do I keep seeing cards I already got right?
That is spaced repetition working. One correct answer is not memory — it is a reading.
What do Again / Hard / Good / Easy actually mean?
Self-assessment grades that change when the card comes back. Grade honestly or the schedule lies to you.
How do units unlock? What is the 90% gate?
A unit unlocks when 90% of the previous unit's cards reach "in review" status. Not full mastery — just enough foundation to build on.
Will I ever get stuck or blocked from advancing?
No. Units unlock one-way. Once you have it, you keep it. What changes is how much older material gets mixed back in.
Full answers on the Help page.
Three things make a bug report actionable.
Signed in? Use the feedback form on your Profile page — it tags your account automatically.
For everything the form doesn't cover — hello@masteryhelp.com. Billing, subscription questions, curriculum suggestions, account recovery.
A mastery-learning platform: whatever the subject, it is built to take you all the way. Spaced repetition, and cards that keep coming back until you've proven you know them. Read the mastery philosophy if you want the long version of why we built it this way.