Flashcards for math and science
7 decks, 53 cards. Flip a card, say how well you remembered it, and spaced repetition schedules the next review: cards you miss come back soon, cards you know wait days.
Make your own deck Type your own cards with formulas, study them now, and save them to your account.
Key limit facts, continuity conditions and the theorems you are expected to name.
Every basic differentiation rule on one deck.
Formulas and rules that come up in every algebra course.
Exact sine, cosine and tangent values at the special angles.
Vocabulary for describing data, sampling and inference.
Moles, concentration, gases and pH.
Constant-acceleration equations and Newton's laws.
How spaced repetition works
After you flip a card you grade yourself: Again, Hard, Good or Easy. The deck uses the SM-2 schedule. A card you miss comes back in the same session; a card you know is pushed out to tomorrow, then about a week, then further each time you get it right. Easy cards space out faster, hard ones slower.
Short daily sessions beat one long cram, because each review happens just as you are about to forget. Your progress is stored in this browser only, so use the same device and browser to keep your schedule.
Prefer worked examples? Try the study guides or practice problems.