Physics problems are built from a small set of equations used in many combinations: Newton's laws, energy conservation, Ohm's law and the equations of motion.
Space Repeat keeps those equations, their units and their conditions at your fingertips, written in real notation instead of plain text.
Free to start. No credit card required.
Solving a physics problem starts with recognizing which principle applies and recalling its equation exactly. Students who get stuck usually aren't missing the math; they're missing the right starting equation. Spaced repetition makes the core equations, units and constants automatic, so your effort goes into modelling the situation.
New accounts can add starter decks for physics in one click, written with real notation. They're ordinary decks, so you can edit them, add your own cards, or import the ones you already have from a CSV file.
Shown the way Space Repeat shows them, formulas and all: one clear question, one short answer.
Question
Answer
Question
Answer
Question
Answer
Question
Answer
For each equation, put what it describes on the front and the equation, with units, on the back. Add a card for its conditions too, like "constant acceleration only".
Review your deck before working through problem sets, so choosing the right equation is quick and your time goes into the physics.
The algorithm tracks every card and shows it again right before you would forget it. No manual planning required.
Fractions, integrals, chemical equations and highlighted code look right on every card. Plain text works too.
Every feature, spaced repetition included, is free to use while Space Repeat is in beta. Early users will be looked after when pricing arrives.
Free to start. No credit card required.
Yes. New accounts can add starter decks for physics: Physics: Mechanics, Physics: Electricity and Circuits. They're ordinary decks, so you can edit, add or delete cards, and write or import your own alongside them.
Yes. Cards are a good fit for the equations, units and definitions those courses expect you to know, while practice problems build the problem-solving itself.
Knowing the core equations still pays off: you pick the right one faster, notice when an answer's units are wrong, and understand what each term means. Use cards for the meaning and conditions, not just the symbols.
Yes, it's free while Space Repeat is in beta, with up to 50 decks and 100 cards per deck.
How to Memorize Formulas (and When You Shouldn't)
Some formulas are worth knowing cold, some are better derived, and some can stay on the formula sheet. How to tell them apart, and how to make the ones you choose actually stick.
Active Recall: The Most Effective Study Technique (Backed by Science)
Most students study by re-reading their notes. Research consistently shows this is one of the least effective methods available. Active recall works differently, and the results are dramatically better.
Space Repeat vs Anki
Anki is the most powerful spaced repetition tool ever built. It's also one of the most frustrating to set up. Space Repeat was built for learners who want the same scheduling logic with a fraction of the friction. Here's how the two compare across the things that actually matter.
Calculus Flashcard App
Calculus flashcards with real notation for derivatives, integrals and limits. Spaced repetition for AP Calculus, IB and university, with starter decks.
Math Flashcard App
Math flashcards that show real formulas: fractions, roots, integrals and matrices. Spaced repetition plus ready-made decks from pre-algebra to calculus.
Chemistry Flashcard App
Chemistry flashcards with real formulas and reaction equations. Memorize reactions, element properties and organic mechanisms with spaced repetition.
Create your first deck in minutes. Free to start, nothing to install, no credit card required.
Start studying physics