Today, at a glance
Today shows the cards that are due, a few new ones, your streak and your daily goal. Flip a card, rate it, move on. Switch to quiz mode when you want to.
PhysicsRecall
Know the laws, and why they work.
1,198 carefully written physics cards in 21 decks, with spaced repetition that schedules every review for you.
iPhone · iPad · Mac · Apple Watch
Mechanics
Try a real PhysicsRecall card: tap it, then rate it.
The film
PhysicsRecall, in motion.
A short narrated tour of the app.
Spaced repetition
Cards you miss come back sooner. Cards you know wait longer.
Flip a card, rate it Again, Hard, Good or Easy, and PhysicsRecall keeps the schedule for you.
Recall
Read the question and answer it in your head before you flip the card.
Rate
Tell the app how it went. Honest ratings make a better schedule.
Return
Open Today and the cards that are due are waiting, with a few new ones and your daily goal.
A closer look
Physics, screen by screen.
From the plan for today to the progress you have made. Every screen here is the real app.
Today's physics, plannedDue reviews, new cards, daily goal and streak 
Concepts and equationsFlip, recall, then rate Again, Hard, Good or Easy 
See how each session wentAccuracy, time, new cards learned and your streak 
Mechanics to modern physicsMastery for all 21 decks, with streaks and a heatmap
The library
21 decks. 1,198 cards. All included.
Carefully written for AP Physics 1, 2 and C, introductory college physics and MCAT physics review. Every deck is on your device from the first launch, and you can add your own.
Mechanics
73 cards
Motion, forces, energy, momentum, rotational motion, and Newton's laws
Electromagnetism
64 cards
Electric fields, circuits, magnetic fields, induction, and Maxwell's equations
Thermodynamics
64 cards
Heat, temperature, laws of thermodynamics, engines, and entropy
Waves & Optics
65 cards
Wave properties, sound, light, interference, diffraction, and polarization
Electric Circuits
57 cards
Ohm's law, resistors, capacitors, Kirchhoff's laws, and RC circuits
Quantum Mechanics
60 cards
Wave-particle duality, the Schrödinger equation, uncertainty, and quantum states
Relativity
59 cards
Special and general relativity, time dilation, length contraction, and spacetime
Nuclear Physics
63 cards
Radioactivity, decay, fission, fusion, binding energy, and nuclear reactions
Modern Physics
60 cards
Quantum mechanics, special relativity, atomic physics, nuclear physics, and particle physics
Work, Energy & Power
49 cards
Work-energy theorem, kinetic and potential energy, conservation, and power
Momentum & Impulse
50 cards
Linear momentum, impulse, conservation, and elastic and inelastic collisions
Rotational Mechanics
58 cards
Torque, angular momentum, moment of inertia, and rotational dynamics
Show all 21 decksShow fewer decks
Oscillations
53 cards
Simple harmonic motion, pendulums, resonance, and damped oscillations
Acoustics
49 cards
Sound waves, intensity, the Doppler effect, beats, and standing waves
Advanced Optics
57 cards
Geometric and physical optics, lenses, mirrors, interference, and diffraction
Magnetism
55 cards
Magnetic fields, forces on charges, electromagnetic induction, and Faraday's law
Fluid Mechanics
56 cards
Pressure, buoyancy, Bernoulli's principle, viscosity, and fluid flow
Particle Physics
51 cards
The Standard Model, quarks, leptons, bosons, and fundamental interactions
Astrophysics
56 cards
Stars, stellar evolution, black holes, galaxies, and the life cycle of stars
Cosmology
50 cards
The Big Bang, cosmic expansion, dark matter, dark energy, and the universe
Solid State Physics
49 cards
Crystal structures, band theory, semiconductors, and electrical properties
Features
Built for a few focused minutes a day.
See your progress
A summary after every session, mastery for each deck, streaks and a study heatmap in the Progress tab.
Add your own cards
Create and edit decks, or import cards from a CSV file and export them again. Optional AI card generation with your own OpenAI or Anthropic API key: you review every card before it is added.
front,back
"What is the SI unit of force?","The newton (N)"A nudge, not a nag
One daily study reminder at a time you choose, and a System, Light or Dark appearance to match your device.
Study anywhere, even offline.
All 1,198 cards are stored on your device. You only need a connection to buy or restore a purchase and for optional AI card generation with your own API key.
Constants, one tap away.
A built-in physical constants reference in the Constants tab, next to your decks.
- Speed of Lightc = 2.998 × 10⁸ m/s
- Planck Constanth = 6.626 × 10⁻³⁴ J·s
- Elementary Chargee = 1.602 × 10⁻¹⁹ C
- Gas ConstantR = 8.314 J/(mol·K)
Apple Watch
A few cards, right on your wrist.
Review due cards on Apple Watch; results sync back to your iPhone. Open PhysicsRecall on your iPhone to send due cards to the watch, then flip and rate them anywhere. The watch works offline once it has synced.
iPad and Mac
Room to think on a bigger screen.
A sidebar layout on iPad and Mac. On Mac, press Space to flip a card and 1 to 4 to rate it. One subscription unlocks iPhone, iPad and Mac. Progress is stored on each device.
Your study data stays on your device.
- No account or sign-up
- No ads, analytics or tracking
- Purchases handled by Apple
- AI only with your own keyOptional AI card generation with your own OpenAI or Anthropic API key. Requests go straight from your device to the provider.
Pricing
Simple pricing.
One purchase unlocks iPhone, iPad and Mac.
Monthly
$9.99 / month
7 days free, then $9.99 every month until you cancel.
Best value: save 49%
Yearly
$59.99 / year
7 days free, then $59.99 every year. That is about $5.00 a month, 49% less than paying monthly.
Lifetime
$99.99 once
Pay once. No subscription and nothing to renew.
How the free trial works
Monthly and yearly plans start with 7 days free for new subscribers. Cancel at least 24 hours before the trial ends and you will not be charged. Otherwise the plan renews automatically at the price shown until you cancel.
Included in every plan
- All 21 decks and 1,198 cards
- iPhone, iPad and Mac with one purchase
- Apple Watch app for quick reviews
- Study sessions, quizzes and progress
- Your own decks, with CSV import and export
- Optional AI card generation with your own OpenAI or Anthropic API key
Prices are in US dollars; the App Store shows the price in your currency. Payment is charged to your Apple Account. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and you can manage or cancel them in your Apple Account settings. Restore Purchases is available in the app. One purchase unlocks the app on iPhone, iPad and Mac signed in with the same Apple Account; study progress is stored separately on each device.
Questions, answered.
Something else? Email shankarduttsgd@gmail.com.
Is there a free trial?
Yes. Monthly and yearly plans start with a 7-day free trial for new subscribers. Cancel at least 24 hours before it ends and you will not be charged. Lifetime is a one-time purchase without a trial.
Is there a free version?
No. PhysicsRecall is a paid app, and you choose a plan when you first open it. The free trial on monthly and yearly lets you use everything before you pay.
Who is it for?
PhysicsRecall is built for AP Physics 1, 2 and C, introductory college physics and MCAT physics review. It covers Mechanics, Electromagnetism, Thermodynamics, Waves & Optics, Electric Circuits, Quantum Mechanics, Relativity and Nuclear Physics, among 21 decks in total. AP® is a trademark registered by the College Board; MCAT® is a registered trademark of the Association of American Medical Colleges. These organizations are not affiliated with, and do not endorse, PhysicsRecall.
Does my progress sync between iPhone, iPad and Mac?
No. One purchase unlocks PhysicsRecall on iPhone, iPad and Mac with the same Apple Account, but study progress is stored separately on each device. The Apple Watch app is the exception: reviews you do on the watch are sent back to your iPhone.
What does the Apple Watch app do?
It lets you review the cards that are due on your iPhone. Open PhysicsRecall on your iPhone to send due cards to the watch. You can then flip and rate them on your wrist, even offline, and your ratings sync back to your iPhone.
Can I add my own cards?
Yes. Create your own decks and cards, or import them from a CSV file with front and back columns. You can export decks as CSV as well.
Do I need an AI key?
No. AI card generation is optional. If you want it, add your own OpenAI or Anthropic API key in Settings. When you tap Generate, the app drafts cards for that deck and you review them before they are added. The provider bills any API usage to your own account.
Does it work offline?
Yes. All 1,198 cards are stored on your device. You only need a connection to buy or restore a purchase and to use optional AI card generation with your own OpenAI or Anthropic API key.
How do I cancel?
On iPhone or iPad, open Settings, tap your name, then Subscriptions, and choose PhysicsRecall. On Mac, open the App Store, click your name, then Account Settings, and manage Subscriptions. Apple handles billing and cancellation.
Start with 1,198 physics cards.
PhysicsRecall for iPhone, iPad and Mac, with an Apple Watch app for reviews on the go.
iPhone · iPad · Mac · Apple Watch