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Spaced repetition is a learning technique that schedules reviews at increasing intervals. When you answer a card correctly, you'll see it less frequently. When you struggle with a card, you'll see it more often. PhysicsFlash uses the SM-2 algorithm, the same system used by millions of students worldwide. This approach is scientifically proven to move information into long-term memory more efficiently than traditional studying.

Again: You forgot the answer or got it wrong. The card will be shown again soon.
Hard: You remembered but it was difficult. The interval will increase slightly.
Good: You remembered correctly with normal effort. Standard interval increase.
Easy: You recalled instantly with no hesitation. Larger interval increase.

Be honest with your ratings! Accurate self-assessment is key to effective learning.

We recommend starting with 10-20 new cards per day. This keeps your review load manageable as cards accumulate. You can adjust this in Settings. Remember: consistency beats intensity. It's better to study 15 minutes daily than to cram for hours once a week. The default settings are optimized for most students, but feel free to experiment to find what works for you.

Yes! Tap the + button in any deck to add your own cards, or create entirely new decks. You can add questions, answers, explanations, hints, and tags. Creating your own cards is a great way to reinforce learning - the act of formulating questions helps encode information in your memory.

Standard: Reviews due cards using spaced repetition. Best for daily studying.
Learn New: Focus only on new cards you haven't studied yet.
Cram: Study all cards without affecting your SRS schedule. Great before exams.
Quiz: Multiple choice self-test to assess your knowledge.

For optimal learning, use Standard mode daily and Cram mode only when needed for quick reviews.

Your data is stored locally on your device and included in your device's iCloud backup. With PhysicsFlash Pro, you also get native iCloud sync that keeps your progress synchronized across all your Apple devices automatically.

PhysicsFlash Pro unlocks the full learning experience:

All 7 Physics Decks: Access 500+ flashcards including Kinematics, Dynamics, Energy & Work, Momentum, Waves, Circuits, and Thermodynamics.
Apple Watch App: Study on the go with our companion Watch app featuring quick quizzes and study sessions.
Quiz Mode: Test yourself with multiple-choice quizzes.
Cram Mode: Review all cards before exams without affecting your schedule.
iCloud Sync: Keep your progress synced across all your devices.
Advanced Statistics: Detailed insights into your study patterns.

Free users get access to 2 decks (Kinematics and Dynamics) with 145+ cards.

The PhysicsFlash Apple Watch companion app (included with Pro) lets you study anywhere:

Study Mode: Review your due cards right from your wrist with the full spaced repetition experience.
Quick Quiz: Test yourself with a fast 5-question quiz when you have a few minutes.
Complications: Add due card count and study streak to your watch face.
Sync: Progress automatically syncs with your iPhone app.

Perfect for studying during commutes, between classes, or anytime you have a spare moment!

If you've previously purchased PhysicsFlash Pro and need to restore it:

1. Open PhysicsFlash and go to Settings
2. Tap "Restore Purchases" in the Subscription section
3. Sign in with the same Apple ID you used for the original purchase

Your subscription will be restored automatically. If you continue to have issues, please contact us at support@physicsflash.app with your Apple ID (email) and approximate purchase date.

You can cancel your subscription anytime through your Apple ID settings:

1. Open the Settings app on your iPhone
2. Tap your name at the top
3. Tap "Subscriptions"
4. Find PhysicsFlash and tap it
5. Tap "Cancel Subscription"

You'll continue to have access until the end of your current billing period. You can also manage your subscription from within the app by going to Settings → "Manage Subscription".

To reset progress for a specific deck, open the deck, tap the menu button (...), and select "Reset Progress." This will mark all cards as new and reset your study statistics. Note: this action cannot be undone. If you just want to review cards again without resetting, use Cram mode instead.

This is the spaced repetition algorithm working as intended! Cards you find difficult appear more frequently to help you learn them. Cards you know well appear less often, saving you time. Over time, you'll notice difficult cards become easier as they move into your long-term memory. Trust the process!

We take content accuracy seriously! If you find an error, please email us at content@physicsflash.app with:
• The deck name
• The question text
• What you believe is incorrect
• A source or reference if possible

We review all reports and update content in app updates. Thank you for helping us improve!