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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. ChemFlash 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.

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.

ChemFlash Pro unlocks the full learning experience:

All 9 Subject Decks: Access 600+ flashcards including Organic Chemistry I & II, Inorganic Chemistry, Physical Chemistry, Biochemistry, Analytical Chemistry, and Environmental Chemistry.
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 (General Chemistry and Chemical Reactions) with 160+ cards.

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

1. Open ChemFlash 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.

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 ChemFlash and tap it
5. Tap "Cancel Subscription"

You'll continue to have access until the end of your current billing period.