Spaced Repetition Deck
Cards you keep getting wrong come back tomorrow; the easy ones wait months.
IntermediateWeb appEducation10–20hAI-buildable 4/5no setupworth shipping
A flashcard app built around a real scheduling algorithm rather than a shuffled queue. Grade each card after answering and the interval adjusts — SM-2 or a simplified variant. The scheduler is the whole project, and a due-cards queue that behaves correctly across days is harder than it looks.
UI
Logic
Useful
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Core features · 7
- Create decks and add cards with a front and back
- Review session shows only cards that are due today
- Grade each answer and let the grade drive the next interval
- Ease factor per card adjusts up or down with performance
- A forecast shows how many cards are due over the coming days
- Session ends cleanly when the due queue is empty
- All decks and scheduling state persist
The interesting part
- Implementing an interval algorithm that behaves sensibly on day one and day four hundred
- Day boundaries and timezone changes shifting what counts as due
- Preventing a huge backlog from making the app unusable after a break
Once it works
- Add cloze deletion cards
- Import from an Anki export
- Add a retention graph over time
Suggested stack
reacttypescripttailwinddate-fnslocalstorage