Recall AI – Flutter Flashcard App with AI Generation, Spaced Repetition & In-App Subscriptions

Recall AI is a complete, production-ready Flutter application that helps users learn anything faster using AI-generated flashcards and the proven SM-2 spaced repetition algorithm. Built with clean architecture, Riverpod state management, Firebase backend, OpenAI card generation, and RevenueCat subscriptions — everything you need to launch your own study app on Android and iOS.

✨ Key Features

• AI Flashcard Generation — Paste notes, type a topic, or upload a PDF/image. OpenAI (GPT-4o-mini) generates a full deck of flashcards in seconds.
• SM-2 Spaced Repetition — The same algorithm used by Anki. Cards are scheduled at the optimal interval for long-term retention (New → Learning → Review → Mastered).
• 4 Study Modes — Flashcard flip, Multiple Choice (MCQ) with explanations, True/False, and Typing mode (Pro).
• OCR Input (Pro) — Snap a photo or upload a PDF. Google ML Kit extracts the text, then AI turns it into a study deck.
• AI Study Guide — Per-deck AI-generated overview with key concepts, common mistakes, and memory tips.
• Gamification — XP, levels, daily streak tracking with 2× XP multiplier, badges, and mastery percentage per deck.
• Analytics Dashboard — Weekly study chart, subject mastery breakdown, level progress bar, and badge showcase.
• Deck Sharing & Explore — Share decks with a 6-character code. Browse and import from a public community feed.
• Push Reminders — Firebase Cloud Messaging sends daily study reminders to keep users on streak.
• In-App Subscriptions — Free, Monthly, Yearly, and Lifetime tiers managed via RevenueCat with a built-in paywall screen.
• Dark & Light Theme — Material 3 design with dynamic color scheme. Fully customizable brand color.
• 4 Auth Providers — Email/password, Google Sign-In, Sign in with Apple, and anonymous guest mode.
• Offline / Guest Mode — Guests study locally via SharedPreferences. Authenticated users sync via Firestore.
• Portrait-only, phone-first UI — Pixel-perfect Material 3 design with Figtree font.