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

Recall AI — AI-Powered Flashcard & Spaced Repetition App

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.

⬇ Download Demo APK

✨ Key Features

• AI Flashcard Generation — Paste notes, type a topic, or upload an image of your notes. 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) — Upload a photo or image of your notes. 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.
• Study Reminders — scheduled local notifications tell users how many cards are due, with optional streak-protection alerts. No backend required; works offline.
• 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.

Screens Included

• Splash Screen with brand animation
• Onboarding carousel (3 slides)
• Sign In / Sign Up (Email, Google, Apple, Guest)
• Home Overview — stats card, recent decks, quick start
• Deck List — search, sort, filter by subject & mastery
• Deck Method Selection — 4 creation modes
• Deck Creation — AI generation form with subject, difficulty, card count
• Deck Detail — 3 tabs: Flashcards, Stats, AI Study Guide
• Deck Edit — add, edit, reorder, delete cards
• Study Session — 4 modes with progress header
• Study Summary — results, XP earned, mastered cards
• Progress / Analytics — level, streak, weekly chart, badges
• Profile — account info, subscription status, quick stats
• Settings — theme toggle, study goals, reminder time and streak alerts, sign out
• Explore — browse community-shared decks
• Import Deck — 6-character share code lookup
• Paywall — subscription plans with feature comparison

Tech Stack

• Framework: Flutter 3 / Dart 3
• State Management: flutter_riverpod
• Routing: go_router with route guards
• Backend: Firebase Auth, Cloud Firestore, Firebase Remote Config
• AI: OpenAI GPT-4o-mini (key stored in Remote Config — no hardcoding)
• Monetization: RevenueCat (purchases_flutter)
• OCR: Google ML Kit Text Recognition
• Design: Material 3 · Figtree font · Teal seed color (#0D9488)
• Architecture: Clean architecture per feature (presentation / application / domain / data)
• Testing: Unit tests + policy tests included

Subscription Tiers

Plans: Free · Monthly ($4.99) · Yearly ($29.99) · Lifetime ($49.99). Every paid plan unlocks the same Pro feature set — only the billing period differs.

• Max decks — Free: 5 · Pro: unlimited
• AI generations per day — Free: 3, plus one more for each optional rewarded video · Pro: unlimited
• Cards per generation — Free: 15 · Pro: 50
• Character input limit — Free: 2,000 · Pro: 20,000
• Image upload (OCR) — Free: ✗ · Pro: ✓
• Deck sharing — Free: 1 deck · Pro: unlimited
• Analytics history — Free: 7 days · Pro: all time
• Ads — Free: optional rewarded videos · Pro: none

⚙️ Requirements to Launch

• Flutter SDK 3.x
• Firebase project (free tier works fine)
• OpenAI API key (added to Firebase Remote Config — no code change needed)
• RevenueCat account (free up to $2,500 MRR)
• Google Play Console ($25 one-time) for Android
• Apple Developer account ($99/year) for iOS + Sign in with Apple

What’s Included

• Complete Flutter source code (Android + iOS)
• Full offline HTML documentation (docs/documentation.html)
• Quick Start Guide (docs/quick-start.html)
• Unit tests + policy tests
• Clean architecture, well-commented and ready to customise

Changelog

Version 1.1.0 — Reminders, Rewarded Ads & Toolchain Upgrade

Upgrade note: this release raises the minimum toolchain to Flutter 3.44 / Dart 3.12, JDK 17 and Android Gradle Plugin 9.

• New — Study Reminders. Opt-in daily notification at a time the user picks, showing how many cards are due, plus an optional alert when a streak is about to break. Local notifications, so no backend is required and they work offline and in guest mode.
• New — Rewarded video ads. Free users get 3 AI generations per day, then can watch an optional rewarded ad to earn one more. Pro subscribers are never gated and see no ads.
• New — Release signing via android/key.properties, with an example file included. Release builds were previously debug-signed, which Google Play rejects.
• New — Privacy policy draft (docs/privacy-policy.md) plus tappable Terms / Privacy links on the sign-up screen and in Settings.
• New — Play Store release guide (docs/play-store-release.md) with Data Safety form answers and a submission checklist.
• Upgraded Riverpod to 3.4.2, go_router to 17.5.0, RevenueCat to 10.8, Google Sign-In to 7.2, Sign in with Apple to 8.1, fl_chart to 1.2, google_fonts to 8.2, ML Kit to 0.16, and the Firebase suite to current.
• Upgraded the Android toolchain to Gradle 9.1.0, AGP 9.0.1, Kotlin 2.3.20 and google-services 4.4.4.
• Fixed a silent failure where a release build without a RevenueCat key shipped with an empty key and failed every purchase with no error shown.
• Fixed the iOS Google Sign-In URL scheme, which was missing and prevented the sign-in callback from returning.
• Documentation corrected — previous versions described banner ads and push reminders that were not present in the code. Those features now exist, and the docs describe what actually ships.

Version 1.0.1 — Bug Fixes

• Fixed the flashcard answer side sometimes being unreadable — the answer now uses guaranteed-contrast Material 3 colors in both light and dark themes, with a clear placeholder when a card has no answer.
• Fixed newly imported or created decks occasionally showing no flashcards — the deck’s cards now appear immediately (stale cached card list is refreshed after save/import).
• Renamed the “Upload PDF / Image” creation option to “Upload Image” to accurately reflect image-based OCR input.
• Added the iOS photo library usage description (NSPhotoLibraryUsageDescription) for App Store compliance when importing images for OCR.

Version 1.0.0 — Initial Release

• AI flashcard generation via OpenAI GPT-4o-mini (paste notes, topic, OCR)
• SM-2 spaced repetition engine with 4 card states
• 3 study modes: Flashcard, MCQ, True/False
• AI-generated per-deck Study Guide
• Gamification: XP, levels, streaks, badges
• Analytics dashboard with weekly chart and subject breakdown
• Deck sharing with 6-character codes and public Explore feed
• RevenueCat subscriptions: Monthly, Yearly, Lifetime
• 4 auth providers: Email, Google, Apple, Anonymous
• Dark / Light theme toggle
• Full offline guest mode
• iOS arm64 simulator support (MLKit 0.15.1 + platform 15.6)

Support

We provide dedicated support for all CodeCanyon buyers. Please include your purchase code when reaching out.

• Email: devsnack26@gmail.com
• WhatsApp: +855 967 413 911

Response time: within 24–48 hours on business days.