Effective Geo 🌍

Master World Capitals with Spaced Repetition

💡 About

Effective Geo is a geography learning application designed to maximize memory retention. Unlike simple quiz apps, it implements the SuperMemo-2 (SM-2) algorithm to schedule reviews based on the user's performance.

If you struggle to recall a capital, the app brings it back quickly. If you know it well, it schedules the next review weeks into the future. It features a comprehensive offline database of countries, flags, and population data.

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📱 Screenshots

Home & Progress	Flashcard Learning	Country Details

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🚀 Key Features

• 🧠 Spaced Repetition: Uses the SM-2 algorithm to calculate the optimal interval for memory consolidation.
• 📊 Progress Tracking: Visual charts using fl_chart to monitor mastery levels over time.
• 💾 Offline First: Complete country database stored locally using SQLite.
• 🌗 Dark Mode: Fully supported UI theming.
• Quality Feedback: 4-level rating system (Again, Hard, Good, Easy) directly influencing the scheduling algorithm.

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🛠 Tech Stack

• Framework: Flutter & Dart
• State Management: rxdart (Reactive Streams)
• Local Database: sqflite (Raw SQLite interaction)
• Dependency Injection: get_it
• Architecture: Service-based architecture separating UI, Logic, and Data.

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🧠 The Algorithm (SM-2)

The core logic revolves around the SuperMemo-2 algorithm. Every card has dynamic properties stored in the SQLite database:

• Interval (I): Days until next review.
• Repetition Factor (EF): Easiness factor, adjusted based on user rating (0-3).
• Repetitions (n): Correct streaks.

// Simplified Logic
NextInterval = PreviousInterval * EasinessFactor
NewEasinessFactor = OldEF + (0.1 - (5 - Quality) * (0.08 + (5 - Quality) * 0.02))

This ensures that "hard" cards are shown frequently, while "easy" cards are pushed to long-term memory.

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📥 Installation

1. Clone the repo

git clone https://github.com/libaum/effective_geo.git

2. Install dependencies

flutter pub get

3. Run

flutter run

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