Drill

A mobile language learning app with AI-powered tutoring and spaced repetition.

What is Drill?

Drill helps you learn languages through writing practice and vocabulary review.
Write responses to AI-generated prompts tailored to your level, get instant
corrections and feedback, and build your vocabulary with a flashcard system that
tracks what you know.

Features

AI Writing Tutor

• Writing prompts adapted to your CEFR level (A1-C2)
• Instant corrections with detailed feedback
• Contextual explanations for grammar and vocabulary

Spaced Repetition

• Translation-pair flashcards with SM-2 inspired scheduling
• Deck management with daily limits
• Review history tracking

See Spaced Repetition for the full
architecture and data model.

Vocabulary Management

• Save phrases with translations
• Organize with tags and decks
• Track difficulty and part of speech

Tech Stack

• React Native + Expo SDK 54
• Expo Router with native tabs
• WatermelonDB for local-first data
• Google Gemini Flash for AI features
• TypeScript

Getting Started

# Install dependencies
yarn install

# Start development
yarn start:expo

# Run on iOS/Android
yarn ios
yarn android

Credits

Built with collaboration from Claude, ChatGPT, and Cursor.