Trilinguo
AI-powered language learning chat application with culturally-aware virtual tutors. Built as a personal replacement for Duolingo to get immersive practice. Features real-time predictive text, text-to-speech synthesis, and multi-language support.
Core Features
Multi-Language Support
- • Traditional Chinese, Simplified Chinese, Japanese, Korean, French
- • AI personalities with cultural context
- • Character-by-character romanization (pinyin, romaji, Korean romanization)
- • Cultural context explanations and teaching points
- • Conversation starters and learning prompts
AI Integration
- • Real-time predictive text suggestions with intelligent language detection
- • Text-to-speech synthesis with language-appropriate voices
- • OpenAI GPT-4.1-mini for conversations
- • GPT-4o-mini for predictive text
- • Intelligent conversation vs translation mode detection
Technical Stack
Frontend
- • Next.js 15, React 19, Tailwind CSS 4
- • Responsive glass-morphism UI with liquid background effects
- • Mobile-responsive design with touch interactions
- • Real-time UI state management with React hooks
- • Keyboard shortcuts and accessibility features
Backend & Services
- • Next.js API routes with Edge Runtime
- • OpenAI TTS for text-to-speech synthesis
- • Local browser storage with Zod validation
- • Password-protected access system
- • Audio caching and streaming optimization
Technical Highlights
- • Edge runtime for fast API responses
- • Structured JSON responses with Zod validation
- • Audio caching and streaming optimization
- • Error handling with user-friendly fallbacks
- • Persistent chat history per language
- • Real-time UI state management with React hooks
AI Personalities
Culturally-aware virtual tutors including 22-year-old Taiwanese student, Parisian literature student, and other contextually appropriate personalities for each supported language.