Adaquiz
Level up your coding skills with adaptive quizzes for JavaScript, Python, Go, Rust, Java, and C++. Track your progress, identify weaknesses, and become a better programmer. Free to start!
Categories:
AdaQuiz
Master Programming Languages with Interactive Quizzes
🎯 Overview
AdaQuiz is a modern, production-ready Progressive Web App (PWA) for mastering programming languages through interactive quizzes. Built with Next.js 16 and React 19, it features adaptive learning using spaced repetition (SM-2 algorithm), AI-generated questions, and comprehensive analytics.
Live at: adaquiz.online
Key Highlights
- 🧠 Adaptive Learning - SM-2 spaced repetition algorithm optimizes review timing
- 🤖 AI-Generated Questions - Fresh content powered by OpenAI GPT-4
- 📊 Performance Analytics - Track progress, identify weaknesses, visualize trends
- 📱 PWA Support - Works offline, installable as native app
- 🔒 Enterprise Security - CSP headers, RLS policies, rate limiting
- ✅ 405 Tests - Comprehensive test coverage with Vitest
✨ Features
Core Functionality
- 6 Programming Languages: JavaScript, Python, Go, Rust, Java, C++
- 3 Difficulty Levels: Easy, Medium, Hard
- Quiz Management:
- Auto-save progress (resume incomplete quizzes)
- Keyboard shortcuts (1-5 for answers, Enter to submit, arrows to navigate)
- Timer with remaining time display
- Mark questions for review
Learning Features
- Spaced Repetition: SM-2 algorithm tracks individual question performance
- Smart Question Selection: Prioritizes due reviews → fresh questions → retry questions
- Detailed Explanations: Every question includes explanations for correct answers
- Question Reporting: Users can flag incorrect or unclear questions
User Tiers
| Tier | Daily Quizzes | Questions/Quiz | Difficulty | Features |
|---|---|---|---|---|
| Free | 1 | 25 | Easy, Medium | Basic stats |
| Plus ($5.99/mo) | 5 | 25 | Easy, Medium, Hard | Basic stats |
| Pro ($9.99/mo) | 15 | 40 | All | Advanced insights, charts, data export |
Pro Features
- Performance Charts: Recharts visualizations of progress over time
- Weakness Detection: Identifies struggling topics
- Trend Analysis: Compares recent vs. historical performance
- Data Export: JSON/CSV export of quiz history
Technical Features
- PWA: Offline support, installable, background sync
- Security: CSP headers, Row-Level Security (RLS), rate limiting
- Analytics: Vercel Analytics & Speed Insights
- Accessibility: WCAG compliant, keyboard navigation, screen reader support
- Responsive: Mobile-first design with tablet/desktop optimization
🛠 Tech Stack
Frontend
- Framework: Next.js 16.1.4 (App Router, React Server Components)
- UI: React 19.2.3, TypeScript 5
- Styling: Tailwind CSS 4, shadcn/ui components
- State: React hooks, server actions
- Charts: Recharts (Pro analytics)
Backend
- Database: PostgreSQL via Supabase
- Auth: Supabase Auth (email, OAuth)
- Payments: DodoPayments (subscriptions)
- AI: OpenAI GPT-4 (question generation)
- Rate Limiting: Upstash Redis
DevOps
- Hosting: Vercel
- CI/CD: GitHub Actions
- Testing: Vitest, React Testing Library
- Monitoring: Vercel Analytics, Speed Insights
🙏 Acknowledgments
- shadcn/ui for beautiful components
- Supabase for auth and database
- DodoPayments for subscription handling
- OpenAI for AI-generated questions
- Vercel for hosting and analytics
Built with ❤️ by the AdaQuiz Team
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