I built a tool that tells me if readers actually understood my articles

After publishing 66 technical articles on DevOps and AI infrastructure, I realised I had a blind spot. I knew how many people visited my articles. I had no idea how many people understood them. Page views, bounce rates, time on page — none of these tell you whether your explanation of Kubernetes state management actually made sense to the reader. So I built QuizOps. What it does You paste your article URL. GPT-4o reads it and generates 10 multiple-choice questions streamed in real time. You review, edit, and publish. Your readers get a quiz link. You see who passed, who failed, and which specific questions tripped people up. The technical bits The generation uses OpenAI's streaming API with NDJSON output — each question is a complete JSON object on its own line. The frontend reads the ReadableStream line by line and renders questions as they arrive with a fade-in animation. It genuinely looks like the AI is thinking in real time. // Each line from the stream is a question const lines = buffer.split('\n'); for (const line of lines) { if (!line.trim()) continue; try { const q = JSON.parse(line); setQuestions(prev => [...prev, q]); } catch {} } Stack: Next.js 14 (App Router) Supabase (auth + DB with RLS) OpenAI API (gpt-4o-mini, streaming) Vercel (hosting + serverless) Resend (email notifications) Playwright (E2E test suite) Sentry (error monitoring) Content moderation Before generating questions, the API runs two classification checks: Domain intent check — is this URL likely to contain inappropriate content? Content check — is the fetched article appropriate for educational quiz generation? Both use a lightweight GPT-4o-mini call before the main generation request. Community quiz banks Beyond publisher quizzes, there are community quiz banks (JSON files in the repo) covering: Prompt Engineering, LLM APIs, AI Agents, RAG & Vectors, Kubernetes, Terraform, GitHub Actions, Python for AI Engineers, Cloud Native, and AI Security. Anyone can add a new bank by dropping a JSON file — no code changes needed. Try it quiz.autoshiftops.com — free, no credit card. Would love feedback from other technical writers on what's missing.