StudyLumina - The exam readiness score. Not a feeling — a number

Hi Product Hunt 👋 Quick, honest question before I explain anything: how do you actually know you're ready for an exam? Most people answer with a feeling. "I've reviewed everything twice." "I feel good about this chapter." That feeling is usually wrong — and it's expensive to be wrong on exam day. I got tired of trusting that feeling, so I built StudyLumina to replace it with a number. Here's the mechanism, no marketing spin: 📊 Exam Readiness Score (ERS) — 0 to 100, computed, not felt Every quiz you take, every flashcard you review, every session you run — it all feeds a deterministic TypeScript formula, never an AI guess: — Accuracy — what you actually got right, not what you remember getting right — Recency — the score decays on a real forgetting curve after 48 hours, so "ready last week" isn't "ready today" — Coverage — 3 lucky answers on a 40-page chapter won't fool it into saying "ready" — Speed — how fast you recall it, because hesitation under time pressure is real signal — Flashcard retention — your live SM-2 spaced-repetition state, factored in Feed it the same inputs twice, get the same score twice. That's the whole design principle. 🎯 What it does with that score It doesn't just show you a dashboard and leave you to figure out the rest. It picks: "Chapter 4 is your weakest, 45 minutes, quiz format — do this first today." One task, re-ranked daily as your scores change. ⏱️ And when you're close to the exam Focus Sessions (timed, zero distraction) and full Exam Simulation (Premium — mixed MCQ + written questions, AI-graded with actual feedback on what you missed) so the first time you sit a real exam under pressure isn't exam day. 🤖 One more thing — the AI Tutor doesn't hallucinate It only answers from documents you actually uploaded, with citations back to the page. If it's not in your material, it tells you that instead of making something up. --- The AI in this product generates, explains, and grades written answers. It never decides the score. That line is non-negotiable and it's the whole reason this exists. Free plan, no credit card. I'd rather you break it with hard feedback than tell me it's great — what would make you actually trust a number like this?