Hi Product Hunt! Ii've built MindStack for myself first. I was preparing for technical interviews and trying to memorize everyday topics—APIs, workflows, commands, even random facts. But I kept running into the same problem: my trainings were scattered, hard to edit, and a pain to keep organized. Existing flashcard apps felt rigid. I couldn't easily review AI-generated suggestions before saving, editing in place felt clunky, and managing growing datasets became messy. So I built a single place to keep all my trainings organized, with a convenient way to control and edit everything—plus AI that helps without taking over. What makes it different: - Full control over your content – AI drafts stay in review mode until YOU approve, edit, or regenerate them - Organized hierarchy – Categories → Topics → Questions → Answers. Scales from 10 to 1000+ items cleanly - Duplicate detection (beta) – catches similar questions as your dataset grows - In-place editing – modify Q&As directly inside the training interface using a rich text editor. No more context switching - Privacy by default – topics are private unless you choose to share - Spaced repetition – active recall workouts with progress tracking Who it's for: Students, professionals, devs memorizing APIs, language learners—or anyone who wants a clean, controllable system for their knowledge drills. Tech stack: Next.js 15, React 19, PostgreSQL, LangChain, Cloudflare Workers AI, Stripe + YooMoney. Links: - Live app: https://mind-stack-trainer.verce... - GitHub: https://github.com/lilliputten/m... - Project info: https://lilliputten.com/projects... Launch offer: Free tier includes core features + limited AI generation. Premium unlocks unlimited topics, higher quotas, and advanced analytics. I'd love your feedback, questions, or to hear how you organize your own knowledge drills. Ask me anything below!

MindStack

Turn Your Knowledge Into Repeatable Trainings

Turn Your Knowledge Into Repeatable Trainings