Challenge Study Engine: Turn PDFs into gamified exams with local AI & BYOK

Hey Product Hunt community! 👋 I built Challenge Study Engine out of a simple frustration: passive reading and generic flashcards don't prepare you for demanding exams. Most AI study tools also lock your own notes behind expensive monthly SaaS subscriptions and upload your private materials to external cloud servers. Challenge Study Engine is built as a distraction-free desktop workspace that turns your revision materials into interactive mastery tests and active recall runs—with complete data privacy. Here is what’s under the hood: • 🎮 Gamified Quiz Challenges: Turn dense study materials into timed, streak-based recall games to test speed and accuracy. • 📝 Exam Paper Generation: Upload syllabus materials or notes to generate formatted, printable exam papers and answer keys (ideal for self-testing or educators). • 🔒 100% Local AI & BYOK: Run models completely offline on your own hardware via Ollama (zero data leaves your PC), or plug in your own API keys without recurring middleman markups. • 📑 Native PDF Editor: Read, highlight, and annotate your source materials directly inside the workspace. • 🤖 AI Tutor Chat: Ask questions, challenge concepts, and break down complex problems alongside your notes. • ⏱️ Study Planner & Focus Timer: Organize your daily study blocks and track revision sprints without switching apps. I’d love to hear your feedback, feature requests, and thoughts on local AI workflows. I'll be hanging out in the comments all day to answer questions!