Who hurts
Professional exam candidates: nursing boards, CPA, actuarial, medical residency.
The problem
Spaced repetition works and almost nobody uses it, because writing 800 good cards is a bigger job than reading the book twice.
What you build
Upload the material, get cards generated at the level the exam actually tests, application, not definitions, scheduled properly, with each card linked back to the source page so a wrong answer is one tap from the explanation.
Why now
Card quality was the blocker for a decade of attempts. Generating cards that test application rather than trivia is now reliable enough to trust.
Validate it this week
Generate a deck for one exam's most-used textbook and give it away in that exam's subreddit. Card quality complaints will be specific and immediate.
Why you'd keep winning
Exam-specific question style. A CPA candidate can tell within five cards whether you understand their exam, and generic tools never do.
The honest risk
Anki is free, beloved and has a shared-deck ecosystem. You are selling the hours of card-writing, not the algorithm, price accordingly.
The prompt is written to make an AI argue with you before it writes code. That first round of pushback is worth more than the scaffold.