I built it for my own three. Then it went into the App Store.
In the summer of 2026 my daughters were 13, 15 and 17. I built this for them, and talked them into an hour a day at the kitchen table.
Read a chapter, answer the questions, then the part I liked best: argue about it. The 17-year-old disagreed with half of it. The 13-year-old asked things I couldn't answer.
They loved it. So I made it official and published it exactly as it was: no subscription, no adverts, no data collected about a child.