Potreflect gives you interactive summaries for 50+ nonfiction books across business, psychology, self-improvement, and more. Read the key ideas, then lock them in by playing short games: fill the gaps, spot the weakness, recall from memory, swipe match. When deciding to go deeper, Challenge mode uses spaced repetition to resurface ideas at the right intervals so they stick long-term. You can also create your own summaries from any content you like and share them with other users in the app.