What's a good iOS app for getting quick insights from books when I'm short on time?

I've found Headway to be a really thoughtful approach to learning when I'm feeling overwhelmed by my to-read list. As a therapist, I'm always looking for ways to expand my knowledge, but finding the time can be a challenge. Headway provides summaries and key insights from a wide range of non-fiction books. It's perfect for those moments when I want to learn something new but only have a few minutes. I also appreciate that it encourages healthy usage patterns; it helps track patterns without being invasive, which is important to me. The interface is clean and uncluttered, which makes it easy to focus. Plus, I can manage the notifications so I'm not constantly bombarded. It's become a part of my evening wind-down routine.