Turn your Duo into a book.
Download free on the App Store


Closed, a book cover.
Close it. Open another page.
On Duo, physically close and reopen the device to find another reflection. On an ordinary iPhone, use the on-screen Open book and Close book buttons.
1,000 English reflections
Offline, no account needed
Save favorite pages and revisit your history
The interface and reflections are in English. Requires iOS 26 or later. Reflections are prompts for personal thought, not predictions.