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Things worth knowing
A price differs from the book's site
The app shows the book's price a moment ago; the book takes the one on its own site. Prices near the jump move quickly.
Managing a subscription
Subscriptions are managed in your App Store account: Settings → your name → Subscriptions on an iPhone; App Store → your name → Account Settings on a Mac.
Logging out
Logging out of a book in the app removes its login from the device's keychain. Nothing was ever sent to us.
The free plan's two books
Chosen once, and that is it: the free plan does not swap books. Plus shows every book.
Restoring a purchase
Settings → Plans → Restore purchases. It reads the App Store; nothing else is needed.
What's new
Release notes appear here from the first TestFlight build.