Free
In-App Purchases
About
This app helps you retain knowledge from books you've read by creating interactive flashcards. It uses spaced repetition to resurface information as it begins to fade, supporting both fiction and non-fiction content. Review your library offline and see an honest picture of what you remember.
✓Spaced repetition flashcards
✓Supports fiction and non-fiction
✓Offline review capability
✓Interactive cards
✓No account required
✓Book fading visualization
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What's New in Kern
1.5
October 13, 2026
Kern 1.5 brings your books to you. Reminders now carry an idea from the book you're losing. Press and hold one to see the whole card and tap Got it, without opening Kern. They come once a day at a time you pick, only on days you haven't opened the app, and ease off if you're away. New Home Screen and Lock Screen widgets. Answer a card or a quick quiz on your Home Screen, and see which book is fading at a glance. Share an idea as a poster, or challenge a friend with a spot-the-lie quiz from a book you've read. New phone? Your library, progress and saved cards come back on their own through iCloud. The Wall has a list view, sorted A to Z and split into fiction and non-fiction. A faster start: search shows which books are ready instantly, and setup asks three quick questions to fit Kern to your day.
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Subscriptions & In-App Purchases
Kern Plus (Annual)
Every book you've read, billed yearly.
$39.991 Year
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FAQ
How does Kern help me remember books?
Kern creates interactive flashcards from the books you add, using spaced repetition to resurface information as you begin to forget it. This method is designed to strengthen your memory of key ideas, characters, and plot points.
Can I use Kern for both fiction and non-fiction books?
Yes, Kern generates different types of cards tailored for fiction and non-fiction. Fiction cards focus on characters and plot, while non-fiction cards highlight key ideas and arguments.
Is Kern free to use?
Kern offers your first two books for free without any payment required. You can then choose to unlock individual books with a one-time purchase or subscribe to Kern Plus for unlimited book access.
What are the subscription options for Kern Plus?
Kern Plus offers both monthly and annual subscription plans. The monthly plan is $5.99 per month, and the annual plan is $49.99 per year, providing unlimited access to all features.
Can I review my flashcards offline with Kern?
Yes, once a deck is created for a book, you can review your flashcards anywhere, fully offline. This allows for flexible learning and review sessions without needing an internet connection.
Does Kern have ads?
No, Kern does not contain advertisements. The app is designed to provide an uninterrupted learning experience, focusing on your retention of book content.
How do I cancel my Kern Plus subscription?
You can manage or cancel your Kern Plus subscription at any time through your App Store account settings. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current billing period.
What age rating does Kern have?
Kern has an age rating of 4+. This indicates that the content and design are suitable for users aged four and above.
