Kern: Remember What You Read
Spaced repetition for the books you've already read
Kern is an iPhone app for people who finish books and then forget them. Type the title of a book you've read (paper, Kindle, library copy or audiobook) and Kern turns it into a deck of cards written in its own words. Non-fiction decks cover the key ideas, examples and surprising claims. Fiction decks revisit the characters, turning points, themes and settings.
Spaced repetition then brings each idea back as it starts to slip, in about five minutes a day, with every book in one mixed feed. Books live on the Wall, staying inked while you review them and fading when you don't. Home Screen and Lock Screen widgets let you answer a card without opening the app, and an optional reminder carries an idea from the book you're losing.
There are no streaks, no leaderboards and no account. Reviews work offline. The first book is free, and Kern Plus unlocks unlimited books.
Features
- Add any book by title: no uploads, highlights or notes
- Fiction and non-fiction decks, written as paraphrase, never quotes
- Spaced repetition across your whole library in one feed
- The Wall: books stay inked when reviewed and fade when neglected
- Home Screen and Lock Screen widgets, plus optional idea reminders
- No account, no streaks, works offline
Use Cases
- Non-fiction readers who want to keep the ideas from business, psychology and history books
- Audiobook listeners and paper-book readers who have no highlights to export
- Bringing back a book you read years ago before you recommend it or quote it in a meeting
- Catching up on a fiction series before the next book comes out
- Five minutes of review on the commute, even offline
Comments
Hi, I'm Josip, an iOS developer from Croatia. I built Kern because I kept finishing books I loved and, six months later, couldn't explain them. Summary apps cover books you haven't read. I wanted the opposite: keep the ones I have. Kern only needs a title, so it works for paper books, audiobooks and things you read years ago. There are no streaks on purpose. The Wall just shows you which books are fading. Your first book is free and there's no sign-up. I'd love to know which book you'd add first, and anything that feels off.
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Comments
Hi, I'm Josip, an iOS developer from Croatia. I built Kern because I kept finishing books I loved and, six months later, couldn't explain them. Summary apps cover books you haven't read. I wanted the opposite: keep the ones I have. Kern only needs a title, so it works for paper books, audiobooks and things you read years ago. There are no streaks on purpose. The Wall just shows you which books are fading. Your first book is free and there's no sign-up. I'd love to know which book you'd add first, and anything that feels off.
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