kernRead better.
Keep more.
Guides on why books fall out of your head and what helps you keep them. They're free to read with no sign-up, and each one covers the research and the practical side.
Start here
How to Remember What You Read
The full system: why highlighting fails, what active recall does, and how to keep a book's ideas for years in five minutes a day.
Read the guide → The scienceWhy You Forget What You Read
The forgetting curve, explained: what happens to a book in your brain over 30 days, and what slows it down.
Read the guide → The methodSpaced Repetition for Books
How the technique behind Anki and language apps works for non-fiction books.
Read the guide →In practice
Turn Any Book Into Flashcards
Making book flashcards by hand takes hours per book. This guide shows how to get a usable deck from just the title.
Read the guide → AudiobooksHow to Remember Audiobooks
You can't highlight audio. Why audiobook retention feels worse, and how to keep what you heard without pausing to take notes.
Read the guide → The comparisonDo Book Summary Apps Work?
Summary apps cover books you haven't read. Retention tools help you keep the ones you have. A guide to which one you need.
Read the guide →Comparisons
Best Apps to Remember What You Read
Readwise, Anki, Blinkist, Headway, Loxie and Kern solve three different problems. Work out which one you have before you pick.
Read the guide → vs AnkiAnki Alternatives for Books
Anki is powerful, but it's a lot of work for most readers. Six options compared, including some that do things better than Kern.
Read the guide → vs BlinkistBlinkist Alternatives
Too expensive, too shallow, or you forget it anyway? Seven options compared, sorted by why you are leaving Blinkist.
Read the guide → vs ReadwiseReadwise Alternatives
Readwise needs highlights. Some alternatives need only a title. Six options compared, depending on whether you want to save highlights or remember books.
Read the guide →Tools
Stop forgetting
what you read.
Add a book you've already finished by typing its title. Get its ideas as cards, and review them for five minutes a day.
First book free. No account, no sign-up, works offline.
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