For people who read to remember
Stop forgetting what you read.
ChapterFlow turns every book into a short guided loop — read it, recall it, and let spaced review bring the ideas back until they're yours for good.
No card needed · 2 free books · free forever
The loop
Four steps. Then it sticks.
Every chapter takes about 12 minutes. You read it, you recall it, and the ideas come back on their own, with no notebooks and no willpower.
- 01
Summary
The big ideas of the whole book, distilled to what matters.
- 02
Examples
Watch each idea play out in real situations, so it actually clicks for you.
- 03
Quiz
You recall it in your own words. That small act of effort is what burns it in.
- 04
Spaced review
It finds you again days later, right before you'd forget, until it is yours for good.
Why it works
Built on a century of memory research.
We didn't invent how your memory works. We just built the loop around a century of research, so you don't have to think about it.
Memory decays on a predictable curve. Most of what you read is gone within days, unless something interrupts the forgetting.
Recalling an idea from memory locks it in far better than rereading it. The act of retrieval is what makes knowledge last: the testing effect.
The same study, spread out over time, beats the same study crammed together. Spacing reviews is one of the most reliable findings in learning.
A modern scheduling algorithm predicts the moment you're about to forget and brings each idea back right then, so you never review more than you need.
The library
135 books, all real.
The non-fiction that has been sitting half-read on your shelf, each one rebuilt into the loop. Pick a cover and finally make it stick.
Requests
Don’t see your book?
Tell us the title and we’ll email you if it joins the library. Every request lands with us directly, and shapes what we build next.
Before you start
Questions, answered.
Yes — cancel anytime from your settings, no penalties, no lock-in. Cancel during the 14-day trial and you're never charged. Cancel after and Pro runs until the end of the period you've paid for.
Nothing disappears — you keep your finished books and their summaries, examples, and reviews. To start new books, you upgrade to Pro.
Always. We add titles regularly, and you can request the ones you want — Pro requests get priority.
ChapterFlow runs in any browser, on any device — nothing to install. A native app is on the roadmap.
It's yours. Export everything — progress, notes, the lot — as JSON, CSV, or Markdown anytime, and delete your account whenever you want. Deleting also cancels any active subscription.
Pricing
Start free. Upgrade when it sticks.
Two plans, no lock-in. Read 2 free books, no card. Upgrade when you feel it working. Cancel anytime.
Save 25% billed annually
Free
Try the full loop on two complete books. No card, no expiry.
- The full book library to browse
- Finish 2 complete books
- Summaries, examples, and quizzes
- Lite and Standard depth modes
- Spaced-repetition review
Pro
Recommended
The whole library and the deepest reading mode, with priority on new titles.
- Everything in Free, unlimited
- Every book, no finish limit
- Deeper depth mode
- Text-to-speech audio
- Reading analytics and note export
- Priority on new title requests
Cancel anytime.
Card required, charged when the 14-day trial ends.
Read it once. Keep it for good.
Start with 2 free books, no card. From here on, what you read stays with you.