Read deeper. Think sharper.
A reading environment built to train deep focus — the great books, an interface engineered for immersion, and an AI that challenges you to think rather than thinking for you.
The case for depth
Depth is becoming rare.
Information has never been easier to get. Reading it deeply has never been harder. The modern screen is optimized for speed, brevity, and interruption — and it is conditioning us to scan rather than study, to react rather than reflect.
We think the capacity for sustained focus is becoming the scarcest — and most valuable — human asset.
IO is built on that bet.
Built for immersion
One paragraph at a time. Or one sentence.
Card and reel modes strip the page to a single unit of thought. No progress anxiety, no wall of text — just you and the sentence in front of you, for as long as it deserves.
Reading sample
A magazine that opened itself.
It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife.
Set in the New York serif. This is what every book in IO looks like.
For the reader who rereads.
The personas
An AI that asks more of you.
It won’t summarize the book. The Critical Thinker argues with the passage. The Interpreter builds the bridge to what you already know. The Translator carries meaning across languages without flattening it. Every one of them is built to leave you sharper than the page found you.
The library
Five centuries of the canon, typeset for your pocket.
Project Gutenberg and Standard Ebooks, presented like a magazine — and a For You feed that learns how you read, not just what. Austen to Aurelius, included with IO from the first open.
Also in IO
The rest of the instrument.
- Cross-device sync — your place, highlights, and library on every device.
- EPUB & web-article import.
- Reader-profile personalization.
- On-device translation (Apple Foundation Models).
- DRM-free, no lock-in.
IO+ — the full practice.
Unlimited persona responses, AI search and discovery, your practice on every device. Founding price, locked in for early members.
A note on intent
Built for people who reread.
IO is made by KHHM, a California software lab working at the intersection of cognitive science and engineering. We don't build tools that read for you. We build environments that train the way you think.
— KHHM, est. 2025 About the lab →
Now available
Depth is becoming rare. Keep yours.
IO is now on the App Store. Download it on your iPhone and start reading deeper today.