read your book in Reels.

Finally finish the classics.

Thousands of public-domain classics, one paragraph per swipe, with an AI that reads with you, not for you.

Download on the App Store Get it on Google Play

The library and both reading modes are free. IO+ is $2.99 a month for unlimited companions.

01

REELS

One paragraph fills the screen.

Swipe up and the next paragraph takes the screen. One paragraph, your full attention, then the next.

02

SENTENCE CARDS

Or one sentence at a time.

Tap the mode toggle and the same paragraph splits into cards. Slow is a feature.

03

READING COMPANIONS

A companion for the page you are on.

Tap AI and a reading companion opens over the passage on screen. It works on that passage, not on a summary of the book.

01

REELS

One paragraph fills the screen.

Swipe up and the next paragraph takes the screen. One paragraph, your full attention, then the next.

02

SENTENCE CARDS

Or one sentence at a time.

Tap the mode toggle and the same paragraph splits into cards. Slow is a feature.

03

READING COMPANIONS

A companion for the page you are on.

Tap AI and a reading companion opens over the passage on screen. It works on that passage, not on a summary of the book.

04

TWELVE READING COMPANIONS

Twelve reading companions, one for every page.

Historian, Psychologist, Vocab Coach and nine more read alongside you. Tap a card to read the real response IO reader gave.


05

KEEPSAKE BOX

The lines that stopped you, kept.

Like a sentence and it goes to your Keepsake Box, under its chapter, with your note attached. A shelf of your own underlinings, not the whole book again.

The Keepsake Box in IO reader: saved passages from Meditations under their chapters, each with its note

06

SHARE CARD

A line worth keeping, typeset to share.

When a sentence stops you, export it as a typeset quote card: the line and its attribution, set in the same serif as the page it came from. The one thing in IO reader designed to leave the app.

A share card from IO reader: a serif Marcus Aurelius quote from Meditations on cream, with its attribution

07

THE LIBRARY

Thousands of classics, free and unabridged.

Search any author. Standard Ebooks editions first. Bring your own EPUB and web articles; no lock-in.

Cover credits
  • White Nights: Vincent van Gogh, Starry Night Over the Rhône (1888), public domain — substitute art, not the edition cover
  • Notes from Underground: Standard Ebooks CC0 cover, fyodor-dostoevsky/notes-from-underground/constance-garnett
  • Crime and Punishment: Standard Ebooks CC0 cover, fyodor-dostoevsky/crime-and-punishment/constance-garnett
  • Meditations: Standard Ebooks CC0 cover, marcus-aurelius/meditations/george-long
  • Pride and Prejudice: Standard Ebooks CC0 cover, jane-austen/pride-and-prejudice
  • Frankenstein: Standard Ebooks CC0 cover, mary-shelley/frankenstein
  • Moby Dick: Standard Ebooks CC0 cover, herman-melville/moby-dick
  • Anna Karenina: Standard Ebooks CC0 cover, leo-tolstoy/anna-karenina/constance-garnett
  • The Picture of Dorian Gray: Standard Ebooks CC0 cover, oscar-wilde/the-picture-of-dorian-gray
  • Walden: Standard Ebooks CC0 cover, henry-david-thoreau/walden
  • The Great Gatsby: Standard Ebooks CC0 cover, f-scott-fitzgerald/the-great-gatsby
  • Dracula: Standard Ebooks CC0 cover, bram-stoker/dracula

08

WHAT TO READ NEXT

Never stuck for the next book.

Home opens on For You, a shelf built from how you read, for IO+ members, and on curated lists anyone can browse. Search carries the Issue, an editorial selection refreshed regularly, so there is always something chosen to open next.

IO reader's Home: Continue Reading, For You, and a curated list of books
IO reader's Search tab opening on the Issue, an editorial selection of books

09

EXACTLY WHAT IT LOOKS LIKE

Captured from the shipped app.

iPhone and Android.

Reels mode showing Notes from Underground, captured from the shipped app Sentence cards mode showing White Nights, captured from the shipped app
The Critical Thinker answering on the passage, captured from the shipped app
The AI sheet, with all 12 personas a tap from the passage.
The Translator answering on the passage, captured from the shipped app The Vocab Coach answering on the passage, captured from the shipped app The Note-Taker answering on the passage, captured from the shipped app IO+ paywall Android — Reels Android — sentence cards Android — the AI sheet

10

THE SAME PAGE, ELSEWHERE

The same page, in IO reader and elsewhere.

IO readerKindleApple BooksSerial ReaderBlinkist
One paragraph per screen (Reels)YesNoNoNoNo
One sentence per screen (cards)YesNoNoNoNo
AI that works on the passage, never summarizes12 companionsAsk this Book (Q&A)NoNoSummaries only
Public-domain classics freeThousandsMany, in the storeSome800+No (summaries)
Import your own EPUBYesSend-to-KindleYesNoNo

11

PRICE

Free forever. IO+ when you want more.

Free to read. Pay only for more companions.

Free

$0

  • The full library, both reading modes
  • Themes, notes, and streaks
  • 100 Advanced-model reading-companion responses to start, then five a month

IO+

$2.99/mo

or $24.99/yr

  • Unlimited responses from all twelve reading companions
  • AI search across the library
  • AI For You
  • Cross-device sync

Frequently asked questions

Does the AI summarize the book?

No. Every reading companion is instructed not to summarize; each one works on the passage in front of you — context, craft, motive, vocabulary, questions. The Questioner is the only one that turns toward you, and it asks rather than tells.

Is IO reader free?

Yes. The full library, both reading modes, themes, notes and streaks are free. Free includes 100 Advanced-model reading-companion responses to start, then five a month. IO+ is $2.99 a month or $24.99 a year for unlimited reading companions, AI search, AI For You and cross-device sync.

Can I read my own EPUB files?

Yes. Import any DRM-free EPUB or save a web article; they read in Reels and cards like everything else.

Is it on Android?

Yes, on Google Play (Android 10 and later) since September 2026, alongside iPhone.

Which translations are used?

Public-domain editions, named on every book page — Constance Garnett for Dostoevsky and Tolstoy, George Long for Marcus Aurelius.

What does "Reels" mean for a book?

One paragraph fills the screen; swipe up for the next. Tap the toggle for one sentence at a time. It is the book, unabridged, in the gesture you already use.


12

A NOTE ON INTENT

Built for people who reread.

IO reader is built on an unfashionable idea: that reading should change you, not just pass through you. The evidence we gathered says depth compounds over a reading life, and that the dose that matters is the habit. So every part of the app protects the habit: the whole book, one paragraph at a time; companions that work on the passage instead of summarizing it; a box for the lines that kept you.