Read like a cheetah

Leo shows your books one word at a time, right where your eyes already are. No more wandering lines, just you and the story, at the speed of your mind.

The science

What the studies actually say

vs
Normal readingWith Leo
No eye jumps

On a normal page, your eyes jump several times a second. Each jump is a chance to lose your place. Leo brings every word to the same spot, so your eyes can stay put.

Rubin & Turano (1992): reading was faster with RSVP than with text on a page.
Speed

Most of us read 200 to 250 words per minute on paper. With a fixed point and a pace you control, 300 to 600 words per minute becomes comfortable with practice.

You can change the speed at any moment. Leo never rushes you.
Comprehension

The honest answer: at moderate speeds comprehension holds up; at extreme speeds it drops for everyone. That is why Leo hands you the control instead of forcing a number.

Potter (1984): comprehension was maintained at moderate RSVP rates.
Focus

A single word on screen means there is nothing else to look at. RSVP has been used in attention research for decades precisely because it keeps your gaze on one point.

Forster (1970): the original RSVP reading experiments.
cheetah
Make it yours

Your reader, your rules

Theme, font, size, letter spacing, everything you tweak here is exactly what the app offers. Go ahead: this whole section obeys you.

Theme
Font
Size 42 px
Letter spacing 0 px
The library

Your library, your covers

Import your EPUB or PDF files and tell every book apart at a glance: keep the original cover if the file brings one, use a photo from your gallery, or pick a color and an icon.

Pick any book, the app's own controls on the right edit it live.

Edit book

Cover for Tales from the Savanna

Your photo never leaves this page, we don't store it, it's just to try.

MONTHLY STREAK12 days in a row
Best 14
Minutes4 / 5 min
Words820 / 1,050 words
June 2026
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Reading speed

450324
1 month ago+11% fasterlast session
WORDS READ1.8k this month
1.8k
TIME READ19 min this month
19 min
DAILY AVERAGEReading days only
12 min

Words read

This week
349145
Your progress

Stats that cheer you on

Words per day, reading speed over time, daily goals and a streak calendar. Leo turns consistency into something you can see.

  • Set your own daily goals, minutes and words read, and watch them fill as the day goes.

  • Streak calendar, words per week and reading speed over time: every stat to follow your progress.

Try it now

Tune the reader to your eyes

This is the real thing, the same engine the app uses. Press play, then make it yours.

Leo
Chapter 3
Leo settled by the window and let the story run toward him. At first it took effort to keep up, but soon he discovered something: his mind could go much faster than he had ever believed. Each sentence arrived at the right moment, never Chapter illustrationearly, never late. He read the way a cheetah crosses the plain, pure motion, pure attention. When he looked up, the afternoon had turned to night, and three chapters were behind him.
1 / 76
Punctuation pausesBrief pause at commas, longer at full stops, like a narrator breathing.

Your own books, as they are

Leo reads the EPUB and PDF files you already own. No store, no conversions, no lock-in.

If your EPUB has images, they appear right in the reading context, you don't lose a single illustration while you read.

FAQ

Questions, answered

Does Leo include books?

No, Leo is a reader, not a store. You import your own EPUB and PDF files and Leo turns them into a speed-reading experience.

Does it work with Kindle books?

Kindle uses a closed format, so not directly. DRM-free EPUB and PDF files work perfectly.

Which devices does it run on?

iPhone, for now. That focus lets us make the reader feel truly native.

Will I understand what I read at higher speeds?

Studies show comprehension holds at moderate RSVP speeds and drops at extreme ones. Leo gives you full control of the pace, plus punctuation pauses, so you find your own sweet spot.

Which languages does the app support?

The interface is in English, Spanish and French, and you can read books in any language.

How much will it cost?

To be announced. The waitlist will be the first to know, and the first to try it.

Be the first to read with Leo

Leave your email and we'll write to you when Leo lands on the App Store. No spam, cheetah's honor.