iOS speed reader · RSVP

Read at the speed of thought.

Caff flashes your text one word at a time, pinned to a single focal point. Your eyes stop darting across the page — so you read articles, docs, and email in a fraction of the time, and spend what's left actually thinking.

Get on App Store See how it works
One-time $9.99 · pay once, read forever. No subscription.
9:41
Reading420 wpm
Caff
1/33~5s
up to 3×
faster through the same text
0
eye movement, by design
$0/yr
after you buy it once
How it works

Your eyes are slow. The words are fine.

Ordinary reading spends most of its time on tiny eye jumps — finding the next word, refocusing, occasionally backtracking. Caff removes the jumps. The words come to one place; you just look.

The optimal recognition point
compr e hension
fo c us
mo m entum

Caff lines every word up on the one letter your brain uses to recognise it, and marks it. The focal point never moves — only the words do.

1
Bring the text
Paste it, share an article from Safari, or open a PDF or ePub. Caff cleans it up into plain words.
2
Set your pace
Pick a words-per-minute that feels readable. Adjust it live, any time, with a thumb.
3
Let the words come
One word at a time, on the focal point. Tap to pause, swipe to replay a sentence. That’s the whole interface.
What's inside

A reader, not a feed.

SPEED

From a stroll to a sprint, mid-sentence.

Start gentle while you warm up, then push the dial. Caff also paces itself — lingering on long words and punctuation so meaning has somewhere to land.

150 to 1,000+ words per minute

Adjust speed live without losing your place

Automatic dwell on long words, commas, and full stops

A gentle ramp-up at the start of each session

450
words / minute
1505001000+
+ pause on “.”+ dwell on long words+ ramp-up
IMPORT

If you can read it, you can pour it in.

No special format, no copy-paste gymnastics. Send an article over from Safari and Caff strips the clutter; open a book from Files; or just paste whatever's on your clipboard.

Share-sheet article capture from Safari (reader-cleaned)

Paste from clipboard — any length

PDF, ePub, plain text, and Markdown

Everything lands in your library to read later

9:41
New read
Bring some text
Reading is the act of linking one …
1,284 words · ~3 min
Paste from clipboard
anything you've copied
Share from Safari
articles, cleaned up
PDF & ePub
open from Files or Books
Plain .txt / Markdown
drop it in
Start reading →
LIBRARY & STATS

Everything you're reading, in one quiet shelf.

Each text remembers exactly where you stopped and how fast you were going. A simple stats strip shows your pace and roughly how much time you've saved — no streaks, no nagging.

Resume any text on the exact word you left

Per-text speed and progress

Average WPM and time-saved at a glance

No streaks to break, no guilt mechanics

9:41
Library
Your reads
31
this week
452
avg wpm
2.4h
time saved
The Pragmatic Programmer
Ch. 4 · 480 wpm
Annie Dillard — Total Eclipse
essay · 5 min left
Stripe API changelog
pasted · 420 wpm
How to do great work
paulgraham.com
Read
Library
Import
Stats
The small stuff

Details that make it feel calm.

Pivot

The letter your eye lands on.

Every word is aligned on its optimal recognition point — one letter, marked, always in the same spot. Your gaze stops hunting.

Comfort

Reduced-motion mode.

No slide, no fade. Words simply replace each other. For eyes and brains that find movement noisy.

Fonts

Including a dyslexia-friendly face.

Pick the typeface that reads easiest for you, size it up, and Caff remembers it everywhere.

Control

Tap to pause. Flick to rewind a sentence.

Lost the thread? One tap stops the stream; swipe back to replay the last sentence at the same pace. No scrubbing through a wall of text.

Pacing

It slows down where you would have.

Caff lingers a beat on long words, commas, and full stops, then picks the pace back up — the rhythm you read with anyway, automated.

Dark

Pitch-dark reading mode.

White word on true black. Easy at 1am.

Haptic

A tick per word, optional.

A faint pulse keeps the rhythm without sound.

Resume

Always picks up where you stopped.

Close mid-paragraph; reopen on the same word.

Offline

Works on a plane.

No connection needed once the text is in.

Privacy

Whatever you read stays yours.

No accounts. No server we can read. No analytics watching your taps. We don't have somewhere to put your reading, because we never wanted it.

On-device by default.
Imported text, your library, positions, and stats live in your phone’s local storage. They are never sent to us.
No account, ever.
You never make one. There’s nothing to sign into, nothing to leak, nothing to delete from a database.
Articles fetch directly.
When you import a web page, your phone requests it straight from the source. We don’t proxy it and never see the URL.
No tracking, no ads.
There is no analytics SDK, no advertising, no profiling. The only telemetry is whatever you choose to send Apple.

Read the full Privacy Policy.

Pricing

One price. Once.

Caff is a finished tool, not a monthly habit. Pay once, get every feature, and keep every future update for as long as the app exists.

$ 9.99
Pay once. Read forever. All future updates included.
  • Unlimited texts, unlimited reading
  • 150–1,000+ wpm with smart pacing
  • Import from Safari, clipboard, PDF & ePub
  • Library with resume, stats, and time saved
  • Dark mode, dyslexia-friendly font, reduced motion
  • Universal — iPhone, iPad, and Apple-silicon Mac
  • No accounts. No tracking. No ads. Ever.
Get Caff on the App Store
How that compares
Caff
one-time
Subscription readers
Year 1
$9.99
~$50
Year 2
$0
~$50
Year 3
$0
~$50
Every year after
$0
~$50
Locked out if you stop paying
Never
Usually
Account required
No
Usually yes
Estimate based on a typical $4.99/mo reading-tool subscription. Reading shouldn't be a recurring bill.
Questions

Before you download.

Is Caff really a one-time purchase?
Yes. $9.99 once on the App Store. No subscription, no “Pro” tier, no in-app purchases. Every feature on this page is included, and future updates are too.
What is RSVP reading, exactly?
Rapid Serial Visual Presentation. Instead of moving your eyes across lines, Caff flashes the words to you one at a time at a single fixed point. The time your eyes normally spend jumping between words (called saccades) disappears, so the same text takes less time — often 1.5–3× less.
Will I actually understand what I read?
For most everyday reading — articles, emails, documentation, news — comprehension holds up well at moderate speeds, and Caff’s smart pacing pauses on punctuation to give sentences room to land. For dense or technical material, drop the speed or use the sentence-rewind. It’s a tool, not magic: you set the pace that keeps it readable for you.
What can I bring into Caff?
Paste anything from the clipboard, share an article straight from Safari (Caff strips the menus and ads and keeps the words), or open a PDF, ePub, plain-text, or Markdown file from Files or Apple Books. It all lands in your library.
Does my text leave my phone?
No. Caff has no account system and no server of its own. The text you import, your library, your positions, and your stats live on your device. When you import a web article, your phone fetches that page directly — we never see it. There’s no analytics SDK and no ads.
How fast can it go?
From a gentle 150 words per minute up past 1,000. Most people settle somewhere between 350 and 600. You can nudge the speed live while you read.
Android?
iOS only for now. We’d rather do one platform well than half-port. If you’re Android-first, follow along — we’ll announce a port when it’s real, not when it’s planned.
iPad and Mac?
Caff is a universal app — it runs on iPhone and iPad, and on Apple-silicon Macs through the iOS app. One purchase covers all your devices on the same Apple ID.