Read at the speed of attention

Your eyes stay still.
Your story moves.

Focusline shows one word at a time, anchored at its natural recognition point. Import an EPUB or PDF, choose your pace, and let the page disappear.

Your files are processed locally and never uploaded.

THE ART OF FOCUS420 WPM
attention
Chapter 112 min left

Your reading room

Library

0 books

Your shelf is ready.

Bring a DRM-free EPUB, a PDF, or a plain text file. The native iPhone app can privately OCR scanned PDFs.

Reader

Reading settings

Pace

Reading speed420 WPM

Playback

ContextShown beneath the word

Appearance

Word sizeKeep the focal letter comfortable

Library

Remove this book?

The book and its reading progress will be removed from this iPhone.

Find your place

Source-linked note

Save this idea

Color

Add to your library

Import a book

DRM-free EPUB PDF · native scan OCR Never uploaded

Private and on this device

Account & Sync

Sign in once to carry your reading and listening position between iPhones. Your library stays on this device unless you explicitly enable encrypted complete-book sync.

Private Ten2 sync

Checking…

End-to-end encrypted before it leaves this device. Ten2 stores unreadable ciphertext and never receives your private-sync password.

Sign in to Ten2

Use your Ten2 account to sync encrypted progress, settings, notes, and reviews.

Checking your Ten2 session…

Checking storage…Asking this browser about local space.
0%
Usage unavailableFree space unavailable

The estimate covers this browser’s Focusline data and offline app files.

Back up your library

Includes extracted text, progress, bookmarks, and reading settings.

No backup exported yet
Restore a backup

Newer progress wins. ID collisions are imported as separate copies.

Encrypted backups keep extracted book text private outside this device.

Private reader account

Sign in to Ten2

Your Ten2 account authorizes storage. Your separate private-sync password encrypts the content before it leaves this device.

Use the same Ten2 account on every device. New accounts are activated by your Ten2 administrator.

Three short passages

Find your pace

Focusline will adapt across three original passages. After each one, answer a quick meaning question and tell us how the pace felt.

About 1 minutePause whenever you need Comprehension firstNo score and no failure Stays privateOnly saved on this device

Section complete

Quick recall

Before looking back, could you explain the main idea of what you just read in one sentence?

Section review

Review inbox

Bring the idea back

Day 1

Without looking back, explain the main claim, how it works, and the evidence or example.

Three quick steps

Put Focusline on your Home Screen

It opens without browser chrome, keeps imported books on your iPhone, and can work offline once its first load finishes.

  1. Open Focusline in Safari

    Tap Share — or tap More , then Share.

  2. Add it to your Home Screen

    Scroll through the actions and tap Add to Home Screen.

  3. Make it an app

    Leave Open as Web App turned on, then tap Add.

Use the same Ten2 account and private-sync password. Reading progress syncs while unlocked; complete-book transfer remains optional.

Keep your hands on the keys

Keyboard shortcuts

Play / pauseSpace Previous / next word← → Back / forward 10 wordsJ L Speed up / down↑ ↓ Previous / next chapter[ ] Replay sentence / navigatorR N Focus modeF Sentence / page contextD Expanded page viewV ThemeT

On-device neural voice

Listen naturally

Supertonic reads the full book locally. Reading and listening share one position, and your book text never leaves this iPhone.

Current passage 1 of 1
Choose a passage to begin listening.
Book progress 0%
0:00 Calculating time left…
Neural engine readyTap play to generate this passage on your iPhone.

Offline model: approximately 400 MB. The native iPhone build keeps it on the device and generates audio locally.