Seriatim Is The App That Makes Reading Easy—One Sentence At A Time

Q: Is Seriatim good for ADHD?

Yes. The single-sentence format removes the visual distractions that make standard ebook layouts difficult for readers with ADHD, and the full-screen mode eliminates notification banners and status bar clutter that can break focus mid-sentence.

Edited by:

Jessica Santero Staff Writer

Updated 02 June 2026

Contents

Jump to:

What is Seriatim?
Customization options
Should I use Seriatim?
How WhistleOut reviews apps
FAQ

There are days when I sit down with a book and cannot get a single paragraph to stick. Tired eyes, a distracted brain, too much screen time earlier in the day. Whatever the reason, the wall of text on the page feels like a wall.

Seriatim solves that problem by removing the wall entirely, and it's one of WhistleOut's top picks in the full guide to the best book apps for exactly that reason. Instead of a page of text, you see one sentence at a time, centered on a clean screen, at whatever pace you set.

Download Seriatim now:

Free on iOS and Android
No subscription required. Bring your own EPUBs or PDFs.

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What is Seriatim?

Seriatim is a free ebook reader that displays one sentence at a time on a fully customizable screen. It was designed with dyslexic readers and people with ADHD in mind, but the single-sentence format is useful for anyone who struggles with dense text layouts.

You import your own EPUB or PDF files and read through them at a pace you control. There is no built-in bookstore and no subscription tier required to access the features that matter.

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One sentence at a time changes everything about reading

Standard ebook readers give you a page. Seriatim gives you a sentence. Each sentence appears on its own, centered on the screen, and you advance to the next one with a tap.

There is no paragraph to scan ahead into, no wall of text to lose your place in, and no margin distractions to pull your eye away. For readers who habitually re-read the same line three times before it sticks, this format is a significant upgrade.

Seriatim app displaying one sentence at a time on a clean reading screen

Seriatim strips the reading experience down to one sentence at a time. There's no wall of text to get lost in.
Image: Jessica Santero | WhistleOut

The pacing is entirely up to you. You can tap through manually, or set Seriatim to advance automatically at a reading speed you define. It fits the text to your full screen, which also helps eliminate the notification banners and status bar distractions that creep in at the edges of a standard reader.

Every visual setting is adjustable

Font, size, line spacing, background color, and text color are all adjustable. Seriatim includes a dedicated dyslexia-friendly font that reduces the letter confusion common with standard typefaces. A sweeping animation for text transitions is available for readers who find motion helpful for focus, and a red-tinted screen mode works well for reading before bed without straining your eyes.

Seriatim app customization screen showing font and display settings

Seriatim app font choice options including dyslexia-friendly typeface

Font, size, spacing, speed, and screen color are all adjustable. You can fully tailor the reading experience to what your eyes actually need.
Image: Jessica Santero | WhistleOut

Seriatim accepts your own EPUB and PDF imports, so any book you already own can take advantage of the dyslexia-friendly formatting. You're not limited to a specific catalog or locked into purchasing titles through the app. Grab a free EPUB from Project Gutenberg, import it, and start reading in under a minute.

Who Seriatim is actually best for

Seriatim works best for readers with dyslexia, ADHD, or visual processing difficulties that make standard text layouts overwhelming. It also works well for anyone who reads late at night, reads on a small screen, or simply struggles to stay focused through dense chapters. The format enforces attention in a way that a standard ebook reader cannot. If you've quit books halfway through more times than you'd like to admit, Seriatim is worth trying before you write off reading entirely.

How I tested Seriatim

Hands-on testing
Imported multiple EPUB and PDF titles and read across several customization configurations over an extended period, including late-night reading sessions with the red-tinted screen mode.
Accessibility evaluation
Tested each font option, including the dyslexia-friendly typeface, and evaluated the sweeping text animation and full-screen mode for focus impact.
File import testing
Assessed EPUB and PDF import from multiple sources to confirm the process works reliably without a paid tier or in-app purchase.

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Seriatim FAQ

Is Seriatim free?

Yes, Seriatim is completely free to download and use. There is no premium subscription tier required to access the dyslexia-friendly fonts, customization settings, or file import features.

What file types does Seriatim support?

Seriatim supports EPUB and PDF imports from your device. You can bring any ebook you already own into the app and read it in the one-sentence format with full display customization applied.

Is Seriatim good for ADHD?

Yes, Seriatim is great for ADHD and dyslexic readers. The single-sentence format removes the visual distractions that make standard ebook layouts difficult for readers with ADHD, and the full-screen mode eliminates notification banners and status bar clutter that can break focus mid-sentence.

Does Seriatim have a built-in book library?

Seriatim includes a small selection of pre-installed classic titles, but it is not a bookstore. The app is designed around importing your own EPUB or PDF files rather than purchasing content through the app itself.

Jessica Santero

Staff Writer

Jessica is a Staff Writer for WhistleOut and the site’s resident app expert. Her coverage frequently includes hands-on comparisons of popular app categories, such as translation, navigation, and dating apps, to evaluate how they perform in real-world mobile use.

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