Kairo: RSVP Reader

Content rating
Everyone
500+
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Content rating
Everyone
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About this app

Kairo Reader is a free, open-source RSVP reader and ebook reader designed for focused, distraction-free reading.

Read EPUB, MOBI, PRC, AZW, FB2, PDF, DOCX, TXT, Markdown and HTML files using Rapid Serial Visual Presentation (RSVP), a reading method that displays text word by word at a pace you control.

Instead of constantly moving your eyes across a page, Kairo keeps words in one focused reading position. Choose your reading speed and work through books, documents, articles and study material with less visual clutter.

FEATURES

• RSVP reading with adjustable reading speed
• Import your own books and documents
• EPUB, MOBI, PRC, AZW and FB2 support
• PDF and DOCX support
• TXT, Markdown and HTML support
• Clean, minimal reading interface

• Designed for focused, distraction-free reading

• Completely free and open source

SUPPORTED FORMATS

Ebooks: EPUB, MOBI, PRC, AZW, FB2

Documents: PDF, DOCX

Text and web: TXT, Markdown, MD, HTML

FOCUSED READING WITH RSVP

RSVP, or Rapid Serial Visual Presentation, presents text sequentially in a fixed position.

Rather than scanning back and forth across a page, Kairo lets you keep your attention in one place while words appear at the speed you choose.

Read at a comfortable pace or increase the speed when you want to move through material more quickly.

MORE THAN AN EBOOK READER

Kairo isn't limited to EPUB books. You can import PDFs, Word documents, Markdown files, text files and HTML content into the same focused reading experience.

Use Kairo for novels, articles, coursework, research material, personal notes and other documents.

CALM BY DESIGN

Kairo keeps the interface intentionally minimal so your reading stays at the centre of attention.

No clutter or unnecessary distractions. Just your files, your pace and your focus.

FREE AND OPEN SOURCE

Kairo Reader is completely free and open source.

Digital reading tools should help you focus on what you're reading, not get in the way.
Read EPUBs, PDFs and ebooks faster with a focused RSVP speed reading app.
Updated on
Oct 11, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
    Learn more about how developers declare collection

What’s new

- Performance improvements and bug fixes
- New theme studio with custom colours, fonts, live previews and saved designs.
- Smoother RSVP pacing, natural phrasing and simpler reading-support controls.
- Clearer word guidance and improved contrast across themes.
- More reliable reading progress, chapter navigation and position restoration.
- Improved book imports, passage search and Focus mode behaviour.
- Optional “What’s new” walkthroughs and a changelog in Settings.
Content rating
Everyone
Learn more

App support

About the developer
Edward Kemp
kairoapp@proton.me
United Kingdom

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