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SPECIFICTION
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Kairo

kairoreader.com

Free plan Android
Visit kairoreader.com
Spec score 7.7 #16 of 27 in Speed Reading Apps

What it is

Kairo is a free Android app for reading DRM-free ebooks and documents in standard, adaptive RSVP, and Bionic Reading modes. The reader offers scrollable chapters, inline images, a table of contents, bookmarks, progress tracking, and a movable focus word. Adaptive RSVP aligns words with ORP and changes timing based on punctuation, word length, syllables, clauses, and readability. Bionic Reading emphasizes word beginnings while showing more sentence context. Reading profiles control pacing, typography, brightness, and focus, with six themes available. Focus mode provides a full-screen view and can optionally enable Android Do Not Disturb. Kairo 1.1 supports EPUB, MOBI, PRC, AZW, FB2, FB2.ZIP, DOCX, text-based PDF, TXT, Markdown, HTML, and HTM. Files must be DRM-free; scanned PDFs and OCR are unsupported. Imported content and reading data remain in private device storage.

Spec sheet

Product
Kairo is a free Android reading app for DRM-free ebooks and documents, with standard reading, adaptive RSVP and Bionic Reading modes.Read 9 Oct 2026 · kairoreader.com
Audience
Kairo is for Android users who want to read their own DRM-free ebooks and documents using standard or accelerated reading modes.Read 9 Oct 2026 · kairoreader.com
Privacy
Kairo says it has no account system, ads or analytics SDKs and does not upload users’ libraries or reading activity to a Kairo server.Read 9 Oct 2026 · kairoreader.com
Support
The site directs users with questions about files or features to [email protected] and links to a page to support Kairo.Read 9 Oct 2026 · kairoreader.com
Adaptive RSVP
Adaptive RSVP uses ORP alignment and adjusts timing based on punctuation, word length, syllables, clauses and readability.Read 9 Oct 2026 · kairoreader.com
Bionic Reading
Bionic Reading displays timed text chunks with emphasized word beginnings while keeping more sentence context visible.Read 9 Oct 2026 · kairoreader.com
File formats
Kairo 1.1 supports EPUB, MOBI, PRC, AZW, FB2 and FB2.ZIP, DOCX, text-based PDF, TXT, Markdown, HTML and HTM files.Read 9 Oct 2026 · kairoreader.com
File limitations
Files must be DRM-free; PDFs need selectable text, and Kairo does not support scanned PDFs or perform OCR.Read 9 Oct 2026 · kairoreader.com
Focus mode
Focus mode provides a full-screen reader and can optionally engage Android Do Not Disturb during reading sessions.Read 9 Oct 2026 · kairoreader.com
Internet use
Internet access supports Google Play’s flexible update flow; the site says it is not used to send reading data to a Kairo server.Read 9 Oct 2026 · kairoreader.com
Local storage
Imported files, extracted content, reading progress, bookmarks and preferences stay in app-private storage on the device.Read 9 Oct 2026 · kairoreader.com
Open source
Kairo is described as a native Kotlin and Jetpack Compose project whose code is available on GitHub.Read 9 Oct 2026 · kairoreader.com
Reader
The reader supports scrollable chapters, inline images, a table of contents, bookmarks, reading progress and a movable focus word.Read 9 Oct 2026 · kairoreader.com
Reading controls
Kairo offers reading profiles and controls for pacing, typography, brightness and focus, plus six reader themes.Read 9 Oct 2026 · kairoreader.com

Plans and prices

Kairo Free Free on Android 7.0 and newer · DRM-free files only Read 9 Oct 2026 · kairoreader.com

Every Kairo plan and price →

Strong points and limits

Strong points

  • Free on Android 7.0 and newer
  • Adaptive RSVP and Bionic Reading
  • Supports many document formats
  • Six reader themes
  • Local private storage

Limits

  • DRM-protected files are unsupported
  • Scanned PDFs and OCR are unsupported
  • Android-only platform
  • No account-based library synchronization

Who it suits

Kairo suits Android users reading their own DRM-free ebooks and documents. It is intended for readers wanting standard or accelerated reading modes without accounts, ads, or analytics SDKs.

Verdict

Kairo offers standard and speed-focused reading with extensive local file support and controls. Its DRM-free requirement, Android-only availability, and lack of scanned-PDF support define the main boundaries.

Where Specifiction places it

Alternatives to KairoAll alternatives →