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Head-to-head · File Reader Software

KOReader vs MuPDF

  • Updated Sep 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score KOReader #5 in File Reader Software 7.1/10 Free plan Free plan✓ 1 of 4 features Visit KOReader
MuPDF #8 in File Reader Software 6.7/10 Free plan · paid from $299/mo · 14-day trial Free plan✓ 1 of 4 features Visit MuPDF

KOReader leads on 0 checks, MuPDF on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreKOReader · 7.1/10
  • Free planboth

KOReader scores higher on our rubric for file reader software: 7.1 against 6.7 out of 10; our editors rank them #5 and #8.

KOReader is the better fit for open-source readers across ebook and document formats. MuPDF is the better fit for teams needing PDF rendering and document manipulation.

  • KOReader fits best

    Open-source readers across ebook and document formats

  • MuPDF fits best

    Teams needing PDF rendering and document manipulation

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. It never changes our verdict. How we rank.

Side by side

Feature KOReader 7.1/10 Visit ↗ MuPDF 6.7/10 Visit ↗
At a glance
Editor score 7.1 6.7
Ranking #5 in File Reader Software #8 in File Reader Software
Best for Open-source readers across ebook and document formats Teams needing PDF rendering and document manipulation
Pricing model Free Free plan + paid
Starting price Not published Not published
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted, Desktop, Mobile Cloud, Self-hosted, Browser extension
Platforms Linux, macOS, Android Web, Linux, Windows, macOS
Support Community, Docs Email
Built for Solo Small business, Mid-market, Enterprise
Features KOReader 1/4 · MuPDF 1/4
Annotations ✓ ✓
Text search Not published Not published
Accessibility support Not published Not published
Cloud sync Not published Not published
Specs
Supported formats Not published Not published
Platforms Kindle, Kobo, PocketBook, Android, desktop Linux; macOS emulator Not published
Our review
Pros
  • Opens ebook and document formats including EPUB, PDF, DjVu, and MOBI
  • Customizable typography, search, bookmarks, and highlights
  • Calibre integration and optional cross-device reading-position sync
  • Renders PDFs and other supported document formats across platforms
  • Combines annotation, redaction, signing, extraction, and file manipulation
  • Offers source-code releases under the AGPL and command-line tools
Cons
  • Platform coverage varies across e-readers, Android, Linux, and macOS emulator
  • Progress Sync requires a separate copy of the document on each device
  • Bookmarks and highlights are supported, but note-taking is not
  • WebViewer Commercial costs $299 per license per month
  • Commercial licenses cover one domain each
  • The WebViewer is licensed separately from MuPDF source-code releases
Our verdict

KOReader is a free, open-source document reader aimed primarily at E Ink devices, with versions also available for Android and desktop Linux. It suits solo readers who want control over typography and access to ebook and fixed-page…

Read the review →

MuPDF is a document engine and PDF viewer from Artifex Software, suited to developers and teams that need document rendering and manipulation rather than only a basic reader. Its offerings include a C library, command-line tools, language…

Read the review →
  1. KOReaderFile Reader Software 7.1Free plan
  2. MuPDFFile Reader Software 6.7Free plan · paid from $299/mo · 14-day trial

Strengths and trade-offs

  • KOReader — where it wins

    • Opens ebook and document formats including EPUB, PDF, DjVu, and MOBI
    • Customizable typography, search, bookmarks, and highlights
    • Calibre integration and optional cross-device reading-position sync

    Where it doesn't

    • Platform coverage varies across e-readers, Android, Linux, and macOS emulator
    • Progress Sync requires a separate copy of the document on each device
    • Bookmarks and highlights are supported, but note-taking is not

  • MuPDF — where it wins

    • Renders PDFs and other supported document formats across platforms
    • Combines annotation, redaction, signing, extraction, and file manipulation
    • Offers source-code releases under the AGPL and command-line tools

    Where it doesn't

    • WebViewer Commercial costs $299 per license per month
    • Commercial licenses cover one domain each
    • The WebViewer is licensed separately from MuPDF source-code releases
  • KOReader7.1/10 · Free plan

    A format-flexible reader with annotations, PDF controls, and optional reading-position sync.

    Visit KOReaderFull verdict →
  • MuPDF6.7/10 · Free plan · paid from $299/mo · 14-day trial

    A cross-platform PDF toolkit for rendering, extraction, annotation, and document editing.

    Visit MuPDFFull verdict →

More comparisons

All file reader software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update