FBReader vs KOReader

FBReader9.1Visit KOReader8.8Visit

Higher score FBReader #3 in File Reader Software 9.1/10 Free plan Free plan✓ 0 of 4 features Visit FBReader

vs

KOReader #5 in File Reader Software 8.8/10 Free plan Free plan✓ 1 of 4 features Visit KOReader

• FBReader fits best

  Readers who want broad-format ebook support

• KOReader fits best

  Open-source readers across ebook and document formats

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Side by side

Feature	FBReader 9.1/10 Visit ↗	KOReader 8.8/10 Visit ↗
At a glance
Editor score	9.1	8.8
Ranking	#3 in File Reader Software	#5 in File Reader Software
Best for	Readers who want broad-format ebook support	Open-source readers across ebook and document formats
Pricing model	Free plan + paid	Free
Starting price	—	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop, Mobile	Self-hosted, Desktop, Mobile
Platforms	Windows, macOS, Linux, iOS, Android	Linux, macOS, Android
Support	Community, Docs	Community, Docs
Integrations	4 integrations	4 integrations
Built for	Solo, Small business	Solo
Features FBReader 0/4 · KOReader 1/4
Annotations	Not checked yet	✓ (best)
Text search	Not checked yet	Not checked yet
Accessibility support	Not checked yet	Not checked yet
Cloud sync	Not checked yet	Not checked yet
Specs
Supported formats	Not checked yet	Not checked yet
Platforms	Not checked yet	Kindle, Kobo, PocketBook, Android, desktop Linux; macOS emulator
Our review
Pros	Reads EPUB, FB2, MOBI, HTML, RTF, and plain text Offers bookmarks, synced reading position, and customizable layouts Runs on Windows, macOS, Linux, iOS, and Android	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
Cons	PDF and comics support is included with Android Premium The free iOS edition limits the library to ten books Some mobile features, including network translators, require a paid edition	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
Our verdict	FBReader is an ebook reader for people who want to read across desktop and mobile devices without being tied to a single book format. It supports EPUB and FB2, along with MOBI, HTML, RTF, and plain text, and it can open Readium… Read the review →	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 →

Strengths and trade-offs

• FBReader — where it wins

  • Reads EPUB, FB2, MOBI, HTML, RTF, and plain text
  • Offers bookmarks, synced reading position, and customizable layouts
  • Runs on Windows, macOS, Linux, iOS, and Android

  Where it doesn't

  • PDF and comics support is included with Android Premium
  • The free iOS edition limits the library to ten books
  • Some mobile features, including network translators, require a paid edition

• 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

• FBReader9.1/10 · Free plan

  A format-flexible ebook reader with free desktop editions and optional paid mobile features.

  Visit FBReaderFull verdict →
• KOReader8.8/10 · Free plan

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

  Visit KOReaderFull verdict →