Readest vs KOReader

Readest9.4Visit KOReader8.6Visit

Higher score Readest #1 in Ebook Reader Software 9.4/10 Free plan Free plan✓ 3 of 3 features Visit Readest

vs

KOReader #6 in Ebook Reader Software 8.6/10 Free plan Free plan✓ 2 of 3 features Visit KOReader

• Readest fits best

  Cross-platform readers and annotation-heavy workflows

• KOReader fits best

  Open-source readers using ereaders and Calibre

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Side by side

Feature	Readest 9.4/10 Visit ↗	KOReader 8.6/10 Visit ↗
At a glance
Editor score	9.4	8.6
Ranking	#1 in Ebook Reader Software	#6 in Ebook Reader Software
Best for	Cross-platform readers and annotation-heavy workflows	Open-source readers using ereaders and Calibre
Pricing model	Free plan + paid	Free
Starting price	$4.99/mo	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Cloud, Self-hosted, Desktop, Mobile	Self-hosted, Desktop, Mobile
Platforms	Web, Windows, macOS, Linux, iOS, Android	Linux, macOS, Android
Support	Email, Community, Docs	Community, Docs
Integrations	9 integrations	4 integrations
Built for	Solo, Small business, Mid-market	Solo
Features Readest 3/3 · KOReader 2/3
Annotation tools	✓	✓
Reading sync	✓	✓
Offline reading	✓ (best)	Not checked yet
Specs
Supported platforms	web, Windows, macOS, Linux, iOS, Android	Kindle, Kobo, PocketBook, Android, desktop Linux; macOS emulator
Supported formats	EPUB, PDF, MOBI, AZW, AZW3, FB2, CBZ, ZIP, TXT, Markdown	EPUB, PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, DOC, MOBI, ZIP
Library storage	0.5 GB	Not checked yet
Our review
Pros	Runs on web, desktop, and mobile platforms Supports broad ebook, document, comic, and text formats Exports notes and excerpts to Markdown, text, or JSON	Opens ebook and fixed-page formats including EPUB, PDF, DjVu, and MOBI Calibre tools cover metadata search, wireless transfers, and OPDS browsing Custom typography, bookmarks, highlights, and PDF controls support varied reading
Cons	Cloud storage is part of paid plans Advanced AI tools are limited to the Pro Plan Support varies from community support to priority support	Progress Sync works between KOReader devices, and each needs its own document copy The wiki says note-taking is not supported macOS is listed via emulator rather than as a native platform
Our verdict	Readest is an open-source ebook reader for people who read across devices and formats. It runs on the web, Windows, macOS, Linux, iOS, and Android, with support for EPUB, PDF, MOBI, AZW/AZW3, FB2, CBZ/ZIP, TXT, and Markdown. Its reading… Read the review →	KOReader is a free, open-source document reader aimed primarily at E Ink devices, with versions for supported ereaders, Android, and desktop Linux. It suits readers who want control over typography and a broad choice of ebook and… Read the review →

Strengths and trade-offs

• Readest — where it wins

  • Runs on web, desktop, and mobile platforms
  • Supports broad ebook, document, comic, and text formats
  • Exports notes and excerpts to Markdown, text, or JSON

  Where it doesn't

  • Cloud storage is part of paid plans
  • Advanced AI tools are limited to the Pro Plan
  • Support varies from community support to priority support

• KOReader — where it wins

  • Opens ebook and fixed-page formats including EPUB, PDF, DjVu, and MOBI
  • Calibre tools cover metadata search, wireless transfers, and OPDS browsing
  • Custom typography, bookmarks, highlights, and PDF controls support varied reading

  Where it doesn't

  • Progress Sync works between KOReader devices, and each needs its own document copy
  • The wiki says note-taking is not supported
  • macOS is listed via emulator rather than as a native platform

• Readest9.4/10 · Free plan

  A cross-platform ebook reader for broad format support and detailed annotations.

  Visit ReadestFull verdict →
• KOReader8.6/10 · Free plan

  A free, open-source reader with broad format support and deep Calibre integration.

  Visit KOReaderFull verdict →