Software Alternatives, Accelerators & Startups

KOReader VS Document Viewer

Compare KOReader VS Document Viewer and see what are their differences

KOReader logo KOReader

An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on...

Document Viewer logo Document Viewer

Document Viewer is a highly customizable document viewer for Android. - SufficientlySecure/document-viewer
  • KOReader Landing page
    Landing page //
    2022-03-18
  • Document Viewer Landing page
    Landing page //
    2023-07-27

KOReader features and specs

  • Open Source
    KOReader is an open-source project, allowing users to freely modify and contribute to its development. This fosters a community-driven approach and often leads to rapid improvements and feature additions.
  • Multi-Platform Support
    KOReader supports a wide range of devices including Kindle, Kobo, PocketBook, and Android devices, making it a versatile option for users across different e-readers.
  • Customizability
    The application offers extensive customization options for font styles, page layout, and other reading parameters, enabling users to tailor their reading experience to their preferences.
  • File Format Compatibility
    KOReader supports a variety of eBook formats such as EPUB, PDF, MOBI, and DJVU, providing flexibility and reducing the need for format conversion.
  • Active Development
    The app benefits from continual updates and community support, ensuring that bugs are frequently addressed and new features are regularly introduced.

Possible disadvantages of KOReader

  • Complex Installation
    For non-technical users, installing KOReader can be challenging, especially on some e-reader devices that require specific steps or jailbreaking.
  • User Interface
    The user interface can be less intuitive compared to some proprietary e-reader software, which might be a hurdle for some users accustomed to more polished UIs.
  • Battery Consumption
    KOReader is known to consume more battery compared to native reading applications on some devices, which can be a disadvantage for users needing long battery life.
  • Performance Issues
    Users may experience occasional performance issues, such as slower page turns or lag, particularly with large or complex documents.
  • Limited Official Support
    As an open-source project, KOReader lacks formal customer support. Users rely on community forums and documentation for troubleshooting and support.

Document Viewer features and specs

  • Open-Source
    Being open-source allows for transparency and community contributions, facilitating improvements and customization.
  • Privacy-Focused
    The app is designed with user privacy in mind, avoiding unnecessary data collection and permissions.
  • Multi-Format Support
    Supports various document formats including PDF, EPUB, XPS, DJVU, FB2, and comic books.
  • Offline Functionality
    The app can be used offline, which is a great advantage for users with limited or no internet access.
  • Active Maintenance
    Regular updates and active maintenance ensure that the app stays current with new features and bug fixes.

Possible disadvantages of Document Viewer

  • User Interface
    The UI might not be as polished or intuitive as some proprietary apps, potentially making it harder to use for some users.
  • Limited Advanced Features
    While it covers basic needs well, it may lack some advanced features found in more commercial alternatives.
  • Compatibility Issues
    There might be occasional compatibility issues with certain document formats or newer devices.
  • Resource Intensive
    On lower-end devices, the app might consume more resources, affecting performance and responsiveness.
  • Community Reliance
    As it is community-driven, the speed of addressing bugs or adding new features might depend on community contributions.

Analysis of KOReader

Overall verdict

  • KOReader is generally considered a good e-reader application.

Why this product is good

  • KOReader is praised for its versatility and customization options. It supports a wide range of e-book formats, works on multiple devices (including Kindle, Kobo, and PocketBook), and offers features like dictionary support, text-to-speech, and extensive settings for font, layout, and reading preferences.

Recommended for

  • Users who need cross-platform compatibility across different e-reading devices.
  • Readers who require support for various file formats like EPUB, MOBI, PDF, DJVU, and more.
  • Those who appreciate extensive customization options in their reading experience.
  • Tech-savvy users who enjoy open-source projects and community-driven development.

Analysis of Document Viewer

Overall verdict

  • Yes, Document Viewer is generally regarded as good, especially for those looking for a simple and efficient tool to view a variety of document types.

Why this product is good

  • Document Viewer on GitHub is often considered a good tool due to its open-source nature, allowing for community contributions and adaptability to various needs. It is typically lightweight, which makes it suitable for quick document viewing without the need for heavier applications. Additionally, it supports multiple formats, making it versatile for different types of document users.

Recommended for

    It is recommended for developers who prefer open-source software, users seeking a lightweight and flexible document viewing solution, and anyone who needs to handle multiple document formats efficiently without the overhead of larger software suites.

KOReader videos

Kobo Aura One KOReader PDF Review

More videos:

  • Review - Kobo Aura ONE PDF reader vs. KOReader reflow

Document Viewer videos

No Document Viewer videos yet. You could help us improve this page by suggesting one.

Add video

Category Popularity

0-100% (relative to KOReader and Document Viewer)
eBook Reader
78 78%
22% 22
Ebooks
76 76%
24% 24
PDF Tools
0 0%
100% 100
eBook Manager
100 100%
0% 0

User comments

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Social recommendations and mentions

Based on our record, KOReader seems to be more popular. It has been mentiond 105 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

KOReader mentions (105)

  • Mozilla shutdown Pocket on July 8, 2025
    I use KOReader [1] on my Kobo. It supports Wallabag [2]. Wallabag offers both hosted [3] and self-hosted options. There's also a standalone kobo client for Wallabag [4]. In addition, Wallabag also supports direct import from Pocket. [1] https://koreader.rocks/ [2] https://wallabag.org/ [3] https://www.wallabag.it/en [4] https://gitlab.com/anarcat/wallabako. - Source: Hacker News / 20 days ago
  • All Kindles can now be jailbroken
    Highlighting the very popular app enabled by this, KOReader: https://koreader.rocks/. - Source: Hacker News / 4 months ago
  • ElevenReader by ElevenLabs
    You can jailbreak you kindle [1] and install KOReader[2] and this will allow you to do this science fiction. [1] https://kindlemodding.org/jailbreaking/WinterBreak/ [2] https://koreader.rocks/. - Source: Hacker News / 4 months ago
  • Pagination widows, or, Why I'm embarrassed about my eBook
    Have you tired KOreader[0]? It supports multiple ebook formats, including epub and cbz. You'll need to jailbreak[1] your Kindle though. [0] http://koreader.rocks/. - Source: Hacker News / 7 months ago
  • PineNote Community Edition
    I love my old Kindle Touch. The #1 thing that keeps me using it is a community-maintained e-reader software you can run on it that makes it much more usable without Amazon's support: http://koreader.rocks/ My #1 priority for new hardware nowadays is making sure it's not dependent on OEM software. Nothing sucks more than buying a device for a selected purpose, and then not being able to use it fully because some... - Source: Hacker News / 8 months ago
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Document Viewer mentions (0)

We have not tracked any mentions of Document Viewer yet. Tracking of Document Viewer recommendations started around Mar 2021.

What are some alternatives?

When comparing KOReader and Document Viewer, you can also consider the following products

calibre - Ebook manager, viewer & converter

Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.

FBReader - FBReader is an e-book reader for various platforms. Features:

Librera Reader - Librera Reader for Android

Okular - Okular is a universal document viewer based developed by KDE.

ReadEra - Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats.