Cool Reader VS FacetShelf

• Open Source
  Cool Reader is an open-source software, which means it is free to use and has the potential for community-driven improvements and customizations.
• Format Support
  The software supports a wide range of eBook formats including EPUB, FB2, TXT, RTF, HTML, and MOBI, making it versatile for different reading needs.
• Customization
  Cool Reader offers extensive customization options, allowing users to adjust font sizes, styles, line spacing, and backgrounds to suit their reading preferences.
• Cross-Platform
  It is available on multiple platforms, including Windows, Linux, and Android, providing flexibility for users to read on different devices.
• Lightweight and Fast
  The software is lightweight and optimized for performance, ensuring quick loading times and smooth operation even on older hardware.

Possible disadvantages

• User Interface
  The user interface may feel outdated compared to modern eBook readers, lacking some of the sleek and intuitive design elements.
• Feature Set
  While it supports basic functionality, Cool Reader may not have some of the advanced features found in commercial eBook readers, such as integrated dictionaries or syncing across devices.
• Technical Knowledge
  Being open-source, it might require a bit more technical knowledge to set up and configure compared to more polished, commercial products.
• Limited Support
  Since it is a community-driven project, users might encounter limited official support and may have to rely on forums or community help for troubleshooting.
• Updates
  The frequency and reliability of updates can be inconsistent, which might lead to compatibility issues with newer file formats or operating system versions.

• Format Support
  Five formats (EPUB / MOBI / AZW3 / PDF / TXT) in one reader
• Translation
  Whole-book translation that follows your reading; dual bilingual view; translations cached per line, permanently
• AI Chat
  Ask the book: answers with citations that jump back to the original passage
• Offline Reading
  Reading position synced across devices; offline reading
• API Access
  Open beta, free while in beta; bring your own API key

Review Cool Reader

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• Recommended E-reader? [more in comments]

  An Android tablet and the CoolReader app. For me, it's simply the best eReader experience available. It's incredibly customisable. The only downside is it doesn't support PDF or AZW3, both of which can be reformatted to your preferred... Source: almost 4 years ago

• E-Reader for Windows 10

  Cool reader is also another option https://sourceforge.net/projects/crengine/. Source: over 5 years ago

Tracking FacetShelf since Oct 2026.