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Opal.so VS Cool Reader

Compare Opal.so VS Cool Reader and see what are their differences

Opal.so

Real Focus in Real-Time. Measure and improve your focus day by day, on iPhone, iPad and macOS.

No screenshot yet
Rating
0 reviews
Alternatives Is it good?
Cool Reader

Fast and small cross-platform eBook reader for desktops and handheld devices

Rating
0 reviews
Alternatives Is it good?
Monitask
Employee Monitoring Software with Screenshots, Internet, Activity and Time Tracking sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, Cool Reader seems to be more popular. It has been mentioned 2 times since March 2021.

social mentions
0 vs 2
Productivity popularity
100% vs 0%
alternatives listed
137 vs 101

Base details

Website, pricing, platforms and company facts side by side.

Opal.so
Cool Reader
Website opal.so sourceforge.net
Pricing
Official pricing
—
Listed in
Focus Productivity Time Tracking Time Management +1
eBook Reader Ebooks eBook Manager Books & Reference +1

Features and specs

What each product offers, as listed by its team.

Opal.so 0 features
Cool Reader 5 features

No features have been listed yet.

  • 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    The user interface may feel outdated compared to modern eBook readers, lacking some of the sleek and intuitive design elements.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.

Videos

Walkthroughs and reviews on video.

Opal.so 0 videos + Add
Cool Reader 3 videos + Add

No Opal.so videos yet. You could help us improve this page by suggesting one.

Review Cool Reader

More videos

  • - Cool Reader (by Vadim Lopatin) - book reading app for Android.
  • - Cool Reader - Лучшая читалка на Android ( Review)

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Opal.so
Cool Reader
100% 100%
Productivity
0% 0%
0% 0%
eBook Reader
100% 100%
100% 100%
Focus
0% 0%
0% 0%
Ebooks
100% 100%

User comments

Share your experience with using Opal.so and Cool Reader. For example, how are they different and which one is better?

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Opal.so 0 mentions
Cool Reader 2 mentions

Tracking Opal.so since May 2025.

  • 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

Alternatives to Opal.so and Cool Reader

When comparing Opal.so and Cool Reader, you can also consider the following products.

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