Katalon vs Selenium

August 22, 2023

Compare Katalon and Selenium automated testing tools, and choose the best QA tool for your organization.

Compare Katalon and Selenium automated testing tools, and choose the best QA tool for your organization.

Katalon and Selenium are two widely used automation testing tools that cater to the needs of software testers and developers in ensuring the quality and functionality of their applications. While both tools are designed to automate web and mobile application testing, they possess distinct features, capabilities, and approaches that set them apart. Katalon offers a comprehensive, all-in-one solution with a user-friendly interface, allowing testers of various skill levels to create and manage automated tests efficiently. On the other hand, Selenium, an open-source framework, provides flexibility and extensibility for testers who prefer a more tailored and customizable approach to their automation scripts. Understanding the nuances of Katalon and Selenium is essential for selecting the tool that best aligns with specific project requirements, team expertise, and testing objectives. Let’s start.

What is Katalon

Katalon logo

Katalon is a versatile and user-friendly test automation tool that has gained popularity for its simplicity and comprehensive testing capabilities. 

One of Katalon's key strengths is its user-friendly interface and scriptless automation capabilities. It provides a low-code platform that allows both technical and non-technical testers to create and execute automated test cases without the need for extensive coding knowledge. This accessibility speeds up the test creation process and makes test automation more inclusive across different skill levels.

Katalon's strong community support is another standout feature. The tool has a large and active community that shares resources, knowledge, and custom solutions, fostering a collaborative environment where users can help each other overcome challenges and maximize the tool's potential.

Moreover, Katalon offers a seamless integration with popular testing frameworks like Selenium and Appium, which enables users to leverage existing Selenium scripts and libraries. This interoperability simplifies migration and makes it easier for teams already familiar with these frameworks to transition to Katalon.

What is Selenium

Selenium logo

Selenium is a widely recognized and open-source test automation framework used for automating web browsers' interactions. Selenium allows testers and developers to create automated tests that mimic user interactions with web applications, ensuring the functionality, performance, and compatibility of these applications across different browsers and platforms.

Selenium's main strength lies in its flexibility and extensibility. It supports multiple programming languages, including Java, Python, C#, and more, allowing testers to choose the language they are most comfortable with. It offers various components like Selenium WebDriver, Selenium Grid, and Selenium IDE, each catering to different aspects of automated testing.

Selenium WebDriver, the core component, enables the automation of browser interactions and provides a programmatic interface to control web browsers. Selenium Grid facilitates parallel execution of tests across multiple browsers and devices, enhancing test efficiency. Selenium IDE is a record-and-playback tool for creating basic test scripts quickly.

Selenium's open-source nature encourages a strong and active community that contributes to its continuous improvement. Its compatibility with a wide range of browsers and platforms makes it a go-to choice for cross-browser testing. However, it requires coding expertise, making it more suitable for technical testers and developers.

What are the main differences between these two?

1. Flexibility

  • Selenium: Selenium offers flexibility by supporting multiple programming languages (Java, Python, C#, etc.), catering to developers with various language preferences.
  • Katalon: Katalon also provides flexibility through scripting, but its main focus is on its user-friendly interface, making it accessible to testers with minimal coding knowledge.

2. Open Source

  • Selenium: Selenium is an open-source framework with a large and active community, resulting in continuous development and support from the community.
  • Katalon: Katalon is also open-source and benefits from community contributions, but it offers more out-of-the-box features and support resources due to its integrated environment.

3. Supported Browsers

  • Selenium: Selenium supports various web browsers (Chrome, Firefox, Edge, etc.), allowing testers to perform cross-browser testing.
  • Katalon: Katalon also supports multiple browsers, making it suitable for cross-browser testing. Additionally, Katalon offers a built-in Selenium Grid integration for parallel test execution.

4. Extensibility

  • Selenium: Selenium's extensive ecosystem allows integration with third-party libraries, frameworks, and plugins for enhanced capabilities.
  • Katalon: Katalon's ecosystem offers integrations with Selenium, Appium (for mobile testing), and a range of plugins. While less extensive than Selenium's, it provides a more streamlined experience for most testing needs.

5. Customization

  • Selenium: Selenium provides more customization options for creating and customizing test frameworks and scripts according to specific project requirements.
  • Katalon: Katalon's emphasis is on ready-to-use features, reducing the need for extensive customization. It's more suitable for testers seeking a pre-built solution.

6. Learning Curve

  • Selenium: Requires coding expertise, which can result in a steeper learning curve for non-technical testers.
  • Katalon: Offers a more gentle learning curve due to its scriptless automation and user-friendly interface, making it accessible to testers with varying technical backgrounds.

Do these software support both mobile and desktop testing?


Selenium does support both web and mobile application testing. Selenium provides two main components that cater to these different testing needs:

Selenium WebDriver for Web Testing: Selenium WebDriver is primarily used for automating web browser interactions. It supports various web browsers such as Chrome, Firefox, Safari, Edge, and more. WebDriver allows you to automate interactions with web elements like buttons, links, input fields, and more, simulating user actions on web applications.

Appium for Mobile Testing: While Selenium WebDriver is focused on web browsers, Appium is an extension of Selenium designed specifically for automating mobile application testing. Appium enables testers to automate interactions with mobile apps on devices and emulators/simulators. It supports native, hybrid, and mobile web applications across platforms like Android and iOS.


Katalon supports both web and mobile application testing. Katalon offers a comprehensive testing solution that covers various testing types, including:

Web Testing: Katalon Studio provides capabilities for web application testing. You can automate interactions with web elements, validate functionality, perform data-driven testing, and more using Katalon's built-in features. Katalon supports popular web browsers like Chrome, Firefox, and Edge, allowing you to execute tests across different browsers.

Mobile Testing: Katalon Studio also supports mobile application testing through integration with Appium. With Katalon and Appium integration, you can automate interactions with native, hybrid, and mobile web applications on both Android and iOS devices. This enables you to perform end-to-end mobile testing and ensure the quality of your mobile applications.

Localization possibility 

Both Selenium and Katalon offer opportunities for localization testing, which involves assessing the functionality and user experience of software applications in different languages, cultures, and regions. Here's how each tool supports localization testing:


 Selenium can be used for localization testing by creating automated test scripts that simulate interactions with the application's user interface. Testers can design test cases to input various languages, character sets, and regional settings to verify how the application handles different locales. Selenium's ability to interact with web elements and validate their behavior can be utilized to ensure that the application's layout, text, and functionality adapt correctly to different languages and regions.


Katalon offers features that facilitate localization testing. Testers can leverage Katalon's scripting capabilities to create test cases that validate an application's behavior under different languages, date formats, time zones, and regional settings. Katalon's data-driven testing capabilities allow testers to input localized data for validation. Additionally, Katalon's integration with various testing frameworks and tools, including Selenium and Appium, enhances its localization testing capabilities for web and mobile applications.

Do these platforms use AI or ML?

Selenium and Katalon are primarily test automation frameworks, and while they don't inherently include built-in AI (Artificial Intelligence) or ML (Machine Learning) capabilities, they can be integrated with AI and ML tools or libraries to enhance certain aspects of testing. Here's how:


Selenium itself doesn't include AI or ML features. However, testers can integrate Selenium with external AI and ML tools for tasks like data analysis, anomaly detection, or predictive analytics related to testing. For example, AI/ML models can be used to analyze test results, identify patterns, or predict potential areas of concern based on historical data.


Katalon similarly doesn't have built-in AI/ML features, but it offers integration capabilities that allow testers to incorporate AI and ML into their testing processes. For instance, Katalon can be combined with AI-driven testing platforms or libraries to enhance test generation, optimize test execution based on AI-based predictions, or automate test maintenance through machine learning algorithms.

Pricing and a free trial


Selenium is a free, open-source testing tool, so there are no licensing fees for its users.


Katalon provides three pricing plans for its complete and standalone packages: Free, Premium, and Ultimate. The Premium plan for the standalone package which includes a single product within Katalon portfolio starts at $167/ month for just 1 member writing test scripts while the Ultimate plan’s pricing is custom. Both packages are available for a 30-day trial and a 30% discount for the Starter Plan. 

Customer Support, training and education


Selenium offers customer support through its extensive open-source community, where users can seek help through forums, discussion boards, and online resources. The availability of resources greatly depends on community participation, making it variable in terms of response time and depth of assistance. Selenium's official documentation is comprehensive but might require a certain level of technical expertise to navigate effectively. While Selenium doesn't provide formal training or education directly, there are numerous online courses, tutorials, and guides available from third-party providers, catering to a wide range of skill levels.


Katalon takes a more structured approach to customer support, providing both free and paid support plans, which include access to their support ticket system. Paid plans offer faster response times and priority assistance. Katalon's official documentation is thorough and organized, making it user-friendly for testers of all levels. Additionally, Katalon offers comprehensive training materials, including webinars, video tutorials, documentation, and certification programs. These resources contribute to a smoother onboarding experience, ensuring that users can quickly harness Katalon's features for their test automation needs.

About the author

author photo: Tamas Cser

Tamas Cser


Tamas Cser is the founder, CTO, and Chief Evangelist at Functionize, the leading provider of AI-powered test automation. With over 15 years in the software industry, he launched Functionize after experiencing the painstaking bottlenecks with software testing at his previous consulting company. Tamas is a former child violin prodigy turned AI-powered software testing guru. He grew up under a communist regime in Hungary, and after studying the violin at the University for Music and Performing Arts in Vienna, toured the world playing violin. He was bitten by the tech bug and decided to shift his talents to coding, eventually starting a consulting company before Functionize. Tamas and his family live in the San Francisco Bay Area.

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