Top 5 Functional Testing Tools to Use for Automation in 2023

Functional Testing Tools list

The automation of functional testing is a trend in the software testing industry that is expected to increase in significance in the next years.

In the ever-evolving world of software testing, functional testing plays a crucial role in ensuring the quality and reliability of software applications. It helps to verify that the software is working as intended and meets the needs of the end users.

Automation of functional testing has gained popularity in recent years. Automating functional testing involves using software tools to execute predefined test scripts automatically, instead of manually executing them. This not only saves time and effort but also helps to improve the quality of the software by identifying issues early on. Moreover, automated testing can lower the possibility of errors caused by human intervention, which can be a major factor leading to issues in software testing.

Automated functional testing will become more important to guarantee that software satisfies end-users needs and functions as intended, as software development becomes more complex, and the demand for high-quality software grows.

1. Selenium


Selenium is one of the most popular functional testing tools available today. It is a portable software testing framework for web applications. 

Selenium supports various programming languages such as Java, C#, Python, and Ruby. It provides a range of features such as recording and playback, test script creation, and integration with various test frameworks.

Selenium also supports multiple browsers such as Chrome, Firefox, and Internet Explorer. It has a vast community of users, which means there are a lot of resources available online to help users with any issues they may face.


• Cross-browser compatibility – Selenium supports various browsers like Chrome, Firefox, Safari, Internet Explorer, and more, making it highly compatible for testing different web applications. 

• Multi-language support – Selenium supports multiple programming languages such as Java, Python, C#, Ruby, and more, making it flexible for testers to write scripts in their preferred language. 

• Easy integration with other tools – Selenium can be easily integrated with other tools like TestNG, JUnit, Maven, and more, making it highly adaptable for different testing environments. 

• Test case management– Katalon Studio enables users to manage their test cases and test suites, execute them, and view the results.


Selenium is widely popular among developers and testers due to its flexibility, ease of use, and cost-effectiveness. 


Selenium has some limitations as a functional testing tool. Such as it cannot automate desktop applications or mobile applications, and it does not provide support for image-based testing. 


Selenium is an open-source tool and is free to use, making it cost-effective for organizations. This is one of the reasons why it is so popular.

Official Website

2. TestNG

testng logo

TestNG (Test Next Generation) is a popular testing framework for Java applications. It provides a wide range of features and functionalities to facilitate efficient and comprehensive testing. TestNG is designed to enhance and supplement the capabilities of the traditional JUnit framework.

TestNG is widely adopted and has a strong community with extensive documentation, tutorials, and resources available. It offers a powerful and feature-rich testing framework that enables developers and testers to create robust and efficient test suites for Java applications.


  • Parallel Test Execution: TestNG allows tests to be executed in parallel, which can significantly reduce test execution time. You can configure parallelism at various levels, such as test method level, test class level, or suite level. 
  • Test Prioritization: TestNG enables you to prioritize tests, ensuring that critical tests are executed first. This helps in identifying and resolving issues quickly. 
  • Support for Multiple Frameworks: TestNG can be used alongside other testing frameworks like JUnit, allowing you to leverage existing test code and gradually migrate to TestNG. It provides a JUnit compatibility mode for running JUnit tests using TestNG.
  • Test Configuration: TestNG allows you to configure test suites, test groups, and test dependencies using XML configuration files. This provides flexibility in defining test execution and allows for easy customization. 
  • Test Dependencies: TestNG supports test dependencies, allowing you to define the order in which tests should be executed. This is useful when a test depends on the successful execution of another test. 
  • Reporting: TestNG provides detailed test reports in HTML format, which include information about test results, execution times, and logs. These reports help in analyzing test outcomes and identifying failures. 


TestNG is primarily designed for Java applications. It is compatible with different Java development environments such as Eclipse, IntelliJ IDEA, and NetBeans. It also works well with various systems and can be seamlessly integrated into your Java projects.


  •  Not beginner friendly: TestNG may have a steeper learning curve compared to simpler testing frameworks like JUnit, especially for beginners. 
  • Limited Language Support: TestNG is primarily focused on Java applications and may not provide the same level of support or integration for other programming languages. 
  • Limited Non-Java Features: While TestNG offers advanced features for testing Java applications, it may have limited capabilities when it comes to testing non-Java components such as web services, databases, or user interfaces. 
  • Despite these limitations, TestNG’s extensive features and compatibility with Java make it a popular choice for testing Java applications.


TestNG is an open-source framework and is available for free. 

Official Website

Link to the official TestNG website:

3. Cypress

cypress logo

Cypress is a modern open-source automation testing tool for web applications. It offers features such as real-time reloads, debugging, and integration with various tools like CircleCI and Jenkins. Cypress also supports several programming languages such as JavaScript and TypeScript.


• Easy installation– Cypress is easy to install and use, with minimal setup required to get started.

• Integration with popular testing frameworks– Cypress integrates easily with popular testing frameworks like Mocha and Jest, making it easy to get started with testing in Cypress.

• Automatic Waiting–  Cypress automatically waits for elements to appear on the page, and for commands and assertions to complete before moving on to the next step in the test.

• Screenshots and videos– Cypress captures screenshots and videos of your tests, making it easy to visually inspect the behavior of your code.

• Cross-browser testing– Cypress supports testing in multiple browsers, making it easy to ensure your code works on different platforms.

Want to Master UI & API Testing with Cypress in 48 Hours! Join our intensive 2-day workshop to unlock the full potential of Cypress testing.


• Supports testing on modern web browsers such as Chrome, Firefox, Edge, and Safari.

• Works on Windows, macOS, and Linux operating systems.

• Can be integrated with popular Continuous Integration (CI) tools like Jenkins.


• Cypress has gained popularity among testers due to its ease of use and powerful features.

• It has a large and active community that contributes to its development and provides support to users.

• According to the State of JavaScript survey, Cypress is the third most popular testing framework as of 2020.


• Cypress supports only JavaScript, so users need to have knowledge of JavaScript to use it effectively.

• Cypress cannot test native mobile applications.


Cypress is free and open-source software.

Official Website

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4. Appium

Appium Logo
Image from:

Appium is an open-source automation tool for mobile applications. It supports both Android and iOS platforms, allowing users to test mobile apps on real devices, emulators, or simulators. Appium supports various programming languages such as Java, C#, Ruby, Python, and JavaScript.

Appium offers features such as record and playback, integration with various test frameworks, and parallel test execution. It also supports the automation of hybrid and native mobile apps. Appium has a large and active community, making it easy to find resources and support.


Multiple programming language support– Appium supports a wide range of programming languages, including Java, Python, Ruby, JavaScript, and many more. This makes it easy for users to write tests using their preferred language.

Integration with testing frameworks– Appium can be integrated with popular testing frameworks such as JUnit, TestNG, and Mocha, making it easy for users to write and run tests using these frameworks.

Cross-platform support– Appium supports automation for both Android and iOS platforms, making it easy to write automated tests for their mobile applications.

Support for cloud testing– Appium supports cloud testing services such as Sauce Labs and BrowserStack, which allows testers to run their tests on multiple devices and platforms in parallel.


Appium supports a wide range of programming languages including Java, Python, Ruby, JavaScript, and many more. It also supports a variety of testing frameworks such as JUnit, TestNG, RSpec, Mocha, and many others. Appium can be used on both macOS and Windows platforms.


Appium is a popular mobile automation framework, and its popularity has been growing rapidly over the years. It has a large and active community of developers who contribute to its development and provide support to other users.


One of the main limitations of Appium is that it requires a certain level of technical expertise to set up and use effectively. Additionally, Appium can be slow and resource-intensive when compared to other mobile automation tools.


Appium is an open-source framework and is available for free.

Official Website

Learning Resource: Check the Appium Course to learn it from Scratch.

5. Playwright

Playwright Logo
Image from Playwright:

Playwright is an open-source automation library that enables to automate the testing of web applications across different browsers and platforms. Playwright aims to be fast, reliable, and capable of running in various environments, including CI/CD pipelines, local development environments, and cloud services.

It provides a high-level API for browser automation and supports programming languages such as JavaScript, TypeScript, Python, and C#.

Playwright is built by Microsoft and was first released in 2019. It has gained popularity among testers for its ease of use, cross-browser compatibility, and powerful features. Playwright is widely used for web scraping, testing, and building automation tools for web applications.


• Cross-browser support– Playwright supports three major web browsers – Chromium, Firefox, and WebKit, which means you can write tests once and run them across multiple browsers.

• Multiple programming languages– Playwright supports several programming languages, including JavaScript, TypeScript, Python, and Java, making it accessible to a wide range of users.

• Video recording– Playwright can record videos of test runs, which can be helpful for debugging and sharing test results.

• Mobile emulation– Playwright allows you to emulate mobile devices and test your web application’s responsiveness across a range of devices.


Playwright is compatible with major operating systems like Windows, macOS, and Linux. It also supports major programming languages including JavaScript, TypeScript, Python, and Java.


Playwright has gained popularity due to its ease of use, cross-browser support, and advanced features such as video recording, network interception, and mobile emulation. It has a growing community of contributors and users.


One limitation of Playwright is that it requires a certain level of technical proficiency and knowledge of programming to use effectively. Additionally, it may not work with certain websites or applications due to security measures.


Playwright is completely free and open-source. There are no licensing fees or hidden costs associated with using it.

Official Website


Tool / FeatureSeleniumCypressPlaywrightTestNGAppium
UsageWeb automationWeb automationWeb automationJava applications, used for unit testing, integration testing, and functional testingMobile automation
Language SupportJava, C#, Python, Ruby, JavaScript, PHPJavaScriptPython, JavaScript, TypeScriptJavaJava, Ruby, Python, JavaScript, PHP, C#, Objective-C, and Swift
Cross-browser testingYesYesYesCan be integrated with tools for cross-browser testingYes
Support for multiple frameworksYesNoNoYesYes
PricingOpen sourceOpen sourceOpen sourceOpen sourceOpen source
Integration with CI/CD toolsYesYesYesYesYes
Parallel testingYesYesYesYesYes

Written by

Naz is a QA Engineer in a high-paced and quality obsessed environment. Passionate about new technologies and techniques in testing. Regularly attends test events and meetings. 
Currently working as a Software QA Engineer at Emakina.TR / EPAM Systems. LinkedIn:
2 thoughts on “Top 5 Functional Testing Tools to Use for Automation in 2023
  1. Thank you for sharing the comparison chart, on playwright tool… it does support python language but I see only Java script and type script. Please update it.


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