Unparalleled suite of productivity-boosting Web APIs & cloud-based micro-service applications for developers and companies of any size.


Top 10 API Testing Tools in 2023

APIs form the building blocks of large systems today. APIs are preferred for systems to communicate with each other and exchange data. Have you ever wondered if these APIs are working correctly while meeting the data needs of the systems?

Certain tests must be performed before the APIs produced or consumed are released into the production environment. API testing has become important with the rise of cloud applications and interconnected platforms. Many of the services we use every day depend on various interconnected APIs, and if one of them does not work as expected, at that point the entire service can be compromised.

From this article, we will list Top 10 API testing tools.



Postman offers a desktop application and a web application for testing API services. It allows the user to easily share information with the team.

The Postman API Development Environment is divided into three sections: Collections, Workspaces, and Built-in Tools. The Postman collections section allows you to run, test and troubleshoot requests, run automated tests, archive and view API.

The Postman workspace gives you the collaboration feature. It lets you share collections, set permissions, and control participation in different workspaces for any team size. It is very simple to use and supports GraphQL.

For more information: https://www.postman.com/



Katalon is a free API testing tool for Web, Mobile and Desktop applications. It offers simple development options by collecting all systems and modules in a single package.

Katalon Studio offers easy and fast deployment by including all systems, ALM integrations and modules in one package.

Katalon also supports REST and SOAP requests and offers a wealth of parameterization commands and features. In addition, Katalon takes a knowledge-driven approach, supports CI/CD tools and allows testers to run automated and exploratory testing.

For more information: https://katalon.com/



TestGrid API Testing Tool is a web-based API testing tool with an easy-to-use interface that is 70% faster than traditional API testing methods to help you test faster and deliver faster.

TestGrid runs automated tests in a continuous pipeline to provide faster feedback to your development teams while reducing troubleshooting and resolution time.

It supports REST and SOAP web services.

For more information: https://www.testgrid.io/


Copado’s API test automation supports the consistent development of test frameworks in an adaptive way.

IT teams of all sizes use Copado to accelerate their testing by automating critical lifecycle parts such as test configuration, planning, test creation and execution. Copado enables customers to save a significant cost in maintenance and change efforts in testing to address one of the key business issues.

Copado makes this possible with an AI-controlled hub to bring self-healing automation, among other special capabilities. User experience and design are at the heart of Copado’s approach to consistent innovation in a relentless effort to accelerate testing and improve delivery quality for customers.

For more information: https://www.copado.com/



Rest Assured was released in December 2010 to test REST requests, perform API-level tests and manage many HTTP operations.

It offers the opportunity to write API tests in Rest assured Gherkin format. Thus, it provides ease of writing and reading, creating projects that comply with the standards in object-oriented programming, and doing a lot of work with less code with its chain method structure.

For more information: https://rest-assured.io/ 



SOAP UI is an open source web service testing tool. Through SOAP UI, operations such as API test, Load Test, Security Test can be performed.

Based on its name, it is possible with SOAP UI to test not only SOAP web services but also REST APIs.

For more information: https://www.soapui.org/


Advanced REST Client

Advanced REST Client is a simple open source API testing tool. You can use it as a Chrome extension or download and install a desktop version.

When you install the Chrome extension, it automatically installs a virtual desktop application that is not installed directly on your computer.

You can view the response time, but the app doesn’t include GraphQL testing yet.

For more information: https://docs.advancedrestclient.com/



ReadyAPI is a good option for security and load testing of RESTful, SOAP, GraphQL and other web services.

It provides automation options to integrate API testing into your CI/CD layout during each build. You will be able to create comprehensive and data-driven functional API tests.

For more information: https://smartbear.com/product/ready-api/overview/


Tricentis Tosca

Tricentis Tosca was released as a software testing tool that supports HTTP , AMQP, SOAP and many other protocols.

It provides the functionality of test cases to ensure an effective test management process.

For more information: https://www.tricentis.com/



Assertible provides easy, reliable and fast API testing and performance monitoring. It constantly tests web services and emphasizes automation and reliability.

It helps reduce the number of false positives in your automated QA tests and ensure that your APIs are working properly.

For more information: https://assertible.com/



It is very important to test APIs, which are frequently used in API development processes and are the most effective way of data transport. You can check the API testing tools in this article and make sure that your APIs are working properly.

Related posts

The Best Free APIs to Use in 2024 for Your Business


App Store Search API: How To Optimize Your App's Visibility


What is an API? Understanding All the Key Factors


How To Rewrite And Enhance Any Article Using Paraphraser AI

Leave a Reply

Your email address will not be published. Required fields are marked *