Best API Testing Tools for Windows of 2025

Software for continuous performance testing to automate API load and application testing. For complex applications, you can design code-free performance tests. Script performance tests in automated pipelines for API test. You can design, maintain, and run performance tests in code. Then analyze the results within continuous integration pipelines with pre-packaged plugins for CI/CD tools or the NeoLoad API. You can quickly create test scripts for large, complex applications with a graphical user interface. This allows you to skip the tedious task of manually coding new or updated tests. SLAs can be defined based on the built-in monitoring metrics. To determine the app's performance, put pressure on it and compare SLAs with server-level statistics. Automate pass/fail triggers using SLAs. Contributes to root cause analysis. Automatic test script updates make it easier to update test scripts. For easy maintenance, update only the affected part of the test and re-use any remaining.

Accelerate the development of APIs that are ready for production. AI-Powered Code Generating, Mocking within Minutes and On-Demand Ephemeral Testing Environments. With Blackbird's proprietary technology and simple, intuitive tools, you can Spec, Mock and Write Boilerplate code faster. Validate your specs, run tests on a live environment and debug in Blackbird with your team. This will allow you to deploy your API with confidence. You can control your own test environment, whether it's on your local machine, or in the dedicated Blackbird Dev Environment. This is always available to you in your Blackbird account and there are no cloud costs. OpenAPI standardized specs are created in seconds, so you can begin coding without spending time on your design. Mocking that is dynamic, sharable and easy to share in minutes. No need to manually write code or maintain it. Validate and go.

Parasoft's mission is to provide automated testing solutions and expertise that empower organizations to expedite delivery of safe and reliable software. A powerful unified C and C++ test automation solution for static analysis, unit testing and structural code coverage, Parasoft C/C++test helps satisfy compliance with industry functional safety and security requirements for embedded software systems.

Testsigma is a low-code end-to-end test automation platform for Agile teams. It lets SDETs, manual testers, SMEs, and QAs collaboratively plan, develop, execute, analyze, debug, and report on their automated testing for websites, native Android and iOS apps, and APIs. It is available as a fully managed, cloud-based solution as well as a self-hosted instance that is open source (Testsigma Community Edition). The platform is built with Java, but the automated tests are code-agnostic. Through built-in NLP Grammar, teams can automate user actions in simple English, or generate airtight test scripts with the Test Recorder. With features like built-in visual testing, parametrized or data-driven testing, 2FA testing, and an AI that automatically fixes unstable elements and test steps, identifies and isolates regression-affected scripts, and provides suggestions to help you find and fix test failures, Testsigma can replace tens of different tools in the QA toolchain to enable teams to test easily, continuously, and collaboratively.

Postman serves as a collaborative platform for developing APIs, designed to simplify the entire process of API creation and enhance teamwork, enabling the rapid development of superior APIs. The platform's features facilitate each phase of API construction, making it easier to collaborate and accelerate the creation of high-quality APIs. Users can quickly and effortlessly send requests for REST, SOAP, and GraphQL directly within Postman, optimizing their workflow. Additionally, it allows for the automation of manual tests, seamlessly integrating them into your CI/CD pipeline to safeguard against potential issues when code changes are deployed to production. API behavior can be communicated effectively by simulating endpoints and their respective responses without the need for a backend server setup. You can also generate and publish visually appealing, machine-readable documentation, which helps in making your API more accessible for users. Regular performance and response time checks ensure you stay informed about your API's health, allowing for proactive management. Lastly, Postman fosters a shared environment for API creation and consumption, enabling real-time collaboration among team members.

Cerberus Testing automates continuous testing at scale with low-code software. The solution will eliminate the need to implement an internal testing framework for years. The product allows you to iterate quickly through your testing lifecycle: from test repository, execution, and reporting. The solution allows teams to collaborate from the use-cases creation to the execution of test cases on a variety of browsers and devices. To execute your test at scale, you can use your own or external robots infrastructure. This allows you to concentrate on your business value. It supports many integrations to speed up implementation, such as Bitbucket and Slack. It is open-source and maintained by many digital and retail players, including La Redoute and Decathlon, Adeo and Norauto.

QATTS stands out as the industry's most all-encompassing provider of cloud-based test automation solutions from start to finish. We guarantee the exceptional quality of your software applications and products through our customizable and ready-to-use automation testing offerings. Our team consists of experienced QA analysts, automation test engineers, and other IT specialists who collaborate closely to ensure timely delivery of dependable services and immediate results. With expertise in both manual and automated testing, our QA professionals are skilled in utilizing the latest web, desktop, and mobile technologies, along with a variety of testing tools. Our in-depth understanding of automation trends has established us as the ultimate destination for all your test automation requirements, including RESTful and SOAP-based web services, as well as IBM, Attachmate, and Hummingbird emulators. We are committed to continuously evolving our services to meet the ever-changing demands of the industry and our clients.

SoapUI testing tools, available in both open source and commercial versions, simplify the process of creating, managing, and executing comprehensive tests for REST, SOAP, GraphQL APIs, JMS, JDBC, and various web services, allowing for quicker software delivery. For those in development and testing roles eager to enhance their capabilities in delivering REST and SOAP APIs, SoapUI Open Source serves as the most straightforward and user-friendly starting point for API testing. With the next-generation tool designed for streamlining validation of REST, SOAP, GraphQL, microservices, and other backend services, teams can seamlessly integrate API testing into their continuous delivery pipelines. As the backbone of modern software development, APIs, or Application Programming Interfaces, facilitate the connection and transfer of data and logic between different systems and applications. Effective testing of these APIs can significantly enhance the overall efficiency of your testing strategy, enabling even faster software delivery while ensuring higher quality outputs. This ensures that teams remain competitive in a rapidly evolving tech landscape.

T-Plan's Cross-Platform Test Automation Software can run the same tests across different devices, and platforms. T-Plan Robot is a highly flexible, easy to use, image-based black box GUI automation tool that creates robust automated scripts and exercises applications in the same way as would an end-user. T-Plan Robot is platform-independent (Java) and runs on, and automates all major systems such as Windows, Mac, Linux and Unix plus mobile platforms. We have a solution for any environment. Our virtual workforce solution is application and environment agnostic. Our Java Robot uses a human-like GUI level interaction, using the typical application front-end. Non-intrusive, and a no-code low code approach. Our RPA uses the same scripts, to automate any environment, meaning that automation can occur on Windows, Mac and Linux using the same automation development. T-Plan Robot is the only RPA tool on the market which supports Mac and Linux and Windows in the same application. Robot is the most flexible test automation tool on the market, with identical scripting support for Mac, Windows, Linux & Mobile.

Utilize Telerik Fiddler HTTP(S) proxy to capture all internet traffic between your computer and external sites, allowing you to analyze that traffic, set breakpoints, and manipulate both requests and responses. Fiddler Everywhere serves as a versatile web debugging proxy compatible with macOS, Windows, and Linux platforms. You can capture, inspect, and monitor all HTTP(S) communication, facilitating the mocking of requests and troubleshooting of network problems. This tool is applicable to any browser or application, enabling you to debug traffic across macOS, Windows, Linux, and mobile devices running iOS or Android. It guarantees that the necessary cookies, headers, and cache settings are properly exchanged between client and server. Supporting diverse frameworks such as .NET, Java, and Ruby, Fiddler Everywhere empowers you to mock or alter requests and responses on any website efficiently. This straightforward approach allows for testing website functionality without the need for code alterations. By employing Fiddler Everywhere, you can effectively log and analyze all HTTP/S traffic between your system and the wider internet, streamlining your debugging process.

TAST, Test Automation System tool is a cloud-based framework that allows businesses to optimize their test automation from the End User's perspective. It is simple to use, and the graphical interface allows you to define automated test cases across all technological platforms. TAST automates: *Cross Browser testing *Mobile testing *DDBB testing: Oracle, PostgreSQL, MySQL, Db2. *File testing: txt, pdf, word, excel, csv, xml. *Mainframe testing: AS400. Host *API testing *Interface testing. *Remote Server testing. Types of tests that you can automate using TAST: *Integration *Functional *System: Regressive, stress, load, parallel *Acceptance *A/B.

ZAPTEST is a leading Free and Enterprise software test automation and RPA tool. Computer Vision technology allows cross-platform digital interface automation for UI and API. This combined with our 1SCRIPT methodology, seamless automation, parallel execution, and unlimited licenses, will result in a testing suite that generates up to 10X ROI. ZAPTEST will automate any procedure you can do via any digital interface (live app or mockup). Discover the unparalleled advantages of partnering with ZAPTEST Our partners are essential in providing businesses with innovative, industry-leading automation solutions that transform software testing and RPA processes. ZAPTEST empowers organizations with a unified automation platform that streamlines both software testing and business operations. Our unlimited licensing model ensures you can scale effortlessly, transforming your business into an agile, efficient powerhouse.

Ambassador Edge Stack, a Kubernetes-native API Gateway, provides simplicity, security, and scalability for some of the largest Kubernetes infrastructures in the world. Ambassador Edge Stack makes it easy to secure microservices with a complete set of security functionality including automatic TLS, authentication and rate limiting. WAF integration is also available. Fine-grained access control is also possible. The API Gateway is a Kubernetes-based ingress controller that supports a wide range of protocols, including gRPC, gRPC Web, TLS termination, and traffic management controls to ensure resource availability.

Alithya GoTest is a collaborative test hub that is easy and quick to master and integrate, ensuring the quality of any professional digital solutions for companies requiring reliability without compromises. Through the GUI, our solution allows you to collaborate, execute and fix your tests and communicate at all levels to ensure test plans and test results are provided with the right level of details. Alithya GoTest is platform-agnostic and will allow you to seamlessly test desktop, web and mobile applications. You will not have to spend months building, maintaining and integrating your test platform into your development workflow, which allows your development team to focus on delivering value and quality. Compared to more traditional solutions, Alithya GoTest is the only tool on the market that allows you to completely test your software from end-to-end using continuous testing in a DevOps process. Contact our top-notch bilingual support team or use our consulting, coaching or online training resources to get up to speed in no time. Benefit from our growing list of pre-made test suites for professional ERP platforms like Oracle Fusion Cloud to ensure updates are not breaking your software solution.

Automated Continuous Testing without the need for coding is made possible with Tricentis Tosca, recognized as the leading platform in this domain, which enhances the testing process through its script-free, no-code methodology for comprehensive test automation. Supporting a vast range of over 160 technologies and enterprise applications, Tosca ensures robust test automation suited for various use cases. Discover the advantages of Tricentis Tosca, which include: - Rapid feedback mechanisms tailored for Agile and DevOps environments - Significant reduction in regression testing durations to mere minutes - Enhanced reusability and maintenance of test assets - Clear visibility into potential business risks - Seamless integration and extension of existing testing resources such as HPE UFT, Selenium, and SoapUI, among others. By leveraging these capabilities, organizations can streamline their testing processes and improve overall quality assurance.

HttpMaster is a HTTP debugging and testing tool specialized in testing web API applications and REST web services. Core features: - HttpMaster project to store complete definition of request items. - Broad set of HTTP properties (HTTP headers, URL encoding, etc.). - Dynamic parameters to simulate variations of input data or create global API values. - Response data validation with logical expressions. - Request chaining to use data from previous request with the next request. - Extensive data upload support, including 'multipart/form-data'. - Request data builder for creating request body with an optional parameters. - Request item execution with detailed progress monitoring. - Execution groups to create batches of requests. - Comprehensive execution data review and management. - Basic request tool for ad-hoc execution. - Command line interface. - Support for PDF reports. - Support for cURL commands.

Test functional, performance, and security aspects of APIs. Provides Pass/Fail criteria rules to enable regression testing of API behavior. Tests can be run on-demand or automated from the command-line. Supports latest OpenAPI standards for parsing OpenAPI documents and building test cases for the defined operations. Authentication schemes including SAML, OAuth, Basic Auth, Amazon Auth, PKI, and Kerberos. Create behavior baselines and run regression tests to determine breakage or change of behavior. Includes JSON and XML Diff capability. Generate performance load across multiple virtual clients to measure and validate the performance criteria of the target APIs. Security and identity are processed for each request to ensure real world simulated inputs and not replays. Built-in support for AWSv4 signatures enables authentication to test Amazon AWS APIs.

You can use your favorite debugging software to locally troubleshoot your Kubernetes services. Telepresence, an open-source tool, allows you to run one service locally and connect it to a remote Kubernetes cluster. Telepresence was initially developed by Ambassador Labs, which creates open-source development tools for Kubernetes such as Ambassador and Forge. We welcome all contributions from the community. You can help us by submitting an issue, pull request or reporting a bug. Join our active Slack group to ask questions or inquire about paid support plans. Telepresence is currently under active development. Register to receive updates and announcements. You can quickly debug locally without waiting for a container to be built/push/deployed. Ability to use their favorite local tools such as debugger, IDE, etc. Ability to run large-scale programs that aren't possible locally.

ACCELQ is an AI-powered, no-code test automation and management on a cloud-native platform. It offers a unified solution for web, mobile, API, database, and packaged apps. With automation-first, codeless capabilities, testing teams can easily use it without technical or programming expertise. ACCELQ enables businesses to achieve 3x productivity and over 70% cost savings through its pioneering autonomics-based automation platform. Recognized as a leader in The Forrester Wave™: Continuous Automation Testing Platforms, Q4 2022, ACCELQ stands out in the industry.

Craft, troubleshoot, and evaluate APIs with a human touch rather than a mechanical approach. At last, a workflow that you'll genuinely appreciate. Introducing the Collaborative API Design Tool, which provides a platform for creating, validating, and overseeing OpenAPI specifications. This Desktop API client facilitates interactions with both REST and GraphQL. You can make requests and analyze responses seamlessly. Effortlessly create and organize your requests, set up environment variables, manage authentication, produce code snippets, and much more. Dive deep into response details—explore the entire request timeline, including status codes, body, headers, cookies, and additional information. Organize your project with workspaces, folders, and environments, utilizing a drag-and-drop interface for requests, along with straightforward data import and export options. Within a single collaborative API design editor, you can create, modify, lint, troubleshoot, preview, and manage your OpenAPI specifications. Additionally, generate configurations for popular API gateways such as the Kong API Gateway and Kong for Kubernetes. Synchronize your API designs with version control systems like GitHub or GitLab, and deploy directly to API gateways such as Kong with just a click, streamlining your development process significantly. This tool not only enhances productivity but also fosters collaboration among teams in designing robust APIs.

Evaluating and verifying REST services in Java can be more challenging compared to using dynamic languages like Ruby and Groovy. However, REST Assured introduces a level of ease and accessibility akin to those languages within the Java ecosystem, making the process more straightforward for developers. By leveraging REST Assured, Java programmers can streamline their testing efforts and enhance productivity significantly.

Test Mace is a robust and contemporary cross-platform solution designed for API interaction and the creation of automated API tests. It allows users to formulate requests and scenarios while utilizing features such as variables, authentication, an autocomplete function, and syntax highlighting. The tool provides a user-friendly interface that simplifies the development of intricate scenarios. With a single click, users can execute comprehensive regression tests. Additionally, results from requests can be stored in variables for access from various nodes. Users can also retain authorization tokens, response headers, or specific segments of response bodies, enhancing their testing capabilities. Scenarios can be executed across different environmental contexts, which aids in the management of development, staging, and production environments. The built-in authentication methods cater to the most widely-used authentication types, streamlining the process for users. Furthermore, the quick share feature enables effortless sharing of requests with team members; users simply need to click a button to copy the URL of a specific node, allowing them to easily distribute it to their colleagues. This seamless collaboration is essential for effective teamwork and enhances productivity during API testing.

Pynt, an innovative API Security Testing Platform, exposes verified API threats by simulating attacks. We help hundreds companies, including Telefonica, Sage and Halodoc to continuously monitor, categorize and attack poorly secured APIs before hackers do. Pynt’s uses a unique hacking technology and an integrated shift-left strategy, using home-grown attack scenario, to detect real threats. It also helps to discover APIs and suggest fixes for verified vulnerabilities. Pynt is trusted by thousands of companies to protect the No. As part of their AppSec strategies, a number of companies rely on Pynt to secure the no.

Sparrow provides a comprehensive toolkit designed to enhance the entire API lifecycle, guiding research and development teams towards achieving excellence in design-first API development. With cURL, users can easily send API requests while supporting essential methods such as GET and POST. This platform simplifies API interactions by efficiently managing headers, data, and authentication. As a collaborative open-source solution for API development, Sparrow streamlines the creation of outstanding APIs. Through collaborative efforts, developers are able to advance their practices earlier in the development timeline, resulting in more robust APIs and expedited delivery. Users can enjoy seamless parallel testing across various environments, allowing them to gather valuable insights in real-time. Furthermore, Sparrow equips users with powerful tools to secure and manage their API data, along with the option for self-hosting, granting full control over their testing environments. Additionally, users can remain informed about the latest updates, insights, and resources provided by Sparrow to further enhance their development experience. This commitment to continuous improvement ensures that developers are always equipped with the best practices and innovations in API development.

Hoppscotch simplifies the process of creating and testing APIs, enabling quicker product launches. Build APIs with speed, conduct instant tests, and automatically document and share your work. From initial prototypes to final production, you can develop efficiently without the hassle of switching between different tabs. Everything necessary for seamless API development is provided by Hoppscotch. Set up dedicated workspaces for your teams, controlling access as needed. Collaborate with your colleagues in real-time, ensuring smooth teamwork. You can even deploy Hoppscotch on your own servers for added flexibility. Organize your requests into collections or folders to facilitate sharing with your team. Manage your environment variables for consistent usage across your projects. Additionally, keep track of your request history for easy reference. Modify headers, authenticate your requests, generate random data, and explore many more features at your disposal. Test your APIs thoroughly and write assertions to verify responses. Hoppscotch supports over 30 languages, allowing you to use it in your preferred tongue. Keep an eye on all activities within your workspace, tracking who performed actions and when. Utilize your existing SSO provider for easy login to Hoppscotch, and efficiently manage your users, workspaces, and other resources. Furthermore, the intuitive interface ensures that both novices and experienced developers can navigate the platform effortlessly.