Best Free API Testing Tools of 2025 - Page 2

Loader.io offers a complimentary load testing service designed to evaluate the performance of your web applications and APIs by simulating thousands of simultaneous connections. You can easily register your application for testing through either the web interface or API. During the testing period, we will generate connections to your application, allowing you to observe the process in real-time. After the test is complete, you can conveniently share the results with your team for further analysis and discussion. This tool is invaluable for ensuring your application can handle high traffic effectively.

RapidAPI Testing offers a comprehensive solution for functional API testing and monitoring, featuring a user-friendly interface and compatibility with all types of APIs, as well as seamless integration with the RapidAPI Marketplace and Enterprise Hub. This tool empowers users and organizations to ensure the reliability of their APIs through sophisticated functional tests designed for thorough validation. It also allows for centralized monitoring of API tests across diverse geographical locations, enhancing overall efficiency by integrating with CI/CD pipelines and fostering collaboration among teams. Furthermore, RapidAPI Testing supports users in crafting tailored functional test flows that ensure robust validation of REST, SOAP, and GraphQL APIs. With an accessible interface, it presents three distinct options for test creation, making it easy for both developers and non-developers to generate visual, automated, or code-based tests that meet their specific needs. Overall, RapidAPI Testing streamlines the API testing process, ensuring that all users can efficiently verify the functionality of their APIs.

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.

Utilize our script generator to craft a testing script in either JavaScript or CoffeeScript. This script should configure the request parameters and perform validation on the responses received. Ping-API is designed to execute your test scripts across global servers located in the United States, Japan, Germany, and Singapore, allowing for comprehensive testing of your APIs. You can schedule these tests to monitor the performance of your APIs. In the event of a test failure, we will promptly deliver the details of the failure through email, Slack, and HipChat notifications. Ping-API provides the flexibility to write your test scripts in JavaScript or CoffeeScript, enabling you to specify the request URL parameters, headers, and body while also validating the response headers and body. The script generator simplifies the process, allowing you to focus on setting the parameters of your API, and it will produce the necessary test script for you. It’s user-friendly and designed for web developers who need to be alerted when their website is down or when an unexpected response occurs. Additionally, Ping-API allows you to schedule your tests to run every minute or hour, ensuring you receive timely notifications in case of any issues with your API tests. You can count on us to help keep your services running smoothly.

Stoplight is an API Design, Development, & Documentation platform. Stoplight Platform enables consistency, reuseability, quality, and ease in your API lifecycle. Here's what Stoplight Platform can do for you: Stoplight Studio's visual designer makes it easy to design APIs Stoplight Prism mocking allows you to automatically create mock API designs - Invite external and internal users to give feedback and collaborate on your designs - Create faster and more powerful APIs - Use Stoplight Spectral to test and enforce style guidelines To create a pleasant experience, document both internal and externe APIs automatically To quickly scale up API programs that are well-governed, standardized, and collaborative, you can use and integrate design-first workflows.

Keep track of the performance and status of your API endpoints and essential website transactions using a single, user-friendly dashboard. Checkly serves as a proactive reliability platform that merges the advantages of end-to-end testing with continuous monitoring, specifically tailored for contemporary, cross-functional DevOps teams. Emphasizing JavaScript-based open-source technology stacks, Checkly offers a straightforward setup process and integrates smoothly into your existing development processes. As the go-to platform for API and end-to-end monitoring in modern environments, Checkly is programmable, adaptable, and enthusiastically supports JavaScript. Ensure your important website transactions are continuously monitored and validated, while also capturing screenshots to provide immediate insights into operational performance. Automating browser click-flows has become significantly easier; utilize modern open-source tools such as Playwright and Puppeteer for seamless flow automation. Execute your monitoring checks from 20 different locations globally to guarantee that your APIs respond swiftly and deliver the correct data payload consistently. By leveraging Checkly, you can enhance the reliability and performance of your web applications while simplifying your testing processes.

Bright Security offers a developer-focused Dynamic Application Security Testing (DAST) solution designed to help organizations rapidly and cost-effectively deliver secure applications and APIs. Its methodology allows for swift and iterative scans to detect critical security vulnerabilities early in the software development lifecycle (SDLC), all while maintaining high quality and rapid delivery. Bright enables Application Security (AppSec) teams to implement governance for the protection of APIs and web applications, empowering developers to take charge of security testing and the necessary remediation processes. In contrast to traditional DAST solutions that are tailored for AppSec specialists and often prove to be cumbersome to implement—resulting in vulnerabilities being discovered late in the development cycle—Bright's DAST solution is crafted to thrive in a DevOps environment. It can be integrated as soon as the Unit Testing phase and can be utilized throughout the SDLC, continually learning and optimizing from each scan. By facilitating the early detection and remediation of vulnerabilities within the SDLC, Bright not only mitigates risk but also does so in a more economical and less labor-intensive manner. This proactive approach ultimately strengthens the overall security posture of organizations while streamlining the development process.

Cybercriminals are increasingly exploiting vulnerabilities within API logic. It is essential to understand how to secure APIs effectively to avert breaches and safeguard against data leaks. APIsec identifies critical weaknesses in API logic that hackers exploit to access confidential information. In contrast to conventional security measures that focus solely on prevalent issues like injection attacks and cross-site scripting, APIsec conducts comprehensive pressure tests on the entire API, ensuring that no endpoints are vulnerable to exploitation. By utilizing APIsec, you can be informed of potential vulnerabilities in your APIs prior to their deployment, preventing malicious actors from taking advantage of them. You can execute APIsec tests at any phase of the development cycle to uncover loopholes that might inadvertently allow unauthorized access to sensitive data and functionalities. Importantly, prioritizing security does not need to impede development; APIsec operates at the pace of DevOps, providing ongoing insights into your APIs' security status. With APIsec, you can complete tests in mere minutes, eliminating the need to wait for the next scheduled penetration test. This proactive approach not only enhances security but also streamlines the development process significantly.

TeejLab is pioneering the integration of data science and machine learning to assist organizations in navigating the complexities of the API economy. As the sole industry solution tailored for API governance on a global scale, we invite you to consider your security and compliance stance regarding mainframe and legacy applications that interface with both internal and external information systems through APIs. Our innovative software composition analysis system stands as the world's first tool designed to uncover shadow, hidden, private, and public APIs using a meticulously curated knowledge base. Just as Google transformed the landscape for websites, TeejLab is revolutionizing the world of Web APIs. Our versatile product suite addresses the diverse API governance requirements of enterprises and communities in a cost-effective manner, while also allowing for the seamless addition of new features as those demands change. Whether your organization is primarily focused on discovering and benchmarking APIs or is a seasoned producer or consumer of APIs looking to enhance your offerings, we have a comprehensive solution to meet your needs and drive your success further. With our expertise, we empower businesses to navigate the ever-changing digital landscape with confidence.

You can either submit API test requests through the user interface form or trigger the EthicalCheck API using tools like cURL or Postman. To input your request, you will need a public-facing OpenAPI Specification URL, an authentication token that remains valid for a minimum of 10 minutes, an active license key, and your email address. The EthicalCheck engine autonomously generates and executes tailored security tests for your APIs based on the OWASP API Top 10 list, effectively filtering out false positives from the outcomes while producing a customized report that is easily digestible for developers, which is then sent directly to your email. As noted by Gartner, APIs represent the most common target for attacks, with hackers and automated bots exploiting vulnerabilities that have led to significant security breaches in numerous organizations. This system ensures that you only see genuine vulnerabilities, as false positives are systematically excluded from the results. Furthermore, you can produce high-quality penetration testing reports suitable for enterprise use, allowing you to share them confidently with developers, customers, partners, and compliance teams alike. Utilizing EthicalCheck can be likened to conducting a private bug-bounty program that enhances your security posture effectively. By opting for EthicalCheck, you are taking a proactive step in safeguarding your API infrastructure.

Akto is an open source, instant API security platform that takes only 60 secs to get started. Akto is used by security teams to maintain a continuous inventory of APIs, test APIs for vulnerabilities and find runtime issues. Akto offers tests for all OWASP top 10 and HackerOne Top 10 categories including BOLA, authentication, SSRF, XSS, security configurations, etc. Akto's powerful testing engine runs variety of business logic tests by reading traffic data to understand API traffic pattern leading to reduced false positives. Akto can integrate with multiple traffic sources - Burpsuite, AWS, postman, GCP, gateways, etc.

Illustrate sample API requests and their corresponding responses while articulating the logic of API endpoints in plain language. Conduct tests on your API endpoints and adjust your prompt, response format, and request format as needed. With a simple click, deploy your API endpoints and seamlessly integrate them into your applications. Create and launch intricate application functionalities without needing to write any code, all within a minute. No need for individual LLM accounts; just register for Backengine and begin your development process. Your endpoints operate on our high-performance backend architecture, accessible instantly. All endpoints are designed to be secure and safeguarded, ensuring that only you and your applications can access them. Effortlessly manage your team members so that everyone can collaboratively work on your Backengine endpoints. Enhance your Backengine endpoints by incorporating persistent data, making it a comprehensive backend alternative. Additionally, you can utilize external APIs within your endpoints without the hassle of manual integration. This approach not only simplifies the development process but also enhances overall productivity.

Tigmat allows you to automate your tests without writing a single line. Tigmat supports Web applications, Android Web applications, and APIs. You can record both Web and Android applications. These tools allow you to change anything without having to worry about code. Test Execution is supported by more than 60 Real Android Devices as well as Windows, Linux, Firefox, Chrome and Edge to provide the best coverage. You can sign up for a free trial and use all the features to see if Tigmat is right for you. Each test is recorded in a video that you can view. Among the many features offered are CICD integration, user management and user management. Try Tigmat today and see how it can help you reach your goals.

Experience seamless navigation through a tidy and organized interface, enabling you to concentrate on the essential aspects of effectively testing and collaborating on APIs. Firecamp provides a user-centric design alongside a variety of robust features, facilitating an efficient API development process and improving teamwork among members. You can dynamically set variable values for use throughout the platform, ensuring consistency and ease of access. Additionally, create visually appealing API documentation to share with both your team and the wider community. Execute API Collection Tests directly in the terminal or integrate them into your CI/CD pipeline, while also testing and troubleshooting your authentication endpoints with support for multiple authentication methods. This comprehensive approach not only boosts productivity but also fosters a collaborative environment for API development.

Elevate your API journey, streamline consumption, foster collaboration, and enhance developer experience with our versatile, enterprise-grade One APIMarketplace. This platform mitigates API sprawl and simplifies complexities by operationalizing APIs, ensuring they are easily discoverable, consumable, and accessible for collaboration. By enabling faster time to market, One APIMarketplace effectively boosts API adoption through improved accessibility, insightful performance metrics, and increased consumption rates. Equip developers with user-friendly documentation, community support, valuable resources, SDKs, and sandbox environments to further expedite API adoption. One APIMarketplace not only simplifies the discovery and utilization of APIs but also guarantees a seamless experience for both developers and enterprises. With extensive documentation available and the ability to test APIs in a sandbox prior to integration, users can confidently proceed with their projects. Additionally, our robust analytics dashboard provides vital insights into API usage, performance metrics, and user engagement, allowing for informed decision-making.

Testfully offers an extensive array of features, ranging from robust API client capabilities to sophisticated testing and monitoring functionalities. Users can take advantage of versatile cloud and offline storage options, facilitate effortless collaboration among teams, and enjoy straightforward migration, all within a single, comprehensive multi-platform tool. The platform simplifies the transition of data from Postman or Insomnia, allowing for seamless integration into Testfully. With a focus on flexibility and security, users can establish global, environment, and folder variables tailored to either the workspace or individual users. The tool also allows for the customization of authentication methods, parameters, headers, and body content, making it easy to create any HTTP request. Collaboration is made simple as you can invite team members, assign specific roles, and manage folder permissions effectively. Testfully supports major authorization schemes such as OAuth2, ensuring secure and efficient access management. Whether you are dealing with straightforward tasks or more intricate scenarios, Testfully streamlines the testing process without requiring any coding skills, thus making advanced API testing more approachable and user-friendly. Users can execute requests within a folder either simultaneously, sequentially, or in a random order with a single click, enhancing efficiency. Additionally, it allows for response validation and contract testing through a declarative format, further eliminating the need for coding and simplifying the overall testing experience. Overall, Testfully is designed to cater to both novice and experienced users, ensuring that everyone can leverage its capabilities effectively.

Enhance your software development journey with our powerful API solution, guaranteeing stability, high performance, and dependability in every release. Experience seamless integration with CI/CD to create a unified development pipeline. API Swan is committed to building a software testing platform that exemplifies both cost-effectiveness and reliability, specifically tailored for engineering teams in the dynamic landscape of early-growth startups. Accelerate your product delivery by tenfold while effortlessly identifying and resolving more bugs. Our 24/7 application monitoring ensures consistent and uninterrupted performance. The platform automatically generates regression tests based on network traffic, providing a cutting-edge approach to automated test case design that fits smoothly into your existing workflow. Additionally, the effortless automatic documentation of APIs and schemas not only enhances clarity but also conserves valuable time for your team. With API Swan, your development process becomes more efficient and streamlined than ever before.

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.

Hoverfly Cloud, a SaaS solution owned by iOCO, enables organizations to accelerate delivery, minimize expenses, and launch robust software more quickly. Built with integration, automation, and performance in mind, Hoverfly Cloud empowers developers and testers to substitute the APIs their applications rely on with adaptable, lightweight simulations. This approach separates the development and testing phases from unreliable and costly test systems, as well as restrictive API sandboxes. The platform allows for the configuration of API simulations that can mimic unpredictable behaviors such as high latency or random failures, ensuring applications can handle issues gracefully when their dependent APIs falter. With its highly cost-effective operational expenses, even during intensive and intricate testing scenarios, Hoverfly Cloud simplifies the creation of API mocks and simulations, enabling users to do so in mere minutes with a comprehensive testing solution devoid of unnecessary complexities. This efficiency not only streamlines the testing process but also enhances overall software quality and reliability.

Rapidly establish endpoints, create tailored data, and execute operations via a RESTful interface. Specify the resource schema along with data generators for every field. Establish relationships between resources and automatically generate the corresponding endpoints. MockAPI serves as an intuitive tool that enables users to effortlessly simulate APIs. It is designed to facilitate prototyping, testing, and educational purposes, making the development process smoother and more efficient. Whether for developers or learners, this tool provides a practical solution for API-related tasks.

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.

Qodex.ai is an innovative platform that harnesses AI technology to enhance the efficiency of API testing and documentation, delivering complete automation without the need for human input. Designed specifically for developers, it empowers users to create tests using plain English, removing the necessity of coding skills. The platform dynamically adjusts to changes in products, ensuring that test coverage remains consistent over time. Users can either upload their existing API files or leverage Qodex's SDK to develop new APIs that are ready for testing in just a few minutes. The AI component intelligently learns the API structure and automatically generates tests, while also allowing for the creation of tailored tests through simple English requirements. Tests can be executed at any time, providing straightforward reports that enable quick identification and resolution of problems. Additionally, the platform features interactive API documentation, where users can pose questions and receive immediate answers in a user-friendly format, making it an invaluable resource for both front-end and back-end testing. Furthermore, its seamless integration into the development workflow enhances productivity and ensures a smoother testing process.

All-in-one solution for test automation You can get started quickly and scale up to any level for any team. Katalon Studio Robust testing on all platforms Productive IDE allows you to easily create automated tests for all platforms and OSs, regardless how complex your application is. A powerful recording utility that stores all UI elements in a single place to maximize reusability. For beginners, codeless experience Experts can extend their testing capabilities. Set up projects Templates for projects with built-in features Start immediately with pre-made templates, test cases libraries, keywords, object repositories, and other useful tools. All types of end-to-end testing at one place Uniquely perform web and mobile testing - all within a single project

Keysight Eggplant, part of Keysight Technologies’ software portfolio, redefines quality assurance through intelligent, low-code, and AI-driven test automation. Designed for cross-platform functionality, Eggplant automates functional, regression, and performance testing for desktop, mobile, web, and embedded systems. Its computer vision and machine learning models allow testing from the user’s perspective, detecting visual errors, layout issues, and UX problems that code-based tools often miss. Eggplant integrates natively with leading DevOps tools—including Jenkins, Azure DevOps, and GitHub Actions—to enable continuous testing and accelerate release cycles. Its solutions suite includes Eggplant Test, Eggplant Performance, Eggplant Monitoring, and Keysight Generator, covering the full software lifecycle from test creation to real-time monitoring. The platform’s predictive monitoring identifies performance issues before they impact end users, ensuring consistent uptime and optimized experiences. With measurable results such as 93% reduction in manual testing time and 92% reduction in QA labor hours, Eggplant delivers transformative productivity for modern QA teams. By combining automation, AI, and analytics, Keysight Eggplant empowers organizations to innovate faster and release software with confidence.