Best Postman Alternatives for API Testing with AI in 2025

Katalon is a comprehensive test automation platform that empowers teams to build, execute, and manage automated tests for web, mobile, and API applications. It offers a suite of tools that cater to the entire testing lifecycle, from design and development to execution and reporting. Katalon's ease of use, powerful features, and flexible pricing make it a popular choice for organizations of all sizes.

Pricing:
Katalon offers a variety of pricing options to suit different needs and team sizes:

Free: Access Katalon Studio, Katalon Runtime Engine, and limited TestOps features for personal or non-commercial projects.Team: Collaborate with your team on test automation projects using Katalon TestOps, starting at $99 per user per month.

• Pros:

1. Ease of Use: Katalon's no-code approach and intuitive interface make it easy to learn and use, even for non-technical testers.

2. Flexible Pricing: Katalon's tiered pricing structure makes it affordable for teams of all sizes.
   
   

• Cons:

1. Learning Curve: While easy to learn, some features may require some initial training for full utilization.

2. Reporting Capabilities: Reporting options could be further enhanced for more comprehensive analysis.

3. Maintenance Overhead: Keeping up-to-date with API changes may require some manual effort.

8. Postman

Postman is a well-known tool in the API testing landscape, offering a blend of user-friendliness and powerful features tailored for testers, developers, and teams collaborating on API projects. Its straightforward interface allows newcomers to get up and running with minimal setup—simply download, sign in, and you’re ready to start exploring and testing APIs.

• Advantages:

1. User-Friendly Experience: Postman’s interface is designed with ease of use in mind, enabling both beginners and experienced testers to quickly create, send, and manage API requests without a steep learning curve.

2. Comprehensive API Testing: The platform supports a wide range of HTTP methods and offers robust testing options, including environment management, automated testing scripts, and assertion checkpoints to ensure your APIs behave as expected.

3. Collaboration and Integration: Real-time collaboration features make it easy for teams to work together on API collections, with built-in version control helping to keep projects organized. Postman also integrates seamlessly with popular CI/CD tools and services, enhancing end-to-end workflow efficiency.

4. Extensive Ecosystem: A growing library of integrations with popular development tools—such as Jenkins, GitHub, and Slack—makes Postman adaptable to different workflows and tech stacks.

9. Hoppscotch

Hoppscotch is another open-source tool designed to make API development and testing both straightforward and accessible. It stands out for its speed and flexibility, allowing you to get started immediately—no account required.

• Key Features:

  1. Effortless API Exploration: Hoppscotch provides a clean, intuitive interface for building and testing HTTP requests. Whether you’re working with REST, GraphQL, or even WebSocket protocols, you can quickly set up and debug endpoints.

  2. Real-time Feedback: See live responses and request data as you work, making it easy to track down issues and validate your API logic on the fly.

  3. Supports Multiple Platforms: Available as a web app, desktop app, or browser extension, it works seamlessly across Windows, macOS, and Linux.

  4. Wide Protocol Support: Beyond REST and GraphQL, Hoppscotch accommodates different HTTP methods—including GET, POST, PUT, DELETE, PATCH, and OPTIONS—for comprehensive API testing.

  5. Organizational Tools: You can group requests into collections and utilize import/export functionality, making it easier to manage complex projects or share your work with others.

  6. Customizable Testing: Modify headers, parameters, and data payloads with ease. Built-in validation helps ensure your responses match the expected status codes and formats.

Pricing:
Hoppscotch is entirely free to use, with all features accessible out of the box.

• Pros:

1. Streamlined and accessible: Jump in without setup hassles—no accounts or paywalls.

2. Lightweight and fast: Minimal footprint with quick response times.

3. Multi-protocol support: Great versatility for various API architectures.

• Cons:

1. Limited advanced automation: It may lack some of the more robust automated testing and team collaboration features found in other platforms.

2. Basic feature set: While perfect for most API testing needs, some advanced enterprise integrations are not available.
   
   

9. Karate

Karate provides a versatile, open-source solution for API automation and testing, built on Java but designed to be accessible even for testers without extensive programming backgrounds. Its syntax is user-friendly, mirroring Gherkin, which simplifies writing and understanding test scenarios for teams across varying skill levels.

• Key Features:

1. Low Barrier to Entry: Intuitive syntax allows newcomers and non-developers to create and maintain API tests with ease.

2. Gherkin-Like Structure: Natively supports descriptive, human-readable test specifications to boost collaboration.

3. Integrated HTTP Testing: Directly supports REST API testing out-of-the-box, removing the need for external libraries or plugins.

4. Customizable and Extensible: Offers the flexibility to enhance your tests with additional Java code as needed.
   
   

Pricing:
Karate is distributed as a free, open-source framework, making it a cost-effective option for organizations seeking robust automation tools.

10. cURL

cURL is a versatile command-line tool that enables users to interact directly with servers by sending and receiving data over a wide range of protocols, including HTTP, HTTPS, and FTP. Known for its lightweight design, cURL is especially popular for API testing, thanks to its seamless integration into scripts and automation workflows.

• Key Functionalities:

  • Scriptability & Automation: As a command-line utility, cURL is easy to include within automation scripts and CI/CD pipelines, making it a staple in streamlined testing environments.

  • Security & Verification: It supports SSL/TLS certificate validation by default, ensuring that connections to APIs remain secure and authentic.

  • Cross-Platform Support: cURL operates consistently across major operating systems such as Windows, macOS, and Linux, giving teams flexibility in their choice of testing environment.

  • Extensive Protocol & Feature Set: With support for a wide array of transfer protocols and advanced features—like file uploads, authentication, proxy handling, and more—cURL adapts to a broad range of API testing needs.

  • Customizability & Integration: Its extensive configuration options and available bindings allow effortless integration into existing development stacks or test setups.

Pricing:
cURL is open-source and completely free to use, making it accessible for both individual testers and large teams.

• Pros:

1. Lightweight and Efficient: Because it operates from the command line, cURL requires minimal resources, making tests fast and easily reproducible.

2. Flexible Integration: Works well within existing pipelines, supporting a broad variety of scripting and automation tasks.

3. Broad Protocol Support: Suitable for testing not just REST APIs but a range of network-based services thanks to its wide protocol coverage.

• Cons:

1. Steep Learning Curve: Since it uses command-line syntax, beginners may find it less approachable than GUI-based tools.

2. Manual Reporting: Unlike some dedicated testing platforms, cURL doesn’t provide built-in reporting or dashboards, requiring users to build their own solutions for result analysis.

11. HTTPie

HTTPie stands out as a versatile command-line tool tailored for API testing, offering an approachable alternative to traditional CLI utilities like cURL. Its clean, readable syntax allows both novices and experienced developers to craft HTTP requests efficiently—making it a favorite for quick API interactions and debugging tasks straight from the terminal.

• Key Features:

HTTPie comes packed with practical capabilities, including:

• User-friendly, color-coded terminal output for clear, at-a-glance responses

• Native support for working with JSON, easing both request formatting and response inspection

• Simple commands to handle form submissions, file uploads, custom headers, and raw body data

• Seamless management of persistent sessions for multi-step API scenarios

• Download functionality reminiscent of classic tools like Wget

• Compatibility across major platforms, including Windows, macOS, Linux, and FreeBSD

Pricing:
HTTPie is completely open-source, making it freely accessible for all users.

• Pros:

1. Intuitive Syntax: The straightforward command structure lowers the barrier for users who may find other CLI tools daunting.

2. Readable Output: Built-in formatting and colors translate to faster diagnostics and cleaner terminal history.

3. Cross-Platform: Consistent experience, no matter your preferred operating system.

• Cons:

1. No GUI: All interactions are command-line only—so if you’re seeking a graphical interface, this won’t fit the bill.

2. Advanced Automation: While HTTPie is excellent for single requests or exploratory testing, it doesn't natively offer the robust test management features found in some larger frameworks.

12. Bruno

Bruno is an emerging open-source API client designed to offer an efficient, privacy-first alternative to established tools like Postman and Insomnia. What makes Bruno stand out is its approach to managing API collections: everything is stored directly on your local machine in plain text, giving you complete control and easy versioning with tools like Git.

• Key Features:

1. Local Storage: API collections are saved on your filesystem, enabling straightforward file management and seamless integration with your existing Git workflow.

2. Plain Text Format: Requests are managed with a simple markup language (Bru), making it easier to read, edit, and share API documentation and tests.

3. Offline-Only Operation: With no reliance on the cloud, your collections remain securely on your device, ensuring maximum data privacy and control.

4. Open Source & Customizable: As an open-source tool, Bruno allows for community contributions and customization to fit unique team requirements.
   
   

Pricing:
Completely free and open-source—ideal for individuals and teams at any budget.

13. Apigee

Apigee is Google Cloud’s robust API management platform, providing end-to-end solutions for designing, deploying, monitoring, and securing APIs at scale. With a focus on flexibility, control, and advanced analytics, Apigee equips organizations to handle complex API environments across diverse teams and applications.

• Key Features:

1. Comprehensive API Lifecycle Management: Apigee Edge offers tools for the complete API lifecycle, including design, development, testing, deployment, and monitoring—all within a unified environment.

2. Security and Access Controls: Granular policies and security features help protect sensitive data by restricting and managing API access.

3. Advanced Traffic Management: Load balancing, automatic scaling, and built-in failover keep APIs reliable and responsive, even under heavy demand.

4. Insightful Analytics: Real-time monitoring and detailed analytics allow teams to track API performance, usage, and troubleshooting metrics.

5. Developer Portal: Apigee’s customizable portal makes it easier for organizations to publish documentation and provide SDKs, fostering collaboration and smooth API adoption.

6. Integration Support: The platform seamlessly integrates with a variety of programming languages, frameworks, and third-party tools.

Pricing:
Apigee operates on a quote-based pricing model tailored to enterprise needs and usage. While there isn’t public standardized pricing, interested users can take advantage of a free trial and contact Google Cloud directly for a custom quote.

14. Tricentis Tosca

Tricentis Tosca is a robust, enterprise-grade test automation tool built to streamline end-to-end functional, integration, and regression testing. Its standout feature is a model-based testing approach, which lets teams develop and maintain test cases using visual workflows that reflect actual business processes—no deep-dive coding required.

• Features:

1. Model-Based Testing: Tosca uses intuitive visual models, simplifying test creation and maintenance for even the most complex systems.

2. API Testing Capabilities: Leverage a dedicated module to design sophisticated API test cases with drag-and-drop convenience, minimizing manual scripting.

3. End-to-End Automation: Seamlessly combine API and UI tests for comprehensive automation across web, mobile, SAP, and more.

4. Automated Test Generation: Instantly generate test cases from API documentation, accelerating coverage and reducing manual effort.

5. Scriptless Test Design: Lower the learning curve for teams, enhancing both collaboration and transparency.

6. Scalability: Tosca flexes with your organization’s needs, easily supporting growth as your testing requirements expand.

7. Business-Readable Test Cases: Automatically processes API requests and responses, transforming technical data into business-friendly test cases for improved clarity.
   
   

Pricing:
Tricentis Tosca follows an enterprise pricing model, so detailed rates are only available by request.

15. Paw

Paw is a dedicated API testing and development tool designed specifically for macOS users. Tailored for seamless desktop integration, it streamlines the process of crafting, sending, and managing HTTP requests, making it especially useful for teams working closely across the API lifecycle.

• Key Features:

1. Native macOS Experience: Built specifically for macOS, ensuring a smooth and integrated workflow.

2. Comprehensive HTTP Toolkit: Offers a robust visual editor and supports various HTTP protocols and authentication schemes, including OAuth 1.0 and 2.0.

3. Collaboration: Enables real-time updates and easy sharing, so developers, testers, and stakeholders can work together efficiently.

4. Standards Compliance: Compatible with JSON schema, Swagger, and RAML, helping teams maintain clear and organized API definitions.

5. Mocking & Documentation: Comes with a built-in mock server and the ability to auto-generate API documentation directly from your requests.

6. Extensibility: Supports custom scripts and plugins, plus automatic code generation for languages like Objective-C, Swift, and JavaScript.
   
   

Pricing:
Paw provides a free tier catering to both personal and professional use. For larger teams, paid plans start at $60 per month for up to six users.

16. Assertible

Assertible is a cloud-based tool built for automating API testing and ongoing monitoring, making it a solid pick for developers and QA teams who want to make sure their APIs perform reliably and securely.

• It brings a suite of robust features designed to streamline the entire API testing process:

  1. Automated API testing: Assertible helps you set up automated tests, ensuring every endpoint works as intended with each deployment. You’ll find support for JSON Schema validation, parameterized tests, and chaining assertions for thorough coverage.

  2. Dynamic variables & logic: Test intricate API workflows using dynamic variables, conditional logic, and webhooks—perfect for scenarios that require adaptability.

  3. Codeless API monitoring: Even without coding expertise, you can schedule automated runs to check API health and catch failures early, thanks to the intuitive codeless monitoring feature.

  4. Real-time alerts: Receive instant notifications via email, SMS, or Slack if your APIs hit a snag, helping you respond proactively to issues.

  5. Team collaboration: Assertible makes teamwork easy, allowing collaborators to work together on test cases and monitoring setups.

  6. Comprehensive reporting: Dig into detailed reports on performance metrics, response times, error rates, and more to get a clear picture of your API’s reliability.

  7. Integration ready: Works seamlessly with services like GitHub, Slack, Zapier, and supports OpenAPI for convenient setup in your existing workflow.

Pricing:
Assertible offers a free plan with core functionality. For teams or advanced needs (like more frequent testing or additional users), paid plans start at $50 per month.

• Pros:

1. Automation-centric: Assertible’s focus on automation saves time, especially for CI/CD pipelines.

2. Collaborative environment: Built-in collaboration is ideal for teams managing shared APIs.
   
   

• Cons:

1. Advanced scenarios may require adjustment: While codeless monitoring is beginner-friendly, very complex testing might require manual tuning.

2. Free plan is limited: To unlock extensive features and increased usage, a subscription is required.

Understanding API Testing

API testing is the process of checking the functionality, security, and performance of APIs to ensure they work as intended under various conditions. Modern API testing goes beyond simple request-response validation—it also involves verifying data integrity, handling edge cases, and assessing how well APIs perform under load. Effective testing helps catch bugs early, strengthens security, and improves the overall quality of your applications.

API Testing Tools for Data-Driven and Automated Workflows

Several robust API testing tools are designed to streamline both data-driven and automated testing workflows. These solutions cater to testers who value flexibility, thorough reporting, and easy integrations—traits that are highly sought after in today’s rapidly evolving QA landscape.

• Data-Driven Testing Features:
  Many major tools offer data-driven capabilities, allowing you to run the same API test with multiple data sets. For example, testers can import data from sources such as CSV, XLS, or databases, enabling comprehensive coverage and automation. Test artifacts—like test objects and API definitions—are commonly organized in reusable repositories, minimizing duplicated effort across projects.

• Automated Test Creation and Execution:
  Codeless authoring is now the norm, with intuitive interfaces and drag-and-drop keyword libraries that speed up test development. Built-in record-and-playback tools help testers build even complex scenarios efficiently. Automation engines typically enable tests to be scheduled or executed across diverse environments, including local setups and cloud-based infrastructure, with seamless support for SOAP, REST, and GraphQL requests.

• Comprehensive Test Analysis:
  After execution, detailed metrics and reports help testers quickly identify issues and bottlenecks. Integrations with collaboration tools like Slack, Teams, and JIRA boost visibility and keep teams in sync.

• End-to-End Workflow Support:
  Look for tools offering native plugins and integrations for continuous integration (CI), DevOps pipelines, and popular repositories. These features facilitate smooth collaboration and ensure that test assets are easily maintained and updated as APIs evolve.

• Third-Party Alternatives:
  If you’re seeking options beyond the mainstream, tools such as SoapUI offer an open-source approach with advanced functionality—including load and security testing capabilities, extensive scripting support, data-driven testing, and robust protocol compatibility (HTTP, JMS, JDBC, and more). Tests can often be reused, scripted, or even run from the command line. SoapUI also supports mock service creation, enabling isolated component testing.

• No-Code and Quick-Start Solutions:
  Solutions like TestSigma minimize the setup required to get started and focus on codeless workflows. Users can customize API call sequences, store reusable data sets as parameters, and run end-to-end API and UI tests—all without writing code. Flexible result validation modes and easy-to-use interfaces make these platforms accessible for testers with varying technical backgrounds.

In summary, these API testing tools are built for teams that need dependable, scalable solutions for data-driven and automated testing. Whether you’re a solo developer or part of a large QA department, you’re certain to find a platform that fits your workflow and technical requirements.

Limitations of Postman for Automated API Testing and CI/CD Integration

While Postman is widely regarded as a user-friendly tool for manual API testing, there are some distinct challenges when leveraging it for large-scale automation or integrating with modern software delivery pipelines.

• Gaps in Automated Validation:
  Postman’s core strengths lie in manual test execution. Its automated validation features are more limited, making it less suited to scenarios where stability and consistent performance checks are required across frequent releases.

• Restricted Reporting Functionality:
  Comprehensive test reports are not readily available in all versions, with advanced reporting typically locked behind higher-tier plans. This can hinder visibility and collaboration, especially for larger teams.

• Reuse and Maintenance Concerns:
  Test scripts created in Postman often require manual replication or modification for each new API or project. The platform offers limited features for reusing scripts or maintaining test collections over time, leading to duplicated effort and increased maintenance burdens.

• Integration Limitations:
  Continuous integration and delivery (CI/CD) support is not inherently robust in Postman compared to purpose-built automation platforms. Integration with Agile workflows, DevOps toolchains, and the ability to shift testing earlier in the development cycle (shift-left) are less seamless, as the tool was initially designed for standalone testing rather than as a deeply integrated component of a CI/CD process.

Integrating API Testing Tools with CI/CD Pipelines and Version Control

Modern API testing tools are built with seamless integration in mind, especially when it comes to continuous integration/continuous deployment (CI/CD) pipelines and version control systems. This ensures that automated tests can be reliably triggered, tracked, and managed as part of the overall development lifecycle—all with minimal manual effort.

• Version Control Alignment:

  Many API testing solutions allow you to store test collections and configurations directly alongside your application’s source code, often in a human-readable format. This method not only makes collaboration easier but also provides maximum transparency and traceability. Version control systems like Git are commonly supported, enabling you to track changes, roll back to previous versions, and sync test suites effortlessly across team members.

• CI/CD Pipeline Integration:

  Automated API tests can be incorporated into popular CI/CD tools (such as Jenkins, GitHub Actions, or GitLab CI) with just a few tweaks. These integrations allow tests to run automatically whenever there’s a code change or a deployment, providing instant feedback on API health and preventing regressions before they reach production. Webhooks, command-line tools, and native plugins are frequently available to help configure these workflows without hassle.

• Collaboration and Reporting:

  Enhanced collaboration features ensure that test results are easily accessible to the entire team. Many tools synchronize with platforms like Slack, Microsoft Teams, or JIRA, so results and alerts are delivered directly to where your team communicates. This streamlines decision making and reduces bottlenecks.

• Customization and Security:

  Whether your team needs offline testing for maximum data privacy or prefers cloud-enabled collaboration, API testing platforms typically offer flexibility. Some tools operate entirely on the local filesystem for enhanced data control, while others offer secure cloud-based options, letting you pick what works best for your workflow.

With these capabilities, integrating API tests into your development and deployment pipelines becomes straightforward, bolstering both the efficiency and security of your software delivery process.

Supported Protocols and Request Types

When exploring API testing tools, it’s important to consider the range of protocols and request types they support. Depending on your project requirements, you might need a tool that goes beyond basic HTTP methods.

• Common Request Types:

  • Most modern solutions handle standard HTTP requests like GET, POST, PUT, DELETE, PATCH, and OPTIONS effortlessly. This enables you to work with anything from simple RESTful APIs to more complex scenarios.

• Protocol Support:

  • Some tools are tailored for REST and GraphQL, while others go further. For instance, Postman and Insomnia specialize in REST and GraphQL, yet several platforms also provide support for legacy and specialized protocols, including various forms of SOAP (1.1 and 1.2), raw socket connections, JMS (Java Messaging Service), AMF (Action Message Format), and JDBC (database connectivity).

  • In addition to HTTP and HTTPS, certain advanced testing suites accommodate secure connections and proprietary enterprise communications.

Choosing an API testing platform with the right protocols can save you time and ensure compatibility across your projects. Always check the documentation to confirm support for any less-common protocols you might need.