API testing is crucial in software development, ensuring smooth app communication. For Mac users in 2025, having the right tool boosts workflow. Here’s a look at the top 20 API testing tools, highlighting features, pricing, and advantages for various testing needs.

1. EchoAPI

EchoAPI is a killer alternative to Postman and stands out as an ultra-lightweight, no-login-required collaboration tool for API development. It’s perfect for API design, debugging, automated testing, and load testing. Plus, it comes with handy plugins for IntelliJ IDEA, VS Code, and a Chrome request capture extension.

Key Features of EchoAPI:

• No login required: Start immediately without account hassles.
• Supports Scratch Pad: Ideal for quick notes and test configurations.
• Ultra Lightweight: Fast and efficient.
• 100% Postman Script Compatibility: Switch from Postman without missing a beat.

2. Postman

Postman is an all-in-one API development environment used by millions. It simplifies building, testing, and monitoring APIs while being super user-friendly.

Key Features:

• Automated testing
• API monitoring
• Collaboration tools
• Mock servers

Pricing: Free plan; Pro plan starts at $14/user/month.

3. Paw

Paw is a powerful HTTP client for macOS, known for advanced scripting and a sleek interface. It’s great for developers needing powerful API tools.

Key Features:

• JavaScript scripting
• Dynamic values
• SSL client certificate support

Pricing: Free; Paid plan starts at $10/user/month.

4. Insomnia

Insomnia offers a clean, organized interface supporting multiple protocols. It’s great for simplicity and robust functionality.

Key Features:

• REST, GraphQL, and gRPC support
• Environment management
• Plugin support

Pricing: Free; Paid plan starts at $5/user/month.

5. SoapUI

SoapUI is a comprehensive tool for testing SOAP and REST APIs, packed with features for thorough testing.

Key Features:

• Functional and security testing
• Load testing
• Data-driven testing

Pricing: Open-source version available; Paid version starts at $985/year.

6. Katalon Studio

Katalon Studio supports API, web, and mobile testing with an intuitive interface. It’s great for those who don’t want to dive deep into programming.

Key Features:

• Simple syntax
• Mock server support
• CI/CD integration

Pricing: Free; Paid plan starts at $175/user/month.

7. JMeter

Apache JMeter is an open-source tool for performance and load testing, also great for API testing.

Key Features:

• Load and performance testing
• Extensive plugin support

Pricing: Free and open-source.

8. Newman

Newman is a CLI tool for running Postman collections, ideal for automation.

Key Features:

• CLI-based testing
• CI/CD integration

Pricing: Free and open-source.

9. Restlet Client

Restlet Client is a straightforward tool for efficient API testing and development.

Key Features:

• Automated testing
• API monitoring

Pricing: Free; Pro plan starts at $9/user/month.

10. TestMace

TestMace offers a focus on automation and productivity in API testing.

Key Features:

• Automated testing
• CI/CD integration

Pricing: Free; Pro plan starts at $4/user/month.

11. Assertible

Assertible is all about automated API testing and monitoring.

Key Features:

• Automated testing
• API monitoring

Pricing: Free; Pro plan starts at $25/user/month.

12. Airborne

Airborne is designed for Ruby developers, offering a simple syntax for API testing.

Key Features:

• Ruby-based testing
• Integration with RSpec

Pricing: Free and open-source.

13. Swagger Inspector

Swagger Inspector is great for testing and validating APIs, integrating well with the Swagger ecosystem.

Key Features:

• API validation
• Swagger documentation integration

Pricing: Contact for pricing.

14. Citrus

Citrus is powerful for testing messaging interfaces and APIs across multiple protocols.

Key Features:

• Multiple protocol support
• Automated testing

Pricing: Free and open-source.

15. API Fortress

API Fortress is a strong platform for continuous API testing and monitoring.

Key Features:

• Continuous testing
• Detailed analytics

Pricing: Contact for pricing.

16. Pyresttest

Pyresttest is for Python developers, offering simple but powerful API testing capabilities.

Key Features:

• Automated testing
• YAML-based test definitions

Pricing: Free and open-source.

17. Karate DSL

Karate DSL combines API and performance testing with mock support.

Key Features:

• Simple syntax
• API and performance testing

Pricing: Free and open-source.

18. HttpMaster

HttpMaster focuses on web service and API testing with detailed features.

Key Features:

• Automated testing
• Performance testing

Pricing: Free; Pro plan starts at $99/year.

19. HTTPie

HTTPie is a command-line tool making HTTP requests simple and friendly.

Key Features:

• Clean syntax
• Colorized output
• Plugin support

Pricing: Free; Pro plan starts at $10/month.

20. Mocha

Mocha is a JavaScript framework for powerful API tests, running on Node.js and in the browser.

Key Features:

• Flexible and extendable
• Simple asynchronous testing

Pricing: Free and open-source.

Final Word

API testing is essential for keeping apps running smoothly. For Mac users, the top tools of 2025 offer a range of features to suit different needs. Whether you’re working solo or part of a team, there’s a tool out there for you.

EchoAPI shines without needing a login, while Postman remains a comprehensive favorite. Paw offers advanced macOS features, and JMeter is great for performance testing. Open-source options like Newman and Karate DSL provide cost-effective solutions, and tools like API Fortress ensure continuous reliability.

Pick a tool that matches your requirements, team size, and budget. The right API testing tool can transform your development process, enhance application quality, and deliver a better user experience.