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.
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