Postman is a collaboration platform for API development that supports automated testing, but its pricing and documentation can be complex. It has alternatives such as RapidAPI Testing, Paw, Apigee, Assertible, and Insomnia, which offer various features, pricing plans, and ease of use. RapidAPI Testing offers comprehensive testing with global monitoring and seamless integration, while Paw provides a native Mac GUI for test development and JavaScript extensions. Apigee integrates well in Google's cloud structure but has a split personality between X and Edge versions. Assertible has built-in assertions that don't require code, while Insomnia offers API testing and CI/CD integration using a command-line tool. The best tool for API testing depends on individual needs and factors such as pricing, ease of use, and features required.