Question: Can you recommend a free API testing tool that can save me time and effort?

If you're looking for a free API testing tool that'll save you time and hassle, Aspen is worth a look. It's a user-friendly tool for macOS that's geared for REST APIs. Aspen comes with an integrated AI assistant, Alfred, that can create data models, Open API Specs and integration code to get you started with API testing. It supports parameterized testing and doesn't store any data, so you don't have to worry about security.

Another good choice is Kusho, an AI agent that automates API testing by converting API specifications into a full suite of tests. Kusho can convert Postman collections, OpenAPI specs or cURL commands into a full suite of tests. It also offers real-time reporting with AI analyzed test results, making it a good choice for developers and testing teams looking to automate their API testing without manual intervention.

If you want a suite of tools, check out ReAPI. The platform includes a visual OpenAPI-based API designer, a no-code test case designer and detailed test reports. It also can automate API documentation and includes built-in debugging tools, so developers can focus on building good APIs instead of just getting them to work. ReAPI is geared for teams working on API development and testing.

Also worth a look is Conektto, which offers a free version that includes tools for API design, simulation and testing. With tools like the API Test Harness for automating testing and mocking, Conektto is good for product managers, architects, developers, testers and DevOps teams. Its Community Edition is free forever, so it's a good choice if you're looking for a low-cost way to handle your API development and testing needs.