The best alternatives to Mocky.io are Postman, Hoppscotch, and Stackprint. If these 3 options don't work for you, we've listed a few more alternatives below.
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Postman is the world’s leading API platform, used by more than 30 million developers and 500,000 organizations worldwide for building and managing APIs.
Postman enables teams to efficiently collaborate at every stage of the API lifecycle while prioritizing quality, performance, and security.
Stackprint is a web platform to quickly build REST APIs without having to write any code yourself. Define the resources that your API should manage and Stackprint deploys your REST API with one click.
Motty provides the simpler way to test your client services. It is an web application which gives you abaility to create your own custom responses. So you can intuitively and easily mock http responses. All you need to do is typing and click!