RestCase is a security-focused API development platform that enables its users to rapidly create secure microservices, mock them in order to start testing, monitor APIs and collaborate on their development and testing.


API Astrolab is described as 'The API Astrolab enables today’s API-first companies to show their API products in a visual way so that anyone can understand how they work' and is a workflow automation tool in the office & productivity category. There are more than 25 alternatives to API Astrolab for a variety of platforms, including Mac, Windows, Linux, Web-based and SaaS apps. The best API Astrolab alternative is Postman, which is free. Other great apps like API Astrolab are Fiddler, soapUI, RapidAPI for Mac and Proxyman.
RestCase is a security-focused API development platform that enables its users to rapidly create secure microservices, mock them in order to start testing, monitor APIs and collaborate on their development and testing.


Runscope helps you monitor, log and measure API usage to solve API problems fast. Automatically monitor APIs without any coding. Runscope provides complete logging for all of your API traffic. Track down troublesome API calls with powerful search.



Thunder Client is a hand-crafted lightweight Http Client extension for Visual Studio Code. No separate download needed, Just install the extension from VS Code marketplace.


Kreya is a GUI client for gRPC, REST and WebSocket APIs with innovative features for environments, authorizations and more.




EchoAPI is an all-in-one API development collaboration platform that offers essential features like API debugging, design, automated testing, stress testing, and documentation generation.
Design and debug APIs in a powerful visual editor. Describe and debug easily with JSON Schema support. Apidog is a complete set of tools that connects the entire API lifecycle, helping R&D teams implement best practices for API Design-first development.




Api Open Studio allows you to quickly create and manage APIs with full business and processing logic and user management, using low-code. As a result, you can save important time and money by dedicating your resources on other tasks, while at the same time maintaining the...
ApiOpenStudio is the most popular Self-Hosted alternative to API Astrolab.
Postkit allows developers to quickly prototype API endpoints to use in their applications and websites. It’s great if you just need some JSON endpoints for your web app or to capture inputs from an HTML form.


Powerful IDE to work with API. Harness the power of scenarios, autocompletion and syntax highlight for API development. Write tests, share code without leaving the comfortable development environment.




Gotcha HTTP Client is a lightweight http client that allows you to make requests and inspect responses.




The apicurio studio project is a standalone, self-hostable, web-based API design studio that can be used to create new or edit existing API designs (using the OpenAPI specification).


Nokori is the all-in-one platform for building, hosting, and growing your SaaS business. From Instant Microservices, Auth-as-a-Service, and Transactional Email, we give tech brands the tools they need to bring ideas to life quickly and easily, while providing seamless...



