Aspen

Aspen is a free API-testing native app for macOS. Built with ZERO trust in mind, there is no login required to run API test. It is specifically made to meet the needs of testing REST APIs, and with the help of AI, instantly help with integrations by generating data models, OpenAPI Specs and generating integration code.

Aspen is completely free. Simply put in the parameters you want to test and get results in less than a second. Use the AI Companion Alfred to speed up integrations and development.

With the new Collections feature in Aspen, you can easily organize, import, export, and share API requests to streamline teamwork and reuse. Import files from tools like Postman or export your own in just a few clicks, making API workflows faster and more collaborative than ever.

Is Aspen Free?Yes. Aspen is a free API testing tool made to help out developers who work on API design and API integrations.

Use cases

• Test REST APIs locally on macOS
• Generate OpenAPI Specifications and data models
• Collaborate on API requests with collections