HTTP client + AI tool for automated API development

Test APIs locally within a super-optimized native Mac App and speed up API integrations, generate data model and OAS with the help of our AI assistant. No login required.

What is 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 tests. 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, Open API Specs and generating integration code.

Aspen Collections

The new Collections feature in Aspen helps you organize, import, export, and share API requests for better teamwork and reuse. Easily bring in files from tools like Postman or export your own with just a few clicks, simplifying API workflows and enhancing collaboration.

Why Choose Aspen?

Automate your API development

Zero Trust Policy
There is no login required to start using Aspen. It doesn’t save any data and all operations are performed locally.
AI Assisted
Use the already integrated Alfred AI to generate data models, OAS and integration code in seconds.
Search and Teamwork
You can easily search through locally stored history and share tests with third parties through an expiring link.

Watch Aspen’s API testing and AI capabilities in action

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Made For API First Teams

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Download Aspen

The ultimate free API testing tool for
macOS with AI Integration

Native macOS app

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Private by default
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AI-powered
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Blazing fast