aspen-api-testing-for-macos
Aspen is a free, native macOS API-testing app that runs locally with no login required and includes an integrated AI assistant to speed API integrations by generating data models, OpenAPI specs, and integration code.
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aspen-api-testing-for-macos
Aspen is a native macOS application for testing REST APIs that runs entirely on the local machine with a zero-trust approach — no login and no saved data. It is provided free of charge and is designed for developers working on API design and integrations. The app includes an integrated AI assistant (called Alfred) that helps generate Data Models, OpenAPI specifications, and integration code to accelerate development.
Aspen also includes collaboration features called Collections to organize, import, export, and share API requests (including import from tools like Postman). The product is developed and published by Treblle and is positioned as a lightweight, privacy-focused alternative for local API testing on macOS.
Free macOS API testing app with AI integration, focused on REST APIs and data security.
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Native macOS App
A super-optimized native application for macOS that allows local API testing and runs without requiring a login.
Zero Trust / Local-only
No data is saved externally and all operations are performed locally on the machine to ensure higher data security.
Integrated AI Assistant (Alfred)
An AI companion that helps run tests faster and generates integration code, OpenAPI specs, and data models to accelerate API integrations.
Fast Local Testing
Enter parameters and get API test results in less than a second (as described on the site).
Collections for Collaboration
Organize, import, export, and share API requests to streamline teamwork and reuse.
Import/Export Compatibility
Import files from tools like Postman and export requests for reuse and sharing.
Focus on REST APIs
Specifically designed and optimized for testing REST APIs.
Pricing
Aspen is free to use; the app requires no login and is described on the site as a free API-testing native app for macOS.
Free
Free- Native macOS app for API testing
- Integrated AI assistant
- Local-only operations with no login required
- Collections and import/export features
Use Cases
Local REST API Testing
Run and validate REST API endpoints locally on macOS without sending data to external services.
Accelerating Integrations
Use the AI assistant to generate OpenAPI specs, data models, and integration code to speed up integration work.
Collaborative Request Sharing
Organize and share sets of API requests with team members using Collections and import/export functionality (including Postman imports).
Secure Development Environments
Test APIs in environments that require no cloud storage or account, meeting privacy and compliance needs.
Integrations
Postman (import)
Import files from tools like Postman to reuse and share API requests.
Treblle platform
Aspen is developed by Treblle and the site notes access to Treblle products (API Observability, Analytics, Governance, Autogenerated Docs, A(p)I Assistant) via the Treblle platform.
Benefits
Limitations
Frequently Asked Questions
Is Aspen Free?
Why would I use Aspen and not Postman or Insomnia?
Getting Started
- 1 Download the Aspen Mac app from the site.
- 2 Launch the app on macOS — no account or login required.
- 3 Enter the API endpoint and parameters you want to test and run the request to see results.
- 4 Use the AI Companion (Alfred) to generate OpenAPI specs, data models, or integration code as needed.
- 5 Create or import Collections to organize and share requests (import from Postman if desired).
Support
Site footer references 'Email your Feedback' to contact the project (no explicit address provided on the page).
Blog / Announcements
Announcement blog post linked from the site (e.g., Collections feature announcement) for product updates and details.
Download
Direct download link for the Mac app on the site to try the product.
API
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