Top 5 Open-Source Alternatives to Aspen - API Testing for macOS

Aspen - API Testing for macOS

Blazing-fast API tester with AI helper & no login required!

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Product categories

API API Clients API Testing API Tools APIs Developer APIs Developer Tool Developer Tools REST Client Testing Tool

Summary

The top open-source alternatives to Aspen - API Testing for macOS are Postman, Axe API, and Insomnia REST. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Postman Landing Page
1

Postman

The Collaboration Platform for API Development
Pricing:
- Open Source
#API Tools #Developer Tools #APIs 30 social mentions
Axe API Landing Page
2

Axe API

The next-generation Rest API framework.
Pricing:
- Open Source
#API #API Tools #Developer Tools
Insomnia REST Landing Page
3

Insomnia REST

Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.
Pricing:
- Open Source
#API #API Tools #Developer Tools 129 social mentions
req Landing Page
4

req

A minimal yet powerful HTTP client/API testing tool.
Pricing:
- Open Source
#API Tools #Developer Tools #APIs
Step CI Landing Page
5

Step CI

API Testing and Monitoring made simple
Pricing:
- Open Source
#API #Developer Tools #Developer Tool 11 social mentions