1 Free and Open-source Web socket Apps for macOS (Intel and Apple Silicon)

Insomnia: API Testing and Designing App

Design, Test, and Develop REST APIs

Insomnia is a free open-source API designing, debugging, and testing app for multiple platforms including macOS.

It has a vast ecosystem that includes 350+ plugins, supports multiple protocols, and works with API file collections.

Read more about Insomnia: API Testing and Designing App features.