Altair GraphQL Client vs Mockoon

Altair GraphQL Client is an open-source GraphQL IDE for sending queries, mutations, and subscriptions to GraphQL APIs. It provides features like query autocompletion, schema documentation browsing, environment variables, and request collections. The client is available as a desktop application, browser extension, and web app.

Mockoon is desktop and CLI tool for creating mock REST APIs locally without configuration or remote deployment. It provides comprehensive features for api-tools workflows. The tool is actively maintained with regular updates and strong community/vendor support.