Altair GraphQL Client vs Scalar

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.

Scalar is Open-source API documentation and testing platform that generates modern interactive docs from OpenAPI specs.. It is available under a freemium model. This tool falls under the api tools category.