Insomnia is an open-source, cross-platform API client for GraphQL, REST,
WebSockets, Server-sent events (SSE), gRPC and any other HTTP compatible
protocol.

With Insomnia you can:

• Debug APIs using the most popular protocols and formats.
• Design APIs using the native OpenAPI editor and visual preview.
• Test APIs using native test suites.
• Mock APIs will be coming soon in November 2023.
• Build CI/CD pipelines using the native Insomnia CLI for linting and testing.
• 
  Collaborate with others using the many collaboration features to share
  your projects.
  

And a lot more! The following storage options are supported for your
projects, collections, specs and all other files:

• 
  Local Vault: for local storage of collections, design specs and every
  other resource.
  
• Cloud Sync: for cloud collaboration, encrypted and free.
• Git Sync: for Git storage of all files using any 3rd party Git repository.