Open source API client for REST, GraphQL, gRPC and WebSockets
Insomnia is an open source API client from Kong for designing and debugging REST, GraphQL, gRPC, WebSocket and server-sent event APIs. It supports collections, environments, scripting, test suites, mock servers, OpenAPI design and plugins. Projects can stay local, sync with Git or live in the cloud with end-to-end encryption, and paid plans add team collaboration and enterprise controls.
- features
- 6
- alternatives
- 6
- platforms
- 3
- Updated
- Oct 12, 2026
Features
Our take
Pros
- REST, GraphQL, gRPC, WebSocket and SSE requests in one client
- Projects can stay local or sync through Git instead of the cloud
- Built-in mock servers, test suites and OpenAPI design
Cons
- Team collaboration and enterprise controls require a paid plan
- Storage options (local, Git, cloud) changed across versions and can be confusing
Editorial assessment by the Alternatives.tools team, based on what the product is known for. Not a user review.
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RapidAPI for MacFreeNative macOS HTTP client for testing and describing APIs
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