Insomnia

Insomnia is an API development and collaboration platform for designing, testing, and debugging APIs across multiple protocols including REST, GraphQL, gRPC, and WebSockets. It provides a clean interface for constructing requests, inspecting responses, and organising work into collections. Tests can be automated and run as part of CI pipelines, and API specifications can be mocked directly within the tool.

Projects can be stored locally, in a Git repository, or in the cloud, giving teams flexibility over how they manage and share API work. Role-based access controls and team workspaces support collaborative development, and AI-powered features assist with commit messages and smart suggestions. Insomnia also supports MCP client integration for AI agent workflows.

Insomnia is suited to API developers at all scales — from individual contributors using the free tier to enterprise teams at organisations like Netflix, PayPal, and Tesla who need a secure, extensible platform for managing complex API landscapes.