Insomnia

Overview Insomnia is an open-source API development platform that supports REST, GraphQL, gRPC, SOAP, WebSockets, and SSE. It provides a single workspace for designing, debugging, testing, and mocking APIs using a collaborative, AI-native toolset. The platform is built for individual developers and enterprise teams who need to manage API lifecycles with security, compliance, and version control. It integrates natively with Kong Konnect and offers local, Git, or cloud storage options to fit different workflow and governance needs. Key Benefits Design APIs visually with OpenAPI specs using a design-first methodology with live preview. Generate API mocks with dynamic responses derived from collections, specs, or plain language descriptions. Run unlimited collection tests with pre- and post-request scripting for sophisticated workflows. Test MCP servers natively within Insomnia's client, inspecting tools, resources, and prompts. Sync data via Git (free for up to 3 projects on Essentials) or use native cloud sync with optional end-to-end encryption. Enforce storage policies across the organization mixing local-only, Git, or cloud storage to meet compliance requirements. How It Works After downloading the desktop client, you create a workspace and choose between Scratch Pad (local-only, no login) or a cloud-synced project. You send HTTP, gRPC, GraphQL, or WebSocket requests, organize them into collections, and add pre-request or after-response scripts for automated testing. You can connect a Git repository as the backend to version and manage all API assets, or push APIs through the Inso CLI to validate OpenAPI specs directly in your CI/CD pipelines. Use Cases API developers debug REST, GraphQL, gRPC, and WebSocket endpoints in a single desktop client without switching tools. DevOps engineers automate API testing and OpenAPI linting inside CI/CD pipelines using the Inso CLI. Platform teams enforce enterprise-wide storage policies, SSO, and SCIM provisioning across distributed teams. API designers preview OpenAPI specs in real time and generate mock servers for front-end parallel development. Security engineers test MCP servers, inspect authentication event logs, and validate edge cases before production deployment. Freelance developers version-control API collections via Git sync for free on the Essentials plan. Why Choose This Product Insomnia is best suited for API developers and organizations that want an open-source, collaborative platform with strong governance and security controls. It excels for teams already using or evaluating Kong Konnect, and for those who need flexible storage backends. The free Essentials tier covers core API debugging and design needs, while mock server requests are metered above 1,000 per month.