Insomnia

Insomnia, by Kong, is a developer-focused API client for designing, testing, and debugging APIs. Developers build and send requests across REST, GraphQL, gRPC, WebSocket, and Server-Sent Events, organize them into collections and environments, and inspect responses in a clean, fast interface. Known for being lightweight and keyboard-friendly compared to heavier tools, Insomnia is a popular choice for developers who want a focused API workspace without bloat, and it works well as an open-source-friendly alternative to Postman.

Beyond ad-hoc requests, Insomnia supports the API lifecycle. It includes API design (OpenAPI spec editing), environment variables and chaining, pre-request scripts and test assertions, code generation, and Git Sync so API collections live in version control alongside code. As part of Kong's API platform, it connects to Kong's broader API gateway and management ecosystem, and it offers a storage model that can keep data local, in Git, or in the cloud, appealing to teams with security or workflow preferences.

Insomnia serves individual developers and engineering teams building and testing APIs. Pricing is per user per month: a Free tier for up to about 3 users (unlimited projects, limited Git Sync and mock requests), a Pro plan around $12 per user (unlimited Git Sync, RBAC, more mock requests), and an Enterprise plan around $45 per user (SSO/SCIM, domain capture, vault integrations), with annual discounts. It competes with Postman, Hoppscotch, Bruno, and Paw, differentiating on a lean interface, multi-protocol support, and Git-based collaboration.