Kong/insomnia

Insomnia is an open-source, cross-platform API client for GraphQL, REST, WebSockets, Server-Sent Events, and gRPC.

The tool addresses the need for a unified interface to interact with and test multiple API protocols. It combines debugging, design, testing, and mocking capabilities in a single application. Users can design APIs with a native OpenAPI editor, run test suites and collection runners, mock APIs using cloud or self-hosted servers, and build CI/CD pipelines through a native CLI. The application supports third-party plugins for extensibility.

Insomnia suits developers and teams working across multiple API types who want to avoid switching between specialized tools. The project distinguishes itself through flexible storage options: users can keep projects entirely local in a Vault, sync through Git repositories without cloud intermediaries, or use cloud storage with optional end-to-end encryption. Environments can be configured to remain local even when projects are stored in the cloud. The free tier includes a Scratch Pad for local-only work, while premium subscriptions unlock collaboration features, Git Sync, organizations, and enterprise authentication methods like SAML and OIDC. This approach lets teams choose storage independently for each project based on sensitivity and collaboration needs.

The project maintains active engagement with its user base, with nearly all open issues originating from external users rather than the core team, reflecting substantial real-world adoption. Maintainers typically respond to new issues and pull requests within a few days. Work in the issue tracker centers on bug reports and verification tasks, with the majority of activity labeled as bug-related or verification-status items.