Insomnia

Insomnia is an open-source API client developed by Kong that supports REST, GraphQL, gRPC, and WebSocket protocols, providing developers with a focused environment for designing, testing, debugging, and documenting APIs. It offers a clean alternative to heavier API platforms while maintaining the core features that developers need for day-to-day API work. Insomnia's interface prioritizes clarity and efficiency. The request editor supports multiple body types, authentication methods (including OAuth 2.0, Bearer tokens, and API keys), and environment variables that can be scoped to workspaces or folders. Request chaining allows developers to extract values from one response and use them in subsequent requests, which is essential for testing multi-step API workflows. Environment management supports multiple configurations such as development, staging, and production with easy switching between them. GraphQL support includes schema fetching, auto-completion, and query variable management, making it one of the stronger GraphQL clients available. gRPC support with reflection and server streaming rounds out the protocol coverage. Insomnia also includes an OpenAPI designer and linter for creating and validating API specifications, and a code generation feature that produces request code in multiple programming languages. Insomnia is best suited for backend developers, API engineers, and full-stack developers who need a focused API testing tool without the feature sprawl of larger platforms. Developers who work with GraphQL or gRPC APIs will find Insomnia's protocol support particularly strong compared to alternatives. Teams that value keeping their API collections in version control benefit from Insomnia's Git sync feature, which stores collections as files that can be committed, branched, and merged alongside application code. Insomnia's core application is free and open-source. The paid plans, starting at $5 per user per month for the Individual tier, add cloud sync, encrypted storage, and collaboration features. The Team and Enterprise plans add centralized control, SSO, and organization management. It is worth noting that Insomnia's licensing and feature distribution have changed several times as Kong has adjusted its strategy, so teams should verify current terms before committing. For developers who find Postman too bloated and want a cleaner, more developer-centric API testing experience, Insomnia remains a strong option.