Insomnia is an open-source API client and design platform for REST, GraphQL, gRPC, and SOAP APIs. Developers use it to design, debug, test, and document APIs — positioning as a more design-focused alternative to Postman with built-in spec editing and mock servers.
Excellent API testing and design. Support for REST, GraphQL, gRPC in one client. Design-first workflow with spec editing is well-implemented.
Cleaner, more focused UI than Postman. Less cluttered interface that many developers prefer for focused API work.
Git sync for request collections. Integrates with Kong Gateway. Fewer enterprise integrations than Postman.
Free and open-source for individuals. Teams plan at $12/user/mo. Significantly more affordable than Postman at scale.
AI-powered request generation and test generation in newer versions. Not yet a differentiator.
Active open-source community and GitHub. Owned by Kong — good enterprise backing.
Enterprise plan with SSO, audit logs, and enterprise support. Works well for team-scale API testing.