Insomnia
Freemium
An open-source API client for REST, GraphQL, gRPC and more, with AI help from Kong.
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Postman
The API platform for building, testing and documenting APIs, with an AI assistant called Postbot.
About Postman
Postman is the tool many developers reach for when they need to send a request to an API and see what comes back. Over the years it has grown into a full platform for designing APIs, writing tests, mocking servers and sharing collections with a team.
Its AI assistant, Postbot, helps write test scripts, explain responses, generate documentation and suggest what to try next. Newer features also help teams build and test AI agents and connect to MCP servers.
Postman has a free plan and paid team and enterprise plans. It is a safe default for anyone who works with APIs regularly.
Standout features
- API request builder
- Automated testing
- Mock servers
- Postbot AI assistant
- Shared collections
- API documentation
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