1. Integration Testing Tool: Mock/it is primarily an integration testing tool that focuses on simulating external dependencies like APIs, databases, or services to create controlled environments for testing, whereas Newman is a command-line collection runner for Postman, mainly used for running and testing APIs.
2. Dependency Simulation: Mock/it allows users to easily mock responses from external systems, aiding in the verification of system interactions without relying on actual external services, while Newman does not have this mocking capability and is more focused on running and monitoring API requests in a collection.
3. Scripting Language: Mock/it provides a scripting language for defining complex behavior of mocked services, giving users more control over the responses generated, whereas Newman primarily relies on the Postman collection format and does not offer a scripting language for custom behavior.
4. Stand-alone Tool vs. Part of a Suite: Mock/it is a stand-alone tool designed for mocking and testing external dependencies, offering flexibility in setting up simulated environments, while Newman is part of the Postman suite and is tailored for executing API requests within collections created in Postman.
5. Real-time Monitoring: Mock/it enables real-time monitoring and control over the behavior of simulated external services, providing instant feedback during testing, whereas Newman focuses more on running predefined API requests without the ability to dynamically alter the behavior of services during testing.

In Summary, the key differences between Mock/it and Newman lie in their focus on integration testing, dependency simulation capabilities, scripting language support, standalone versus suite integration, and real-time monitoring features.