1. Syntax: InSpec is a testing and compliance tool that uses Ruby-based language for writing tests, while Moq is a mocking framework for .NET that allows developers to create and use mocks in C#.
2. Purpose: InSpec focuses on ensuring the compliance and security of infrastructure by writing tests that verify the state of systems, whereas Moq is primarily used for testing components, such as classes and methods, in isolation.
3. Integration: InSpec is often integrated with configuration management tools like Chef, Puppet, and Ansible for infrastructure testing and compliance, while Moq is utilized in unit testing scenarios where mocks are needed to isolate specific components.
4. Mocking capabilities: Moq provides dynamic mocking capabilities, allowing developers to set expectations on mocked objects and verify interactions, whereas InSpec focuses on defining and running tests against infrastructure to ensure compliance.
5. Community support: InSpec is supported by a wider range of community contributors within the DevOps and compliance space, while Moq has a strong community within the .NET development community.
6. Domain-specific focus: InSpec is tailored towards infrastructure testing and compliance, enabling users to write tests specific to infrastructure requirements, while Moq is more focused on the testing of individual components within software applications.

In Summary, the key differences between InSpec and Moq lie in their syntax, purpose, integration with tools, mocking capabilities, community support, and domain-specific focus.