They are quite different.

- Ansible is a standalone tool with a very broad scope ("automation for everyone").

- InfraKit is an embeddable component with a very narrow scope ("create and manage declarative, self-healing infrastructure").

If Ansible were written today, it could probably embed InfraKit to implement low-level infrastructure management.

Reminds me of packer, after first glance, the whole 'working with azure/aws' aspect. So I'd be curious how it differs there.