1. Deployment Strategy: One key difference between Skaffold and Spinnaker is the deployment strategy they employ. Skaffold is mainly focused on providing a fast and efficient workflow for developing applications locally and deploying them to Kubernetes. In contrast, Spinnaker is a more comprehensive continuous delivery platform that facilitates complex deployment pipelines across multiple cloud platforms, not just limited to Kubernetes.

2. Scope of Automation: Skaffold is designed to automate the process of building container images and deploying applications to Kubernetes clusters. On the other hand, Spinnaker offers a wider range of automation capabilities, including the management of application releases, rollbacks, canary deployments, automated quality gates, and multi-cloud deployment strategies.

3. Community Support and Integration: Skaffold has gained popularity within the Kubernetes community for its simplicity and ease of use. It has strong integration with tools like Docker and Kubernetes, making it a preferred choice for developers working in Kubernetes environments. Meanwhile, Spinnaker has a more robust community support and integration with a variety of cloud providers, enabling seamless deployment across different cloud environments.

4. User Interface and Visualization: Another significant difference is in the user interface and visualization features offered by Skaffold and Spinnaker. Skaffold primarily operates through the command line interface, providing quick feedback on build and deployment processes. In contrast, Spinnaker offers a rich graphical user interface that enables users to visualize and manage the entire deployment pipeline, making it easier to track and analyze the deployment process.

5. Flexibility and Extensibility: Skaffold is known for its simplicity and lightweight nature, focusing on the core tasks of building and deploying applications with Kubernetes. While it may lack some advanced features, it allows for easy integration with other tools and workflows. Spinnaker, on the other hand, provides a more comprehensive platform with advanced deployment strategies and extensibility options, catering to complex deployment scenarios and enterprise-level requirements.

6. Security and Compliance: Spinnaker places a strong emphasis on security and compliance features, offering capabilities such as RBAC (Role-Based Access Control), audit trails, and integration with security tools for vulnerability scanning and policy enforcement. In comparison, Skaffold is more limited in terms of built-in security features, making it more suitable for smaller-scale or less sensitive projects.

In Summary, Skaffold is a lightweight deployment tool focused on local development to Kubernetes, whereas Spinnaker is a comprehensive continuous delivery platform with broader automation and deployment capabilities across multiple cloud environments.