1. Deployment Strategy: One key difference between Helm and Spinnaker is their approach to deployment strategy. Helm primarily focuses on package management and simplifies the process of installing, upgrading, and managing application dependencies in Kubernetes. On the other hand, Spinnaker provides a more sophisticated deployment strategy with support for multiple cloud providers, canary deployments, blue-green deployments, and more. While Helm is primarily centered around Kubernetes deployments, Spinnaker offers a broader range of deployment options.
2. Scalability: Helm is well-suited for managing small to medium-sized deployments, making it easier to manage applications within a single Kubernetes cluster. In contrast, Spinnaker is designed for large-scale deployments, with built-in features to manage complex multi-cluster, multi-cloud, and multi-region deployments. Spinnaker offers scalability and flexibility that Helm may lack when it comes to managing bigger and more complex deployment environments.
3. Rollback Mechanism: Helm provides a rollback mechanism that allows users to revert to previous versions in case of failures or issues with the current deployment. This feature is particularly useful when deploying complex applications, as it provides a safety net and ensures application availability. Spinnaker, on the other hand, offers a more comprehensive rollback mechanism by enabling users to roll back to previous versions and even rollback specific parts of the application using its built-in pipeline functionality.
4. Release Management: Helm provides a mechanism for versioning and managing releases, allowing users to track and manage different releases of their applications. It supports release management features like version upgrades, downgrades, and history tracking. Spinnaker, on the other hand, offers a more structured and sophisticated approach to release management, with built-in pipeline management, artifact management, and release orchestration capabilities, enabling users to manage complex release workflows across multiple environments and pipelines.
5. Extensibility and Integration: Helm provides a highly extensible platform through its plugin system and supports integration with various tools and platforms in the Kubernetes ecosystem. It allows users to extend Helm's functionality and integrate with external systems as needed. Spinnaker also offers extensibility through its plugin system, but it goes beyond Helm by providing extensive integrations with various cloud providers, CI/CD tools, and other systems, making it a more versatile and integrated solution for managing deployments across different environments.
6. User Interface: Helm primarily operates through a command-line interface (CLI) that requires users to write and execute commands to manage deployments. While Helm does provide a simple and straightforward CLI, it may require some learning curve for users not familiar with command-line tools. Spinnaker, on the other hand, offers a graphical user interface (GUI) that provides a more visual and intuitive way to manage deployments, pipelines, and other aspects of the application lifecycle. The GUI of Spinnaker makes it easier for users to visualize and interact with their deployments without the need for extensive command-line knowledge.

In Summary, Helm is primarily a Kubernetes package manager with focus on package management and simplified deployments, while Spinnaker is a more feature-rich deployment tool that supports a broader range of deployment strategies, scalability for large-scale deployments, comprehensive rollback and release management mechanisms, extensive extensibility and integration options, and a graphical user interface for ease of use.