Kargo vs Knative

Kargo is an open-source continuous promotion orchestration layer for moving applications through deployment stages in Kubernetes environments. It complements Argo CD, with customizable pipelines for advancing changes from one environment to another and a view of changes across environments. Kargo tracks updates from Git artifacts, container images, Helm charts, and other artifacts. Verification checks can run at stages before an artifact advances downstream. Documented promotion steps include Git operations, Helm, Kustomize, Argo CD, and HTTP requests to external services. Kargo Enterprise additionally lists Jira, ServiceNow, JFrog Evidence, GitHub Actions, and Slack or email notifications, and can automatically return a stage to its last stable artifact when verification fails. The open-source distribution uses the Apache 2.0 license. A basic installation requires a Kubernetes cluster, and the documentation says Kargo works best paired with Argo CD. Its default configuration is suitable only for trying it in a local cluster that is not internet-facing. The open-source distribution has no time- or severity-bound backport guarantee for security fixes. Akuity Pro, including one Kargo instance, is listed at $495 a month; Enterprise pricing is available by contacting sales.

Knative is open-source Kubernetes middleware for building, deploying, and managing serverless workloads. Knative Serving handles stateless HTTP services, including deployment, routing, and automatic scaling. Services can scale from zero when idle and rise again with incoming traffic. Serving also supports blue-green deployments, canary releases, and traffic splitting between revisions. Knative Eventing routes asynchronous events through CloudEvents over HTTP. Knative Functions provides a framework for packaging stateless functions as containers. Installation can use a local quickstart or a production setup on an existing Kubernetes cluster with YAML or the Knative Operator. The project runs on Kubernetes across cloud providers and on-premises environments, with Linux, macOS, and Windows listed for installation. Integrations include Istio, Contour, Gateway API, Kafka, RabbitMQ, and NATS. The open-source plan is free, with self-managed Kubernetes deployment.