OpenCost and Kubecost share the same allocation engine — Kubecost is built on top of OpenCost. OpenCost is free, Apache 2.0 licensed, and a CNCF Incubating project, making it ideal for single-cluster teams with existing Prometheus infrastructure. Kubecost Business ($449/month) adds multi-cluster views, budget alerts, and billing reconciliation against actual cloud discounts, making it worthwhile for multi-cluster FinOps teams. Kubecost Enterprise adds SSO, RBAC, and air-gapped deployment, though IBM's 2024 acquisition has raised enterprise pricing. Neither tool automates cost reduction — both are visibility layers only. Key differentiators include data retention (OpenCost is Prometheus-controlled vs. Kubecost Free's 15-day hard cap), native budget alerts (Kubecost Business only), and billing reconciliation (Kubecost Business reconciles against actual cloud billing, while OpenCost defaults to list pricing). For teams wanting autonomous cost reduction beyond visibility, Cast AI is positioned as the execution layer.
