CAST AI is a fully autonomous cloud cost optimization platform that supports Kubernetes clusters running on AWS, Google Cloud Platform, and Microsoft Azure Cloud. It uses multiple mechanisms to reduce cloud bills, including automated analysis of cloud resources, automatic rebalancing of the cluster to achieve optimal configuration, and continuous optimization strategies that engage Day 2 Ops tactics to ensure ongoing efficiency. The platform achieves this without requiring active involvement from DevOps or cloud engineers, instead using a combination of automation and AI-driven decision-making to optimize cloud costs and performance.