AWS Controllers for Kubernetes vs Terramate

AWS Controllers for Kubernetes (ACK) lets Kubernetes users define AWS resources with Kubernetes custom resources. It periodically compares desired and actual AWS state and corrects drift. Documentation lists 74 service controllers, including S3, RDS, Lambda and DynamoDB. ACK supports declarative, version-controlled infrastructure alongside applications, across AWS accounts and regions. Read-only resources and read-only adoption support migration from other infrastructure-as-code tools. EKS users can install managed EKS Capabilities, where AWS handles controller installation and upgrades with automatic updates, auto-scaling and auto-tuning. Self-managed Helm installation runs on EKS, GKE, AKS, on-premises clusters and local environments, providing version and configuration control. AWS IAM authorizes controller access. Self-managed ACK costs nothing for Helm installation on Kubernetes 1.20+ on any Kubernetes cluster. EKS Capability pricing is hourly, with a base rate per enabled capability plus usage charges for each ACK resource managed.

Terramate is an Infrastructure as Code orchestration and observability platform for platform teams. It helps teams package reusable infrastructure patterns so developers and AI agents can self-serve across environments. Terramate Cloud lists Terraform, OpenTofu, and Terragrunt as supported tools. Its capabilities include stacks, orchestration, custom workflows, rendered pull request plan previews, GitOps, drift detection, and drift reconciliation. Integrations include GitHub Actions, GitLab CI/CD, Bitbucket Pipelines, and Azure DevOps, and pull request integration is documented for GitHub, GitLab, Bitbucket, and other VCS platforms. Terramate says it does not need access to customer cloud accounts, state files, or source code; the CLI removes sensitive values from plan data before syncing it to the cloud. It lists AES-256 encryption at rest and HTTPS with TLS 1.2 for communications. Supported clouds are AWS, Google Cloud, and Azure. State management is self-hosted. Community is free for up to 2 users and 1,000 resources; Teams costs $449 a month and supports unlimited users and up to 5,000 resources. Enterprise pricing is custom.