Terragrunt

What Terragrunt is

Terragrunt is an open-source infrastructure-as-code orchestration tool for running Terraform and OpenTofu at scale. It divides infrastructure into independently operated units and groups related units into stacks. Its Run Queue uses dependencies to order operations and allow concurrency where possible. Teams can define shared backend settings, provider configuration, module inputs, and environment conventions once for units to inherit. Terragrunt supports Terraform and OpenTofu across AWS, Google Cloud, Microsoft Azure, and other supported platforms; state management is self-hosted, and existing resources can be imported. The core tool is documented for Windows, macOS, and Linux. The Free plan costs nothing and covers up to 25 infrastructure units, unlimited runs, unlimited resources without RUM, and community support. Team costs $500 a month, billed with a listed 17% annual contract discount, and includes 200 units and standard support. Scale adds CI/CD pipelines, drift detection, and automated dependency updates for modules, units, and stacks. Its operations run in customers’ own CI runners and repositories, using OIDC for temporary least-privilege credentials.