Infracost bridges the gap between infrastructure-as-code and cost management by providing real-time cost feedback in the developer workflow. When a developer opens a pull request that modifies Terraform, Terragrunt, CloudFormation, or AWS CDK files, Infracost calculates the monthly cost impact of those changes and posts a formatted comment showing what will increase, decrease, or stay the same. This shifts cost awareness from monthly billing surprises to the point where infrastructure decisions are actually made.
The tool parses supported IaC definitions and plan output to understand resource configurations, then maps them against cloud provider pricing APIs for accurate estimates. It supports over 1,000 resource types across AWS, Azure, and GCP, including complex pricing models like reserved instances, tiered storage, and data transfer. Usage-based costs can be estimated by providing expected usage patterns in a simple YAML file alongside your infrastructure code.
Infracost is Apache 2.0 licensed with 12.4K+ GitHub stars and 77+ contributors. The CLI runs locally or in CI/CD, with official integrations for GitHub Actions, GitLab CI, Jenkins, CircleCI, and Atlantis. The cloud dashboard (free for small teams) provides cost trending, team-level visibility, and budget alerts. For FinOps teams, Infracost provides the developer-facing cost feedback that complements monitoring tools like Kubecost or AWS Cost Explorer.
