AWS Billing and Cost Management vs Infracost

AWS Billing and Cost Management helps organizations handle AWS invoices and review, organize, forecast, and manage cloud costs. The Bills page provides downloadable invoices and detailed monthly billing data. Cost Explorer visualizes costs and usage over time, with filters and groupings such as account and service, and projects future costs from historical and current patterns. AWS Budgets can alert users when spending or usage thresholds are crossed or forecast to be crossed, and track Reservations and Savings Plans utilization and coverage. Cost Anomaly Detection identifies unusual spending and possible causes, with alerts sent individually or in daily or weekly summaries by SNS or email. Cost Categories sorts cost and usage data into customer-defined groupings and can be used with Cost Explorer, AWS Budgets, and the Cost and Usage Report. The service is listed at free, but some features have usage charges. Cost Explorer API requests cost $0.01 per primary billing view request or $0.01 per source for custom billing view requests. Hourly granularity has a 14-day lookback and applies to specified cost and usage data.

Infracost brings cloud cost estimates and FinOps guidance into infrastructure-as-code workflows, helping teams find cost issues before deployment. It supports Terraform, CloudFormation, and AWS CDK projects across AWS, Azure, and Google Cloud. Infracost Cloud tracks more than 10 million price points and presents estimates and FinOps guidance in pull requests and IDEs. Its CI/CD integration can comment on cost differences, policy violations, and tagging issues introduced by a change. Cloud also offers custom guardrails, price books, and tagging policies; Issue Explorer can identify optimization opportunities and open pull requests with fixes. Infracost AI combines provider billing, subscriptions, gateway logs, and agent telemetry to reconcile spend and build what-if scenarios for models and routing strategies. The free CI/CD plan includes 1,000 runs per month. Starter costs $250 a month and includes 10,000 runs per month and email support. Estimates from Terraform HCL alone may not resolve values only known at plan time; Terraform plan JSON is recommended for those cases.