Cloud Custodian vs AWS CloudFormation Guard

Cloud Custodian9.0Visit ACAWS CloudFormation Guard8.8Visit

Higher score Cloud Custodian #4 in Infrastructure Policy as Code Tools 9.0/10 Free plan Free plan✓ 5 of 5 features Try Cloud Custodian

vs

AC AWS CloudFormation Guard #6 in Infrastructure Policy as Code Tools 8.8/10 Open source ✓ 4 of 5 features Visit site

• Cloud Custodian fits best

  Multi-cloud remediation teams

• AWS CloudFormation Guard fits best

  AWS policy validation teams

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Side by side

Feature	Cloud Custodian 9.0/10 Visit ↗	ACAWS CloudFormation Guard 8.8/10 Visit ↗
At a glance
Editor score	9.0	8.8
Ranking	#4 in Infrastructure Policy as Code Tools	#6 in Infrastructure Policy as Code Tools
Best for	Multi-cloud remediation teams	AWS policy validation teams
Pricing model	Free	Free
Starting price	Free plan	Open source
Free plan	✓ (best)	Not checked yet
Free trial	—	—
Deployment	Cloud, Self-hosted	Self-hosted
Platforms	Windows, macOS, Linux	Windows, macOS, Linux
Support	Community, Docs	Docs
Integrations	4 integrations	6 integrations
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Cloud Custodian 5/5 · AWS CloudFormation Guard 4/5
Policy testing	✓	✓
Admission control	✓	✓
Runtime enforcement	✓ (best)	—
CI/CD integration	✓	✓
Policy reporting	✓	✓
Specs
Policy language	YAML	AWS CloudFormation Guard DSL
IaC formats	Terraform	CloudFormation templates and change sets; Terraform JSON; Kubernetes configurations
Our review
Pros	Supports AWS, Azure, Google Cloud, and Oracle Cloud Infrastructure Combines YAML policies, dry runs, enforcement, remediation, and reporting Evaluates Terraform infrastructure as code in CI with c7n-left	Dedicated Guard DSL with built-in rule unit testing Checks CloudFormation, Terraform JSON, and Kubernetes configurations CI outputs plus CloudFormation Hooks for blocking or warning
Cons	Requires teams to manage and operate the open-source deployment CI admission-style enforcement is not a standalone deployment admission controller Policy reporting is limited to CSV and text-based outputs	Does not provide server-side runtime enforcement itself Focused on structured JSON and YAML configuration checks No AI-assisted policy features
Our verdict	Cloud Custodian is an open-source rules engine for managing public-cloud resources and accounts. It is designed for teams that need one policy workflow across AWS, Microsoft Azure, Google Cloud Platform, and Oracle Cloud Infrastructure.… Read the review →	AWS CloudFormation Guard is an open-source command-line policy-as-code tool for teams that need to evaluate infrastructure and configuration data against defined rules. Its Guard domain-specific language supports validation of structured… Read the review →

Strengths and trade-offs

• Cloud Custodian — where it wins

  • Supports AWS, Azure, Google Cloud, and Oracle Cloud Infrastructure
  • Combines YAML policies, dry runs, enforcement, remediation, and reporting
  • Evaluates Terraform infrastructure as code in CI with c7n-left

  Where it doesn't

  • Requires teams to manage and operate the open-source deployment
  • CI admission-style enforcement is not a standalone deployment admission controller
  • Policy reporting is limited to CSV and text-based outputs

• AWS CloudFormation Guard — where it wins

  • Dedicated Guard DSL with built-in rule unit testing
  • Checks CloudFormation, Terraform JSON, and Kubernetes configurations
  • CI outputs plus CloudFormation Hooks for blocking or warning

  Where it doesn't

  • Does not provide server-side runtime enforcement itself
  • Focused on structured JSON and YAML configuration checks
  • No AI-assisted policy features

• Cloud Custodian9.0/10 · Free plan

  A broad, open-source policy engine for teams managing cloud compliance and remediation.

  Try Cloud CustodianFull verdict →
• ACAWS CloudFormation Guard8.8/10 · Open source

  A focused, open-source validator for AWS and multi-format infrastructure policy checks.

  Visit siteFull verdict →