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Head-to-head · Infrastructure Policy as Code Tools

Open Policy Agent vs AWS CloudFormation Guard

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Open Policy Agent #3 in Infrastructure Policy as Code Tools 9.1/10 Open source ✓ 5 of 5 features Visit site
AWS CloudFormation Guard #6 in Infrastructure Policy as Code Tools 8.8/10 Open source ✓ 4 of 5 features Visit site

Open Policy Agent leads on 1 check, AWS CloudFormation Guard on 0, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreOpen Policy Agent · 9.1/10
  • Most featuresOpen Policy Agent · 5 of 5

Open Policy Agent scores higher on our rubric for infrastructure policy as code tools: 9.1 against 8.8 out of 10; our editors rank them #3 and #6.

Open Policy Agent offers runtime enforcement; AWS CloudFormation Guard doesn't.

Open Policy Agent is the better fit for teams building policy platforms. AWS CloudFormation Guard is the better fit for AWS policy validation teams.

  • Open Policy Agent fits best

    Teams building policy platforms

  • AWS CloudFormation Guard fits best

    AWS policy validation teams

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Side by side

Feature Open Policy Agent 9.1/10 Visit ↗ AWS CloudFormation Guard 8.8/10 Visit ↗
At a glance
Editor score 9.1 8.8
Ranking #3 in Infrastructure Policy as Code Tools #6 in Infrastructure Policy as Code Tools
Best for Teams building policy platforms AWS policy validation teams
Pricing model Free Free
Starting price Open source Open source
Free plan Not checked yet Not checked yet
Free trial — —
Deployment Self-hosted Self-hosted
Support Community, Docs Docs
Integrations 5 integrations 6 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Open Policy Agent 5/5 · AWS CloudFormation Guard 4/5
Policy testing ✓ ✓
Admission control ✓ ✓
Runtime enforcement ✓ (best) —
CI/CD integration ✓ ✓
Policy reporting ✓ ✓
Specs
Policy language Rego AWS CloudFormation Guard DSL
IaC formats Terraform plan JSON, JSON, YAML CloudFormation templates and change sets; Terraform JSON; Kubernetes configurations
Our review
Pros
  • Rego supports declarative policy authoring and reusable rules
  • Covers Kubernetes, Terraform, CI/CD, APIs, and Go integrations
  • Includes testing, decision logging, and policy/data bundle loading
  • 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 author policies in the Rego language
  • The supplied platform coverage is primarily API-based
  • Open-source delivery does not include paid hosted plans
  • Does not provide server-side runtime enforcement itself
  • Focused on structured JSON and YAML configuration checks
  • No AI-assisted policy features
Our verdict

Open Policy Agent (OPA) is an open-source, general-purpose policy engine that separates policy decisions from application logic. It is designed for teams building policy platforms across microservices, Kubernetes, CI/CD pipelines, API…

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 →
  1. Open Policy AgentInfrastructure Policy as Code Tools 9.1Open source
  2. AWS CloudFormation GuardInfrastructure Policy as Code Tools 8.8Open source

Strengths and trade-offs

  • Open Policy Agent — where it wins

    • Rego supports declarative policy authoring and reusable rules
    • Covers Kubernetes, Terraform, CI/CD, APIs, and Go integrations
    • Includes testing, decision logging, and policy/data bundle loading

    Where it doesn't

    • Requires teams to author policies in the Rego language
    • The supplied platform coverage is primarily API-based
    • Open-source delivery does not include paid hosted plans

  • 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
  • Open Policy Agent9.1/10 · Open source

    A broad, programmable policy engine for teams building policy platforms.

    Visit siteFull verdict →
  • AWS CloudFormation Guard8.8/10 · Open source

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

    Visit siteFull verdict →

More comparisons

All infrastructure policy as code tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update