# cfn-nag vs Start Left® IaC Security: side-by-side comparison (2026)

[cfn-nag](https://cybersectools.com/tools/cfn-nag) is a free [static application security testing](https://cybersectools.com/categories/sast) solution. [Start Left® IaC Security](https://cybersectools.com/tools/start-leftr-iac-security) is a commercial [static application security testing](https://cybersectools.com/categories/sast) solution by [Start Left® Security](https://cybersectools.com/companies/start-leftr-security). Features, integrations, deployment and the company behind each one, side by side.

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## Side-by-side comparison

| | cfn-nag | Start Left® IaC Security |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Static Application Security Testing | Static Application Security Testing |
| Verified | No | No |
| Deployment type | On-Premises | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| GitHub stars | 1,288 | – |
| Last commit | Jun 2022 | – |
| Company | – | Start Left® Security |
| Headquarters | – | – |

### Use cases and capabilities

| | cfn-nag | Start Left® IaC Security |
|---|---|---|
| Security Scanning | Yes | – |
| DevSecOps | Yes | Yes |
| AWS | Yes | – |
| Infrastructure as Code | Yes | Yes |
| CI/CD | Yes | Yes |
| Misconfiguration | – | Yes |
| Secure Development | – | Yes |

### Core features

**cfn-nag**

No features listed.

**Start Left® IaC Security**

4 features listed. Sign in on the page to see them.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [cfn-nag](https://cybersectools.com/tools/cfn-nag) fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product.
- [Start Left® IaC Security](https://cybersectools.com/tools/start-leftr-iac-security) fits if you want a cloud product.

## cfn-nag vs Start Left® IaC Security FAQ

Common questions when comparing cfn-nag vs Start Left® IaC Security for static application security testing.

### What is the difference between cfn-nag and Start Left® IaC Security?

**cfn-nag**: Cfn-nag is a static analysis tool that scans AWS CloudFormation templates to identify security vulnerabilities and misconfigurations in infrastructure-as-code.

**Start Left® IaC Security**: Scans IaC templates for misconfigs and vulns before deployment, built by Start Left® Security.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes cfn-nag and Start Left® IaC Security?

**cfn-nag** is open-source with 1,288 GitHub stars. **Start Left® IaC Security** is made by Start Left® Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is cfn-nag a good alternative to Start Left® IaC Security?

Often, yes. cfn-nag and Start Left® IaC Security are both Static Application Security Testing products, and both cover Infrastructure as Code, DevSecOps, CI/CD. Key differences: cfn-nag is Free while Start Left® IaC Security is Commercial, cfn-nag is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [cfn-nag vs Meterian ISAAC](https://cybersectools.com/compare/cfn-nag-vs-meterian-isaac)
- [cfn-nag vs Aikido Infrastructure as Code (IaC)](https://cybersectools.com/compare/aikido-infrastructure-as-code-iac-vs-cfn-nag)
- [cfn-nag vs Qodo AI Code Review Platform](https://cybersectools.com/compare/cfn-nag-vs-qodo-for-pycharm)
- [Start Left® IaC Security vs Meterian ISAAC](https://cybersectools.com/compare/meterian-isaac-vs-start-leftr-iac-security)
- [Start Left® IaC Security vs Aikido Infrastructure as Code (IaC)](https://cybersectools.com/compare/aikido-infrastructure-as-code-iac-vs-start-leftr-iac-security)
- [Start Left® IaC Security vs Qodo AI Code Review Platform](https://cybersectools.com/compare/qodo-for-pycharm-vs-start-leftr-iac-security)

## Alternatives to each

- [See all cfn-nag alternatives](https://cybersectools.com/alternatives/cfn-nag)
- [See all Start Left® IaC Security alternatives](https://cybersectools.com/alternatives/start-leftr-iac-security)

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Source: https://cybersectools.com/compare/cfn-nag-vs-start-leftr-iac-security

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/cfn-nag.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on cfn-nag and Start Left® IaC Security: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md