# crt.guru vs OWASP Amass: side-by-side comparison (2026)

[crt.guru](https://cybersectools.com/tools/crtguru) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Crt.guru](https://cybersectools.com/companies/crtguru). [OWASP Amass](https://cybersectools.com/tools/owasp-amass) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions) picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Google Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | crt.guru | OWASP Amass |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | – | 14,260 |
| Last commit | – | Sep 2025 |
| Company | Crt.guru | – |
| Headquarters | – | – |

### Use cases and capabilities

| | crt.guru | OWASP Amass |
|---|---|---|
| TLS | Yes | – |
| SSL | Yes | – |
| PCI DSS | Yes | – |
| NIST | Yes | – |
| Security Scanning | Yes | – |
| Alerting | Yes | – |
| Security Compliance Training | Yes | – |
| Security Reporting | Yes | – |
| Vulnerability | Yes | – |
| REST API | Yes | – |
| Network Mapping | – | Yes |
| OSINT | – | Yes |

### Core features

**crt.guru**

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

**OWASP Amass**

No features listed.

### Integrations

**crt.guru**

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

**OWASP Amass**

No integrations listed.

## Which one fits you

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

- [crt.guru](https://cybersectools.com/tools/crtguru) fits if you want a cloud product.
- [OWASP Amass](https://cybersectools.com/tools/owasp-amass) fits if you need to run it on your own servers, you need a free product and you want an open-source product.

## crt.guru vs OWASP Amass FAQ

Common questions when comparing crt.guru vs OWASP Amass for external attack surface management.

### What is the difference between crt.guru and OWASP Amass?

**crt.guru**: External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports, built by Crt.guru.

**OWASP Amass**: Performs network mapping of attack surfaces and external asset discovery using open source information gathering and active reconnaissance techniques.

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

### Who makes crt.guru and OWASP Amass?

**crt.guru** is made by Crt.guru. **OWASP Amass** is open-source with 14,260 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is crt.guru a good alternative to OWASP Amass?

Often, yes. crt.guru and OWASP Amass are both External Attack Surface Management products. Key differences: crt.guru is Commercial while OWASP Amass is Free, OWASP Amass is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [crt.guru vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-crtguru)
- [crt.guru vs DarkInvader EASM Platform](https://cybersectools.com/compare/crtguru-vs-darkinvader-easm-platform)
- [crt.guru vs Driftnet Explore](https://cybersectools.com/compare/crtguru-vs-driftnet-explore)
- [OWASP Amass vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-owasp-amass)
- [OWASP Amass vs DarkInvader EASM Platform](https://cybersectools.com/compare/darkinvader-easm-platform-vs-owasp-amass)
- [OWASP Amass vs Driftnet Explore](https://cybersectools.com/compare/driftnet-explore-vs-owasp-amass)

## Alternatives to each

- [See all crt.guru alternatives](https://cybersectools.com/alternatives/crtguru)
- [See all OWASP Amass alternatives](https://cybersectools.com/alternatives/owasp-amass)

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Source: https://cybersectools.com/compare/crtguru-vs-owasp-amass

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

More on crt.guru and OWASP Amass: 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