# censys-enumeration vs crt.guru: side-by-side comparison (2026)

[censys-enumeration](https://cybersectools.com/tools/censys-enumeration) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [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). 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, Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | censys-enumeration | crt.guru |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | 152 | – |
| Last commit | Jan 2019 | – |
| Company | – | Crt.guru |
| Headquarters | – | – |

### Use cases and capabilities

| | censys-enumeration | crt.guru |
|---|---|---|
| TLS | Yes | Yes |
| Enumeration | Yes | – |
| SSL | Yes | Yes |
| Reconnaissance | Yes | – |
| Subdomain Enumeration | Yes | – |
| PCI DSS | – | Yes |
| NIST | – | Yes |
| Security Scanning | – | Yes |
| Alerting | – | Yes |
| Security Compliance Training | – | Yes |
| Security Reporting | – | Yes |
| Vulnerability | – | Yes |
| REST API | – | Yes |

### Core features

**censys-enumeration**

No features listed.

**crt.guru**

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

### Integrations

**censys-enumeration**

No integrations listed.

**crt.guru**

4 integrations 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.

- [censys-enumeration](https://cybersectools.com/tools/censys-enumeration) fits if you need a free product and you want an open-source product.

## censys-enumeration vs crt.guru FAQ

Common questions when comparing censys-enumeration vs crt.guru for external attack surface management.

### What is the difference between censys-enumeration and crt.guru?

**censys-enumeration**: A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.

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

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

### Who makes censys-enumeration and crt.guru?

**censys-enumeration** is open-source with 152 GitHub stars. **crt.guru** is made by Crt.guru. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is censys-enumeration a good alternative to crt.guru?

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

## Related comparisons

- [censys-enumeration vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-censys-enumeration)
- [censys-enumeration vs SurfaceDiff](https://cybersectools.com/compare/censys-enumeration-vs-surfacediff)
- [censys-enumeration vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/censys-enumeration-vs-ddactic-attack-surface-discovery)
- [crt.guru vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-crtguru)
- [crt.guru vs SurfaceDiff](https://cybersectools.com/compare/crtguru-vs-surfacediff)
- [crt.guru vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/crtguru-vs-ddactic-attack-surface-discovery)

## Alternatives to each

- [See all censys-enumeration alternatives](https://cybersectools.com/alternatives/censys-enumeration)
- [See all crt.guru alternatives](https://cybersectools.com/alternatives/crtguru)

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Source: https://cybersectools.com/compare/censys-enumeration-vs-crtguru

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

More on censys-enumeration and crt.guru: 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