# crt.guru vs Subra: 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). [Subra](https://cybersectools.com/tools/subra) 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, Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | crt.guru | Subra |
|---|---|---|
| Pricing model | Commercial | Free |
| 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 |
| GitHub stars | – | 54 |
| Last commit | – | Jun 2020 |
| Company | Crt.guru | – |
| Headquarters | – | – |

### Use cases and capabilities

| | crt.guru | Subra |
|---|---|---|
| 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 | – |
| Subdomain Enumeration | – | Yes |

### Core features

**crt.guru**

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

**Subra**

No features listed.

### Integrations

**crt.guru**

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

**Subra**

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 are a mid-market company or an enterprise.
- [Subra](https://cybersectools.com/tools/subra) fits if you need a free product and you want an open-source product.

## crt.guru vs Subra FAQ

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

### What is the difference between crt.guru and Subra?

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

**Subra**: A simple web-based interface for subdomain enumeration using the subfinder tool.

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

### Who makes crt.guru and Subra?

**crt.guru** is made by Crt.guru. **Subra** is open-source with 54 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 Subra?

Often, yes. crt.guru and Subra are both External Attack Surface Management products. Key differences: crt.guru is Commercial while Subra is Free, Subra 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 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)
- [Subra vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-subra)
- [Subra vs SurfaceDiff](https://cybersectools.com/compare/subra-vs-surfacediff)
- [Subra vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-subra)

## Alternatives to each

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

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Source: https://cybersectools.com/compare/crtguru-vs-subra

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 Subra: 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