# Halo Security Attack Surface Discovery vs Subra: side-by-side comparison (2026)

[Halo Security Attack Surface Discovery](https://cybersectools.com/tools/halo-security-attack-surface-discovery) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Halo Security](https://cybersectools.com/companies/halo-security). [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

| | Halo Security Attack Surface Discovery | Subra |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB |
| GitHub stars | – | 54 |
| Last commit | – | Jun 2020 |
| Company | Halo Security | – |
| Headquarters | – | – |

### Use cases and capabilities

| | Halo Security Attack Surface Discovery | Subra |
|---|---|---|
| Network Scanning | Yes | – |
| Port Scanning | Yes | – |
| Subdomain Enumeration | Yes | Yes |

### Core features

**Halo Security Attack Surface Discovery**

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

**Subra**

No features listed.

### Integrations

**Halo Security Attack Surface Discovery**

5 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.

- [Halo Security Attack Surface Discovery](https://cybersectools.com/tools/halo-security-attack-surface-discovery) fits if you are a mid-market company or an enterprise.
- [Subra](https://cybersectools.com/tools/subra) fits if you are a startup, you need a free product and you want an open-source product.

## Halo Security Attack Surface Discovery vs Subra FAQ

Common questions when comparing Halo Security Attack Surface Discovery vs Subra for external attack surface management.

### What is the difference between Halo Security Attack Surface Discovery and Subra?

**Halo Security Attack Surface Discovery**: Discovers and inventories internet-facing assets including subdomains, IPs, and apps, built by Halo Security.

**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 Halo Security Attack Surface Discovery and Subra?

**Halo Security Attack Surface Discovery** is made by Halo Security. **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 Halo Security Attack Surface Discovery a good alternative to Subra?

Often, yes. Halo Security Attack Surface Discovery and Subra are both External Attack Surface Management products, and both cover Subdomain Enumeration. Key differences: Halo Security Attack Surface Discovery 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

- [Halo Security Attack Surface Discovery vs SurfaceDiff](https://cybersectools.com/compare/halo-security-attack-surface-discovery-vs-surfacediff)
- [Halo Security Attack Surface Discovery vs ArmorPoint Attack Surface Management](https://cybersectools.com/compare/armorpoint-attack-surface-management-vs-halo-security-attack-surface-discovery)
- [Halo Security Attack Surface Discovery vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-halo-security-attack-surface-discovery)
- [Subra vs SurfaceDiff](https://cybersectools.com/compare/subra-vs-surfacediff)
- [Subra vs ArmorPoint Attack Surface Management](https://cybersectools.com/compare/armorpoint-attack-surface-management-vs-subra)
- [Subra vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-subra)

## Alternatives to each

- [See all Halo Security Attack Surface Discovery alternatives](https://cybersectools.com/alternatives/halo-security-attack-surface-discovery)
- [See all Subra alternatives](https://cybersectools.com/alternatives/subra)

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Source: https://cybersectools.com/compare/halo-security-attack-surface-discovery-vs-subra

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

More on Halo Security Attack Surface Discovery 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