# as3nt vs Halo Security Attack Surface Discovery: side-by-side comparison (2026)

[as3nt](https://cybersectools.com/tools/as3nt) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [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). 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

| | as3nt | Halo Security Attack Surface Discovery |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | On-Premises | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| GitHub stars | 12 | – |
| Last commit | Oct 2022 | – |
| Company | – | Halo Security |
| Headquarters | – | – |

### Use cases and capabilities

| | as3nt | Halo Security Attack Surface Discovery |
|---|---|---|
| Security Research | Yes | – |
| Subdomain Enumeration | Yes | Yes |
| Network Scanning | – | Yes |
| Port Scanning | – | Yes |

### Core features

**as3nt**

No features listed.

**Halo Security Attack Surface Discovery**

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

### Integrations

**as3nt**

No integrations listed.

**Halo Security Attack Surface Discovery**

5 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.

- [as3nt](https://cybersectools.com/tools/as3nt) 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.
- [Halo Security Attack Surface Discovery](https://cybersectools.com/tools/halo-security-attack-surface-discovery) fits if you want a cloud product.

## as3nt vs Halo Security Attack Surface Discovery FAQ

Common questions when comparing as3nt vs Halo Security Attack Surface Discovery for external attack surface management.

### What is the difference between as3nt and Halo Security Attack Surface Discovery?

**as3nt**: A tool for enumerating subdomains of a given domain.

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

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

### Who makes as3nt and Halo Security Attack Surface Discovery?

**as3nt** is open-source with 12 GitHub stars. **Halo Security Attack Surface Discovery** is made by Halo Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is as3nt a good alternative to Halo Security Attack Surface Discovery?

Often, yes. as3nt and Halo Security Attack Surface Discovery are both External Attack Surface Management products, and both cover Subdomain Enumeration. Key differences: as3nt is Free while Halo Security Attack Surface Discovery is Commercial, as3nt is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [as3nt vs SurfaceDiff](https://cybersectools.com/compare/as3nt-vs-surfacediff)
- [as3nt vs ArmorPoint Attack Surface Management](https://cybersectools.com/compare/armorpoint-attack-surface-management-vs-as3nt)
- [as3nt vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/as3nt-vs-ddactic-attack-surface-discovery)
- [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)

## Alternatives to each

- [See all as3nt alternatives](https://cybersectools.com/alternatives/as3nt)
- [See all Halo Security Attack Surface Discovery alternatives](https://cybersectools.com/alternatives/halo-security-attack-surface-discovery)

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Source: https://cybersectools.com/compare/as3nt-vs-halo-security-attack-surface-discovery

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/as3nt.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on as3nt and Halo Security Attack Surface Discovery: 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