# Assetnote ASM vs SurfaceDiff: side-by-side comparison (2026)

[Assetnote ASM](https://cybersectools.com/tools/assetnote-asm) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Assetnote](https://cybersectools.com/companies/assetnote). [SurfaceDiff](https://cybersectools.com/tools/surfacediff) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [SurfaceDiff](https://cybersectools.com/companies/surfacediff). 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

| | Assetnote ASM | SurfaceDiff |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| Company | Assetnote | SurfaceDiff |
| Headquarters | – | – |

### Use cases and capabilities

| | Assetnote ASM | SurfaceDiff |
|---|---|---|
| Security Scanning | Yes | Yes |
| DNS Security | – | Yes |
| Port Scanning | – | Yes |
| TLS | – | Yes |
| Subdomain Enumeration | – | Yes |
| Network Scanning | – | Yes |
| Alerting | – | Yes |
| Reconnaissance | – | Yes |
| Visibility | – | Yes |
| Web Security | – | Yes |

### Core features

**Assetnote ASM**

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

**SurfaceDiff**

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

### Integrations

**Assetnote ASM**

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

**SurfaceDiff**

No integrations listed.

## Which one fits you

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

- [SurfaceDiff](https://cybersectools.com/tools/surfacediff) fits if you are a startup or a small business.

## Assetnote ASM vs SurfaceDiff FAQ

Common questions when comparing Assetnote ASM vs SurfaceDiff for external attack surface management.

### What is the difference between Assetnote ASM and SurfaceDiff?

**Assetnote ASM**: External attack surface management platform with continuous asset discovery. Built by Assetnote.

**SurfaceDiff**: Continuous external attack surface monitoring that shows what changed between scans. Built by SurfaceDiff.

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

### Who makes Assetnote ASM and SurfaceDiff?

**Assetnote ASM** is made by Assetnote founded in 2018-01-01T00:00:00.000Z. **SurfaceDiff** is made by SurfaceDiff. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Assetnote ASM a good alternative to SurfaceDiff?

Often, yes. Assetnote ASM and SurfaceDiff are both External Attack Surface Management products, and both cover Security Scanning. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Assetnote ASM vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/assetnote-asm-vs-ddactic-attack-surface-discovery)
- [Assetnote ASM vs Attack Surface Scan](https://cybersectools.com/compare/assetnote-asm-vs-attack-surface-scan)
- [Assetnote ASM vs Trickest ASM - Attack Surface Management](https://cybersectools.com/compare/assetnote-asm-vs-trickest-asm-attack-surface-management)
- [SurfaceDiff vs DDactic Attack Surface Discovery](https://cybersectools.com/compare/ddactic-attack-surface-discovery-vs-surfacediff)
- [SurfaceDiff vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-surfacediff)
- [SurfaceDiff vs Trickest ASM - Attack Surface Management](https://cybersectools.com/compare/surfacediff-vs-trickest-asm-attack-surface-management)

## Alternatives to each

- [See all Assetnote ASM alternatives](https://cybersectools.com/alternatives/assetnote-asm)
- [See all SurfaceDiff alternatives](https://cybersectools.com/alternatives/surfacediff)

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Source: https://cybersectools.com/compare/assetnote-asm-vs-surfacediff

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

More on Assetnote ASM and SurfaceDiff: 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