# Microsoft Defender EASM vs StrikeOne Attack Surfa: side-by-side comparison (2026)

[Microsoft Defender EASM](https://cybersectools.com/tools/microsoft-defender-external-attack-surface-management) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Microsoft](https://cybersectools.com/companies/microsoft). [StrikeOne Attack Surfa](https://cybersectools.com/tools/strikeone-attack-surfa) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [StrikeOne](https://cybersectools.com/companies/strikeone). Features, integrations, deployment and the company behind each one, side by side.

## Our take

What our shortlists say about the one we picked.

### [Microsoft Defender EASM](https://cybersectools.com/tools/microsoft-defender-external-attack-surface-management)

Best for: Microsoft shops adding external asset discovery

It belongs here if you already pay for Microsoft security, because discovered assets can move into Defender for Cloud and Copilot in Azure turns plain questions into inventory searches. It fits companies from small to enterprise. Its features center on discovery and flagging, so ask whether you also need active testing to prove which exposures are real.

From [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions), Fall 2026.

Reviewed by [Nika (Nikoloz) Kokhreidze](https://cybersectools.com/about).

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, Google Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | Microsoft Defender EASM | StrikeOne Attack Surfa |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | Microsoft | StrikeOne |
| Headquarters | – | – |

### Use cases and capabilities

| | Microsoft Defender EASM | StrikeOne Attack Surfa |
|---|---|---|
| Visibility | – | Yes |

### Core features

**Microsoft Defender EASM**

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

**StrikeOne Attack Surfa**

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

### Integrations

**Microsoft Defender EASM**

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

**StrikeOne Attack Surfa**

No integrations listed.

## Microsoft Defender EASM vs StrikeOne Attack Surfa FAQ

Common questions when comparing Microsoft Defender EASM vs StrikeOne Attack Surfa for external attack surface management.

### What is the difference between Microsoft Defender EASM and StrikeOne Attack Surfa?

**Microsoft Defender EASM**: Discovers and monitors external-facing assets and vulnerabilities, built by Microsoft.

**StrikeOne Attack Surfa**: AI-powered attack surface management platform for cybersecurity monitoring, built by StrikeOne.

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

### Who makes Microsoft Defender EASM and StrikeOne Attack Surfa?

**Microsoft Defender EASM** is made by Microsoft. **StrikeOne Attack Surfa** is made by StrikeOne. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Microsoft Defender EASM a good alternative to StrikeOne Attack Surfa?

Often, yes. Microsoft Defender EASM and StrikeOne Attack Surfa are both External Attack Surface Management products. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Microsoft Defender EASM vs CyCognito EASM Platform](https://cybersectools.com/compare/cycognito-easm-platform-vs-microsoft-defender-external-attack-surface-management)
- [Microsoft Defender EASM vs Attaxion](https://cybersectools.com/compare/attaxion-vs-microsoft-defender-external-attack-surface-management)
- [Microsoft Defender EASM vs GuardEon](https://cybersectools.com/compare/guardeon-vs-microsoft-defender-external-attack-surface-management)
- [StrikeOne Attack Surfa vs CyCognito EASM Platform](https://cybersectools.com/compare/cycognito-easm-platform-vs-strikeone-attack-surfa)
- [StrikeOne Attack Surfa vs Attaxion](https://cybersectools.com/compare/attaxion-vs-strikeone-attack-surfa)
- [StrikeOne Attack Surfa vs GuardEon](https://cybersectools.com/compare/guardeon-vs-strikeone-attack-surfa)

## Alternatives to each

- [See all Microsoft Defender EASM alternatives](https://cybersectools.com/alternatives/microsoft-defender-external-attack-surface-management)
- [See all StrikeOne Attack Surfa alternatives](https://cybersectools.com/alternatives/strikeone-attack-surfa)

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Source: https://cybersectools.com/compare/microsoft-defender-external-attack-surface-management-vs-strikeone-attack-surfa

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

More on Microsoft Defender EASM and StrikeOne Attack Surfa: 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