# Cert Spotter vs Siemba EASM: side-by-side comparison (2026)

[Cert Spotter](https://cybersectools.com/tools/cert-spotter) is a free [external attack surface management](https://cybersectools.com/categories/external-asm) solution. [Siemba EASM](https://cybersectools.com/tools/siemba-easm) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Siemba](https://cybersectools.com/companies/siemba). 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

| | Cert Spotter | Siemba EASM |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Hybrid | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| GitHub stars | 1,132 | – |
| Last commit | Jan 2026 | – |
| Company | – | Siemba |
| Headquarters | – | – |

### Use cases and capabilities

| | Cert Spotter | Siemba EASM |
|---|---|---|
| TLS | Yes | Yes |
| SSL | Yes | – |
| Alerting | Yes | – |
| Misconfiguration | – | Yes |

### Core features

**Cert Spotter**

No features listed.

**Siemba EASM**

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

### Integrations

**Cert Spotter**

No integrations listed.

**Siemba EASM**

6 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.

- [Cert Spotter](https://cybersectools.com/tools/cert-spotter) fits if you need both cloud and on-premises options, you are a startup, you need a free product and you want an open-source product.
- [Siemba EASM](https://cybersectools.com/tools/siemba-easm) fits if you want a cloud product.

## Cert Spotter vs Siemba EASM FAQ

Common questions when comparing Cert Spotter vs Siemba EASM for external attack surface management.

### What is the difference between Cert Spotter and Siemba EASM?

**Cert Spotter**: A Certificate Transparency log monitor that alerts users when SSL/TLS certificates are issued for their domains, helping detect unauthorized certificate issuance and potential security threats.

**Siemba EASM**: AI-driven EASM platform for discovering and monitoring external-facing assets. Built by Siemba.

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

### Who makes Cert Spotter and Siemba EASM?

**Cert Spotter** is open-source with 1,132 GitHub stars. **Siemba EASM** is made by Siemba. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Cert Spotter a good alternative to Siemba EASM?

Often, yes. Cert Spotter and Siemba EASM are both External Attack Surface Management products, and both cover TLS. Key differences: Cert Spotter is Free while Siemba EASM is Commercial, Cert Spotter is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Cert Spotter vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-cert-spotter)
- [Cert Spotter vs crt.guru](https://cybersectools.com/compare/cert-spotter-vs-crtguru)
- [Cert Spotter vs DNS Assistant](https://cybersectools.com/compare/cert-spotter-vs-dns-assistant)
- [Siemba EASM vs Attack Surface Scan](https://cybersectools.com/compare/attack-surface-scan-vs-siemba-easm)
- [Siemba EASM vs crt.guru](https://cybersectools.com/compare/crtguru-vs-siemba-easm)
- [Siemba EASM vs DNS Assistant](https://cybersectools.com/compare/dns-assistant-vs-siemba-easm)

## Alternatives to each

- [See all Cert Spotter alternatives](https://cybersectools.com/alternatives/cert-spotter)
- [See all Siemba EASM alternatives](https://cybersectools.com/alternatives/siemba-easm)

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Source: https://cybersectools.com/compare/cert-spotter-vs-siemba-easm

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

More on Cert Spotter and Siemba EASM: 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