# Codenotary Guardian vs Nessus Professional: side-by-side comparison (2026)

[Codenotary Guardian](https://cybersectools.com/tools/codenotary-guardian) is a commercial [workload protection](https://cybersectools.com/categories/workload-protection) solution by [Codenotary](https://cybersectools.com/companies/codenotary). [Nessus Professional](https://cybersectools.com/tools/nessus-professional) is a commercial [vulnerability assessment](https://cybersectools.com/categories/vulnerability-assessment) solution by [Tenable](https://cybersectools.com/companies/tenable). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Codenotary Guardian | Nessus Professional |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | Workload Protection | Vulnerability Assessment |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| Company | Codenotary | Tenable |
| Headquarters | – | – |

### Use cases and capabilities

| | Codenotary Guardian | Nessus Professional |
|---|---|---|
| Zero Day | Yes | – |
| CIS | Yes | Yes |
| Linux | Yes | – |
| Vulnerability | – | Yes |
| Security Scanning | – | Yes |
| CVE | – | Yes |
| Penetration Testing Framework | – | Yes |
| NIST | – | Yes |
| PCI DSS | – | Yes |
| Network Scanning | – | Yes |
| VAPT | – | Yes |

### Core features

**Codenotary Guardian**

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

**Nessus Professional**

10 features 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.

- [Codenotary Guardian](https://cybersectools.com/tools/codenotary-guardian) fits if you want a cloud product.
- [Nessus Professional](https://cybersectools.com/tools/nessus-professional) fits if you need to run it on your own servers.

## Codenotary Guardian vs Nessus Professional FAQ

Common questions when comparing Codenotary Guardian vs Nessus Professional for workload protection.

### What is the difference between Codenotary Guardian and Nessus Professional?

**Codenotary Guardian**: AI-powered Linux system protection with auto-remediation and compliance. Built by Codenotary.

**Nessus Professional**: Vulnerability scanner for assessing networks, systems, and apps for security flaws. Built by Tenable.

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

### Who makes Codenotary Guardian and Nessus Professional?

**Codenotary Guardian** is made by Codenotary. **Nessus Professional** is made by Tenable. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Codenotary Guardian a good alternative to Nessus Professional?

In part. Codenotary Guardian and Nessus Professional are not in the same category on CybersecTools. Both cover CIS. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Codenotary Guardian vs Monarx Threat Detection](https://cybersectools.com/compare/codenotary-guardian-vs-monarx-threat-detection)
- [Codenotary Guardian vs Invary Runtime Integrity Solution](https://cybersectools.com/compare/codenotary-guardian-vs-invary-runtime-integrity-solution)
- [Codenotary Guardian vs Vali Cyber ZeroLock](https://cybersectools.com/compare/codenotary-guardian-vs-vali-cyber-zerolock)
- [Nessus Professional vs Monarx Threat Detection](https://cybersectools.com/compare/monarx-threat-detection-vs-nessus-professional)
- [Nessus Professional vs Invary Runtime Integrity Solution](https://cybersectools.com/compare/invary-runtime-integrity-solution-vs-nessus-professional)
- [Nessus Professional vs Vali Cyber ZeroLock](https://cybersectools.com/compare/nessus-professional-vs-vali-cyber-zerolock)

## Alternatives to each

- [See all Codenotary Guardian alternatives](https://cybersectools.com/alternatives/codenotary-guardian)
- [See all Nessus Professional alternatives](https://cybersectools.com/alternatives/nessus-professional)

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Source: https://cybersectools.com/compare/codenotary-guardian-vs-nessus-professional

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

More on Codenotary Guardian and Nessus Professional: 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