# Gray Swan AI Security Suite vs Promptfoo Guardrails: side-by-side comparison (2026)

[Gray Swan AI Security Suite](https://cybersectools.com/tools/gray-swan-ai-security-suite) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [Gray Swan](https://cybersectools.com/companies/gray-swan). [Promptfoo Guardrails](https://cybersectools.com/tools/promptfoo-guardrails) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [Promptfoo](https://cybersectools.com/companies/promptfoo). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Gray Swan AI Security Suite | Promptfoo Guardrails |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | LLM Guardrails | LLM Guardrails |
| Verified | No | No |
| Deployment type | Cloud | Hybrid |
| Company size fit | Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| Company | Gray Swan | Promptfoo |
| Headquarters | – | – |

### Use cases and capabilities

| | Gray Swan AI Security Suite | Promptfoo Guardrails |
|---|---|---|
| Research | Yes | – |
| LLM Guardrails | – | Yes |
| LLM Security | – | Yes |
| AI Firewall | – | Yes |
| Prompt Injection | – | Yes |
| GenAI Security | – | Yes |
| Red Team | – | Yes |
| Generative AI | – | Yes |
| Continuous Testing | – | Yes |
| Adversarial ML | – | Yes |
| AI Governance | – | Yes |

### Core features

**Gray Swan AI Security Suite**

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

**Promptfoo Guardrails**

6 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.

- [Gray Swan AI Security Suite](https://cybersectools.com/tools/gray-swan-ai-security-suite) fits if you want a cloud product.
- [Promptfoo Guardrails](https://cybersectools.com/tools/promptfoo-guardrails) fits if you need both cloud and on-premises options and you are a startup or a small business.

## Gray Swan AI Security Suite vs Promptfoo Guardrails FAQ

Common questions when comparing Gray Swan AI Security Suite vs Promptfoo Guardrails for LLM guardrails.

### What is the difference between Gray Swan AI Security Suite and Promptfoo Guardrails?

**Gray Swan AI Security Suite**: Enterprise AI security suite with real-time filtering and automated testing. Built by Gray Swan.

**Promptfoo Guardrails**: Adaptive LLM guardrails that self-improve via red team feedback loops. Built by Promptfoo.

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

### Who makes Gray Swan AI Security Suite and Promptfoo Guardrails?

**Gray Swan AI Security Suite** is made by Gray Swan. **Promptfoo Guardrails** is made by Promptfoo. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Gray Swan AI Security Suite a good alternative to Promptfoo Guardrails?

Often, yes. Gray Swan AI Security Suite and Promptfoo Guardrails are both LLM Guardrails products. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Gray Swan AI Security Suite vs RealmGuard](https://cybersectools.com/compare/gray-swan-ai-security-suite-vs-realm-labs-platform)
- [Gray Swan AI Security Suite vs Confident Security](https://cybersectools.com/compare/confident-security-vs-gray-swan-ai-security-suite)
- [Gray Swan AI Security Suite vs PointGuard AI Intelligent Guardrails](https://cybersectools.com/compare/gray-swan-ai-security-suite-vs-pointguard-ai-intelligent-guardrails)
- [Promptfoo Guardrails vs RealmGuard](https://cybersectools.com/compare/promptfoo-guardrails-vs-realm-labs-platform)
- [Promptfoo Guardrails vs Confident Security](https://cybersectools.com/compare/confident-security-vs-promptfoo-guardrails)
- [Promptfoo Guardrails vs PointGuard AI Intelligent Guardrails](https://cybersectools.com/compare/pointguard-ai-intelligent-guardrails-vs-promptfoo-guardrails)

## Alternatives to each

- [See all Gray Swan AI Security Suite alternatives](https://cybersectools.com/alternatives/gray-swan-ai-security-suite)
- [See all Promptfoo Guardrails alternatives](https://cybersectools.com/alternatives/promptfoo-guardrails)

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Source: https://cybersectools.com/compare/gray-swan-ai-security-suite-vs-promptfoo-guardrails

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

More on Gray Swan AI Security Suite and Promptfoo Guardrails: 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