# Promptfoo Guardrails vs Sun.Security Sun: side-by-side comparison (2026)

[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). [Sun.Security Sun](https://cybersectools.com/tools/sunsecurity-sun) is a commercial [agentic AI security](https://cybersectools.com/categories/agentic-ai-security) solution by [Sun.Security](https://cybersectools.com/companies/sunsecurity). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Promptfoo Guardrails | Sun.Security Sun |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | LLM Guardrails | Agentic AI Security |
| Verified | No | No |
| Deployment type | Hybrid | Hybrid |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Mid-Market, Enterprise |
| Company | Promptfoo | Sun.Security |
| Headquarters | – | – |

### Use cases and capabilities

| | Promptfoo Guardrails | Sun.Security Sun |
|---|---|---|
| LLM Guardrails | Yes | – |
| LLM Security | Yes | – |
| AI Firewall | Yes | – |
| Prompt Injection | Yes | Yes |
| GenAI Security | Yes | – |
| Red Team | Yes | – |
| Generative AI | Yes | Yes |
| Continuous Testing | Yes | – |
| Adversarial ML | Yes | – |
| AI Governance | Yes | Yes |
| Agentic AI Security | – | Yes |
| MCP Security | – | Yes |
| AI Observability | – | Yes |
| Anomaly Detection | – | Yes |
| Visibility | – | Yes |
| Runtime Security | – | Yes |
| Data Exfiltration | – | Yes |

### Core features

**Promptfoo Guardrails**

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

**Sun.Security Sun**

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

### Integrations

**Promptfoo Guardrails**

No integrations listed.

**Sun.Security Sun**

4 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.

- [Promptfoo Guardrails](https://cybersectools.com/tools/promptfoo-guardrails) fits if you are a startup or a small business.

## Promptfoo Guardrails vs Sun.Security Sun FAQ

Common questions when comparing Promptfoo Guardrails vs Sun.Security Sun for LLM guardrails.

### What is the difference between Promptfoo Guardrails and Sun.Security Sun?

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

**Sun.Security Sun**: Security platform for discovering, assessing, and controlling AI agent behavior. Built by Sun.Security.

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

### Who makes Promptfoo Guardrails and Sun.Security Sun?

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

### Is Promptfoo Guardrails a good alternative to Sun.Security Sun?

In part. Promptfoo Guardrails and Sun.Security Sun are not in the same category on CybersecTools. Both cover AI Governance, Generative AI, Prompt Injection. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Promptfoo Guardrails vs First Recon AI Firewall](https://cybersectools.com/compare/first-recon-ai-firewall-vs-promptfoo-guardrails)
- [Promptfoo Guardrails vs Airia AI Platform Guardrails](https://cybersectools.com/compare/airia-ai-platform-guardrails-vs-promptfoo-guardrails)
- [Promptfoo Guardrails vs ThirdLaw AI Control Layer](https://cybersectools.com/compare/promptfoo-guardrails-vs-thirdlaw-ai-control-layer)
- [Sun.Security Sun vs First Recon AI Firewall](https://cybersectools.com/compare/first-recon-ai-firewall-vs-sunsecurity-sun)
- [Sun.Security Sun vs Airia AI Platform Guardrails](https://cybersectools.com/compare/airia-ai-platform-guardrails-vs-sunsecurity-sun)
- [Sun.Security Sun vs ThirdLaw AI Control Layer](https://cybersectools.com/compare/sunsecurity-sun-vs-thirdlaw-ai-control-layer)

## Alternatives to each

- [See all Promptfoo Guardrails alternatives](https://cybersectools.com/alternatives/promptfoo-guardrails)
- [See all Sun.Security Sun alternatives](https://cybersectools.com/alternatives/sunsecurity-sun)

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Source: https://cybersectools.com/compare/promptfoo-guardrails-vs-sunsecurity-sun

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

More on Promptfoo Guardrails and Sun.Security Sun: 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