# Promptfoo Guardrails vs Zscaler AI Runtime Protection: 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). [Zscaler AI Runtime Protection](https://cybersectools.com/tools/zscaler-ai-runtime-protection) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [SPLX](https://cybersectools.com/companies/splx). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Promptfoo Guardrails | Zscaler AI Runtime Protection |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | LLM Guardrails | LLM Guardrails |
| Verified | No | No |
| Deployment type | Hybrid | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Mid-Market, Enterprise |
| Company | Promptfoo | SPLX |
| Headquarters | – | – |

### Use cases and capabilities

| | Promptfoo Guardrails | Zscaler AI Runtime Protection |
|---|---|---|
| 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 | – |
| Anomaly Detection | – | Yes |

### Core features

**Promptfoo Guardrails**

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

**Zscaler AI Runtime Protection**

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

### Integrations

**Promptfoo Guardrails**

No integrations listed.

**Zscaler AI Runtime Protection**

3 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 need both cloud and on-premises options and you are a startup or a small business.
- [Zscaler AI Runtime Protection](https://cybersectools.com/tools/zscaler-ai-runtime-protection) fits if you want a cloud product.

## Promptfoo Guardrails vs Zscaler AI Runtime Protection FAQ

Common questions when comparing Promptfoo Guardrails vs Zscaler AI Runtime Protection for LLM guardrails.

### What is the difference between Promptfoo Guardrails and Zscaler AI Runtime Protection?

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

**Zscaler AI Runtime Protection**: Runtime protection for AI systems detecting prompt attacks & data leaks. Built by SPLX.

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

### Who makes Promptfoo Guardrails and Zscaler AI Runtime Protection?

**Promptfoo Guardrails** is made by Promptfoo. **Zscaler AI Runtime Protection** is made by SPLX. 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 Zscaler AI Runtime Protection?

Often, yes. Promptfoo Guardrails and Zscaler AI Runtime Protection are both LLM Guardrails products. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [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)
- [Zscaler AI Runtime Protection vs RealmGuard](https://cybersectools.com/compare/realm-labs-platform-vs-zscaler-ai-runtime-protection)
- [Zscaler AI Runtime Protection vs Confident Security](https://cybersectools.com/compare/confident-security-vs-zscaler-ai-runtime-protection)
- [Zscaler AI Runtime Protection vs PointGuard AI Intelligent Guardrails](https://cybersectools.com/compare/pointguard-ai-intelligent-guardrails-vs-zscaler-ai-runtime-protection)

## Alternatives to each

- [See all Promptfoo Guardrails alternatives](https://cybersectools.com/alternatives/promptfoo-guardrails)
- [See all Zscaler AI Runtime Protection alternatives](https://cybersectools.com/alternatives/zscaler-ai-runtime-protection)

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Source: https://cybersectools.com/compare/promptfoo-guardrails-vs-zscaler-ai-runtime-protection

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 Zscaler AI Runtime Protection: 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