# Promptfoo Guardrails vs Zscaler SPLX AI Runtime Threat Inspection: 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 SPLX AI Runtime Threat Inspection](https://cybersectools.com/tools/zscaler-splx-ai-runtime-threat-inspection) 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 SPLX AI Runtime Threat Inspection |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | LLM Guardrails | LLM Guardrails |
| Verified | No | No |
| Deployment type | Hybrid | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | Promptfoo | SPLX |
| Headquarters | – | – |

### Use cases and capabilities

| | Promptfoo Guardrails | Zscaler SPLX AI Runtime Threat Inspection |
|---|---|---|
| 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 SPLX AI Runtime Threat Inspection**

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

### Integrations

**Promptfoo Guardrails**

No integrations listed.

**Zscaler SPLX AI Runtime Threat Inspection**

5 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.
- [Zscaler SPLX AI Runtime Threat Inspection](https://cybersectools.com/tools/zscaler-splx-ai-runtime-threat-inspection) fits if you want a cloud product.

## Promptfoo Guardrails vs Zscaler SPLX AI Runtime Threat Inspection FAQ

Common questions when comparing Promptfoo Guardrails vs Zscaler SPLX AI Runtime Threat Inspection for LLM guardrails.

### What is the difference between Promptfoo Guardrails and Zscaler SPLX AI Runtime Threat Inspection?

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

**Zscaler SPLX AI Runtime Threat Inspection**: Analyzes AI interaction logs for near real-time threat detection in GenAI apps. Built by SPLX.

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

### Who makes Promptfoo Guardrails and Zscaler SPLX AI Runtime Threat Inspection?

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

Often, yes. Promptfoo Guardrails and Zscaler SPLX AI Runtime Threat Inspection 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 SPLX AI Runtime Threat Inspection vs RealmGuard](https://cybersectools.com/compare/realm-labs-platform-vs-zscaler-splx-ai-runtime-threat-inspection)
- [Zscaler SPLX AI Runtime Threat Inspection vs Confident Security](https://cybersectools.com/compare/confident-security-vs-zscaler-splx-ai-runtime-threat-inspection)
- [Zscaler SPLX AI Runtime Threat Inspection vs PointGuard AI Intelligent Guardrails](https://cybersectools.com/compare/pointguard-ai-intelligent-guardrails-vs-zscaler-splx-ai-runtime-threat-inspection)

## Alternatives to each

- [See all Promptfoo Guardrails alternatives](https://cybersectools.com/alternatives/promptfoo-guardrails)
- [See all Zscaler SPLX AI Runtime Threat Inspection alternatives](https://cybersectools.com/alternatives/zscaler-splx-ai-runtime-threat-inspection)

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Source: https://cybersectools.com/compare/promptfoo-guardrails-vs-zscaler-splx-ai-runtime-threat-inspection

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 SPLX AI Runtime Threat Inspection: 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