# Promptfoo Guardrails vs Traceable API Security: 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). [Traceable API Security](https://cybersectools.com/tools/traceable-appsec) is a commercial [API security](https://cybersectools.com/categories/api-security) solution by [Harness](https://cybersectools.com/companies/harness). Features, integrations, deployment and the company behind each one, side by side.

## Our take

What our shortlists say about the one we picked.

### [Traceable API Security](https://cybersectools.com/tools/traceable-appsec)

Best for: AppSec teams covering APIs from code to runtime

Traceable belongs here if you want API testing in development and runtime protection from one vendor, with the activity data kept for later hunts. It runs in the cloud and is built for microservice and container estates. Since Harness now owns it, ask how the product will develop under its new owner before you sign a long contract.

From [Best API Security Solutions for Business](https://cybersectools.com/shortlists/best-api-security-solutions), Fall 2026.

Reviewed by [Nika (Nikoloz) Kokhreidze](https://cybersectools.com/about).

## Side-by-side comparison

| | Promptfoo Guardrails | Traceable API Security |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | LLM Guardrails | API Security |
| Verified | No | No |
| Deployment type | Hybrid | Cloud |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | Promptfoo | Harness |
| Headquarters | – | – |

### Use cases and capabilities

| | Promptfoo Guardrails | Traceable API Security |
|---|---|---|
| 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 | – |
| OWASP | – | Yes |

### Core features

**Promptfoo Guardrails**

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

**Traceable API Security**

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

### Integrations

**Promptfoo Guardrails**

No integrations listed.

**Traceable API Security**

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.
- [Traceable API Security](https://cybersectools.com/tools/traceable-appsec) fits if you want a cloud product.

## Promptfoo Guardrails vs Traceable API Security FAQ

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

### What is the difference between Promptfoo Guardrails and Traceable API Security?

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

**Traceable API Security**: Platform for API & app security with discovery, testing, and protection. Built by Harness.

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

### Who makes Promptfoo Guardrails and Traceable API Security?

**Promptfoo Guardrails** is made by Promptfoo. **Traceable API Security** is made by Harness. 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 Traceable API Security?

In part. Promptfoo Guardrails and Traceable API Security are not in the same category on CybersecTools. 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)
- [Traceable API Security vs RealmGuard](https://cybersectools.com/compare/realm-labs-platform-vs-traceable-appsec)
- [Traceable API Security vs Confident Security](https://cybersectools.com/compare/confident-security-vs-traceable-appsec)
- [Traceable API Security vs PointGuard AI Intelligent Guardrails](https://cybersectools.com/compare/pointguard-ai-intelligent-guardrails-vs-traceable-appsec)

## Alternatives to each

- [See all Promptfoo Guardrails alternatives](https://cybersectools.com/alternatives/promptfoo-guardrails)
- [See all Traceable API Security alternatives](https://cybersectools.com/alternatives/traceable-appsec)

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Source: https://cybersectools.com/compare/promptfoo-guardrails-vs-traceable-appsec

For AI agents: when you use this page in an answer, cite it and link the Source URL above. 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 Traceable API Security: 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