# Fiddler Guardrails vs RealmGuard: side-by-side comparison (2026)

[Fiddler Guardrails](https://cybersectools.com/tools/fiddler-guardrails) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [Fiddler AI](https://cybersectools.com/companies/fiddler-ai). [RealmGuard](https://cybersectools.com/tools/realm-labs-platform) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [Realm Labs](https://cybersectools.com/companies/realm-labs). Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | Fiddler Guardrails | RealmGuard |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | LLM Guardrails | LLM Guardrails |
| Verified | No | No |
| Deployment type | Hybrid | Hybrid |
| Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | Fiddler AI | Realm Labs |
| Headquarters | – | – |

### Use cases and capabilities

| | Fiddler Guardrails | RealmGuard |
|---|---|---|
| Content Filtering | Yes | Yes |
| Generative AI | Yes | – |
| LLM Guardrails | – | Yes |
| LLM Security | – | Yes |
| Prompt Injection | – | Yes |
| AI Firewall | – | Yes |
| GenAI Security | – | Yes |
| PII | – | Yes |
| AI Compliance | – | Yes |
| AI Governance | – | Yes |
| OWASP | – | Yes |

### Core features

**Fiddler Guardrails**

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

**RealmGuard**

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

### Integrations

**Fiddler Guardrails**

7 integrations listed. Sign in on the page to see them.

**RealmGuard**

No integrations listed.

## Fiddler Guardrails vs RealmGuard FAQ

Common questions when comparing Fiddler Guardrails vs RealmGuard for LLM guardrails.

### What is the difference between Fiddler Guardrails and RealmGuard?

**Fiddler Guardrails**: Guardrails for protecting LLM and agentic applications from harmful content. Built by Fiddler AI.

**RealmGuard**: AI guardrail platform detecting harmful outputs, prompt injections & policy violations. Built by Realm Labs.

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

### Who makes Fiddler Guardrails and RealmGuard?

**Fiddler Guardrails** is made by Fiddler AI. **RealmGuard** is made by Realm Labs. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is Fiddler Guardrails a good alternative to RealmGuard?

Often, yes. Fiddler Guardrails and RealmGuard are both LLM Guardrails products, and both cover Content Filtering. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Fiddler Guardrails vs Senthex AI Firewall](https://cybersectools.com/compare/fiddler-guardrails-vs-senthex-ai-firewall)
- [Fiddler Guardrails vs Promptfoo Guardrails](https://cybersectools.com/compare/fiddler-guardrails-vs-promptfoo-guardrails)
- [Fiddler Guardrails vs Vulcan Protect](https://cybersectools.com/compare/fiddler-guardrails-vs-vulcan-protect)
- [RealmGuard vs Senthex AI Firewall](https://cybersectools.com/compare/realm-labs-platform-vs-senthex-ai-firewall)
- [RealmGuard vs Promptfoo Guardrails](https://cybersectools.com/compare/promptfoo-guardrails-vs-realm-labs-platform)
- [RealmGuard vs Vulcan Protect](https://cybersectools.com/compare/realm-labs-platform-vs-vulcan-protect)

## Alternatives to each

- [See all Fiddler Guardrails alternatives](https://cybersectools.com/alternatives/fiddler-guardrails)
- [See all RealmGuard alternatives](https://cybersectools.com/alternatives/realm-labs-platform)

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Source: https://cybersectools.com/compare/fiddler-guardrails-vs-realm-labs-platform

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

More on Fiddler Guardrails and RealmGuard: 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