# Operant AI AI Gatekeeper vs RealmGuard: side-by-side comparison (2026)

[Operant AI AI Gatekeeper](https://cybersectools.com/tools/operant-ai-ai-gatekeeper) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [Operant AI](https://cybersectools.com/companies/operant-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

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

### Use cases and capabilities

| | Operant AI AI Gatekeeper | RealmGuard |
|---|---|---|
| Cloud Native | Yes | – |
| Kubernetes | Yes | – |
| LLM Guardrails | – | Yes |
| LLM Security | – | Yes |
| Prompt Injection | – | Yes |
| AI Firewall | – | Yes |
| GenAI Security | – | Yes |
| Content Filtering | – | Yes |
| PII | – | Yes |
| AI Compliance | – | Yes |
| AI Governance | – | Yes |
| OWASP | – | Yes |

### Core features

**Operant AI AI Gatekeeper**

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

**RealmGuard**

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

### Integrations

**Operant AI AI Gatekeeper**

1 integration listed. Sign in on the page to see them.

**RealmGuard**

No integrations listed.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [Operant AI AI Gatekeeper](https://cybersectools.com/tools/operant-ai-ai-gatekeeper) fits if you want a cloud product.
- [RealmGuard](https://cybersectools.com/tools/realm-labs-platform) fits if you need both cloud and on-premises options and you are a small business.

## Operant AI AI Gatekeeper vs RealmGuard FAQ

Common questions when comparing Operant AI AI Gatekeeper vs RealmGuard for LLM guardrails.

### What is the difference between Operant AI AI Gatekeeper and RealmGuard?

**Operant AI AI Gatekeeper**: Runtime AI security platform protecting GenAI apps from models to APIs. Built by Operant 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 Operant AI AI Gatekeeper and RealmGuard?

**Operant AI AI Gatekeeper** is made by Operant 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 Operant AI AI Gatekeeper a good alternative to RealmGuard?

Often, yes. Operant AI AI Gatekeeper and RealmGuard are both LLM Guardrails products. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Operant AI AI Gatekeeper vs Senthex AI Firewall](https://cybersectools.com/compare/operant-ai-ai-gatekeeper-vs-senthex-ai-firewall)
- [Operant AI AI Gatekeeper vs Promptfoo Guardrails](https://cybersectools.com/compare/operant-ai-ai-gatekeeper-vs-promptfoo-guardrails)
- [Operant AI AI Gatekeeper vs Confident Security](https://cybersectools.com/compare/confident-security-vs-operant-ai-ai-gatekeeper)
- [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 Confident Security](https://cybersectools.com/compare/confident-security-vs-realm-labs-platform)

## Alternatives to each

- [See all Operant AI AI Gatekeeper alternatives](https://cybersectools.com/alternatives/operant-ai-ai-gatekeeper)
- [See all RealmGuard alternatives](https://cybersectools.com/alternatives/realm-labs-platform)

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Source: https://cybersectools.com/compare/operant-ai-ai-gatekeeper-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/operant-ai-ai-gatekeeper.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Operant AI AI Gatekeeper 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