# Onyx Platform vs RealmGuard: side-by-side comparison (2026)

[Onyx Platform](https://cybersectools.com/tools/onyx-platform) is a commercial [agentic AI security](https://cybersectools.com/categories/agentic-ai-security) solution by [Onyx Security](https://cybersectools.com/companies/onyx-security). [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.

Need the answer fast? [Best Agentic AI Security Solutions for Business](https://cybersectools.com/shortlists/best-agentic-ai-security-solutions) picks CrowdStrike Falcon Guardian, Rubrik Agent Cloud, Silverfort AI Agent Security and 5 more.

## Side-by-side comparison

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

### Use cases and capabilities

| | Onyx Platform | RealmGuard |
|---|---|---|
| Agentic AI Security | Yes | – |
| AI Governance | Yes | Yes |
| AI Observability | Yes | – |
| AI SPM | Yes | – |
| LLM Guardrails | Yes | Yes |
| LLM Security | Yes | Yes |
| MCP Security | Yes | – |
| Prompt Injection | Yes | Yes |
| Shadow AI | Yes | – |
| GenAI Security | Yes | Yes |
| AI Firewall | – | Yes |
| Content Filtering | – | Yes |
| PII | – | Yes |
| AI Compliance | – | Yes |
| OWASP | – | Yes |

### Core features

**Onyx Platform**

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

**RealmGuard**

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

### Integrations

**Onyx Platform**

11 integrations 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.

- [RealmGuard](https://cybersectools.com/tools/realm-labs-platform) fits if you are a small business.

## Onyx Platform vs RealmGuard FAQ

Common questions when comparing Onyx Platform vs RealmGuard for agentic AI security.

### What is the difference between Onyx Platform and RealmGuard?

**Onyx Platform**: AI control plane for enterprise AI agent security, governance, and observability. Built by Onyx Security.

**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 Onyx Platform and RealmGuard?

**Onyx Platform** is made by Onyx Security. **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 Onyx Platform a good alternative to RealmGuard?

In part. Onyx Platform and RealmGuard are not in the same category on CybersecTools. Both cover LLM Guardrails, LLM Security, Prompt Injection. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [Onyx Platform vs BeyondGuard](https://cybersectools.com/compare/beyondguard-vs-onyx-platform)
- [Onyx Platform vs HikmaAI](https://cybersectools.com/compare/hikmaai-vs-onyx-platform)
- [Onyx Platform vs Certiv](https://cybersectools.com/compare/certiv-vs-onyx-platform)
- [RealmGuard vs BeyondGuard](https://cybersectools.com/compare/beyondguard-vs-realm-labs-platform)
- [RealmGuard vs HikmaAI](https://cybersectools.com/compare/hikmaai-vs-realm-labs-platform)
- [RealmGuard vs Certiv](https://cybersectools.com/compare/certiv-vs-realm-labs-platform)

## Alternatives to each

- [See all Onyx Platform alternatives](https://cybersectools.com/alternatives/onyx-platform)
- [See all RealmGuard alternatives](https://cybersectools.com/alternatives/realm-labs-platform)

---

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

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/onyx-platform.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Onyx Platform 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