# LLM Guard vs RealmGuard: side-by-side comparison (2026)

[LLM Guard](https://cybersectools.com/tools/llm-guard) is a free [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution. [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

| | LLM Guard | RealmGuard |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | LLM Guardrails | LLM Guardrails |
| Verified | No | No |
| Deployment type | On-Premises | Hybrid |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| GitHub stars | 2,043 | – |
| Last commit | Sep 2025 | – |
| Company | – | Realm Labs |
| Headquarters | – | – |

### Use cases and capabilities

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

### Core features

**LLM Guard**

No features listed.

**RealmGuard**

10 features 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.

- [LLM Guard](https://cybersectools.com/tools/llm-guard) fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product.
- [RealmGuard](https://cybersectools.com/tools/realm-labs-platform) fits if you need both cloud and on-premises options.

## LLM Guard vs RealmGuard FAQ

Common questions when comparing LLM Guard vs RealmGuard for LLM guardrails.

### What is the difference between LLM Guard and RealmGuard?

**LLM Guard**: LLM Guard is a security toolkit that enhances the safety and security of interactions with Large Language Models (LLMs) by providing features like sanitization, harmful language detection, data leakage prevention, and resistance against prompt injection attacks.

**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 LLM Guard and RealmGuard?

**LLM Guard** is open-source with 2,043 GitHub stars. **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 LLM Guard a good alternative to RealmGuard?

Often, yes. LLM Guard and RealmGuard are both LLM Guardrails products, and both cover LLM Guardrails, LLM Security, Prompt Injection. Key differences: LLM Guard is Free while RealmGuard is Commercial, LLM Guard is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [LLM Guard vs Senthex AI Firewall](https://cybersectools.com/compare/llm-guard-vs-senthex-ai-firewall)
- [LLM Guard vs Promptfoo Guardrails](https://cybersectools.com/compare/llm-guard-vs-promptfoo-guardrails)
- [LLM Guard vs Vulcan Protect](https://cybersectools.com/compare/llm-guard-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 LLM Guard alternatives](https://cybersectools.com/alternatives/llm-guard)
- [See all RealmGuard alternatives](https://cybersectools.com/alternatives/realm-labs-platform)

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Source: https://cybersectools.com/compare/llm-guard-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/llm-guard.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on LLM Guard 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