# NVIDIA NeMo Guardrails vs Guard — 40° South

> NeMo Guardrails is an open-source toolkit you build with. Guard is managed compliance infrastructure you switch on. Build versus buy.

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#  NVIDIA NeMo Guardrails vs Guard 

 NeMo Guardrails is an open-source toolkit you build with. Guard is managed compliance infrastructure you switch on. Build versus buy. 

Why this comes up

NVIDIA NeMo Guardrails is a capable open-source framework. You define conversational rails in a config language (Colang), and they run in-process inside your application to constrain LLM behaviour, block topics, enforce dialogue flows, and add programmable checks.

It’s powerful, and it’s a build. You write and maintain the rails, host the runtime, and keep the rules current as regulations change. Critically, you’d have to build Australian PII detection, cryptographic attestation, regulatory mapping, and a tamper-evident audit trail yourself. None of that ships in the box.

Guard is the buy side of that decision. One API URL and one key, and you get Australian PII detection with checksums, prompt injection detection, per-call signed attestations mapped to CPS 234 and the Privacy Act, and a 7-year evidence vault, maintained as the regulations change. For a regulated business, the question is whether compliance evidence is something you want to build and own, or simply switch on.

The difference

NeMo is a toolkit you build and run yourself. Guard is turnkey compliance infrastructure with one API change.

## Side by side

| Capability                                        | NeMo Guardrails | 40° South Guard |
| ------------------------------------------------- | --------------- | --------------- |
| Open-source and fully customisable                | ✓               | ✗               |
| Programmable conversational rails                 | ✓               | \~              |
| Turnkey: one API change to deploy                 | ✗               | ✓               |
| Australian personal data detection out of the box | ✗               | ✓               |
| Per-call signed proof                             | ✗               | ✓               |
| CPS 234 / Privacy Act regulatory mapping          | ✗               | ✓               |
| Managed 7-year tamper-evident audit trail         | ✗               | ✓               |
| Maintained as regulations change                  | self-managed    | ✓               |

✓ = supported · \~ = partial · ✗ = not supported 

Reflects publicly available information as at July 2026\. Tools change; check current vendor documentation. 

[ Download the full comparison (PDF) ](/downloads/guard-vs-nemo-guardrails.pdf) 

Could you run them together?

You can. If your engineering team already runs NeMo rails for application behaviour, keep them, and route calls through Guard for the compliance evidence NeMo doesn’t produce.

But for most regulated businesses, the appeal of Guard is not having to build and maintain the compliance layer at all.

## See Guard on your own AI calls 

Book a demo and we’ll show you a signed attestation for a real call, mapped to your obligations under CPS 234, the Privacy Act, and AI transparency. 

[Book a demo → ](/#get-started) [See all comparisons ](/compare)

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Markdown version of https://40south.au/compare/nemo-guardrails for AI readers. Site index for LLMs: https://40south.au/llms.txt