NeMo Guardrails
NVIDIA toolkit for programmable guardrails via Colang language
Verdict
Unique dialogue-flow approach using Colang DSL. Best for complex multi-turn conversation policies. Steeper learning curve than Guardrails AI but richer for conversation steering.
Other Guardrails & Safety
- Anthropic Constitutional AIStable
Principle-based self-improvement for harmlessness and helpfulness
- Azure AI Content SafetyProduction
Microsoft's content moderation API for text and images
- Guardrails AIStable
Add input/output validation and safety rails to LLM calls
- Lakera GuardStable
Real-time prompt injection and jailbreak protection API
- Llama Guard 3Experimental
Meta's fine-tuned safety classifier for prompt and response screening
- Microsoft PresidioProduction
Data protection and anonymization for PII in LLM pipelines

