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Comparison

LLM Guard vs NeMo Guardrails

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

LLM Guard

Open-source security toolkit for sanitizing LLM inputs and outputs.

  • + 35+ built-in scanners covering PII, injection, toxicity, secrets
  • + Self-hosted middleware with input and output scanning
  • − Cannot guarantee 100% detection of novel attacks
  • − Adds latency to every LLM call

NeMo Guardrails

NVIDIA's open-source toolkit for LLM guardrails.

  • + Programmable rails for topic, safety, and security
  • + Backed by NVIDIA with active development
  • − Colang DSL adds a learning curve
  • − Heavier than lightweight scanner libraries
Spec LLM Guard NeMo Guardrails
Role Guardrails Guardrails
Tags guardrails, persona-platform-engineer guardrails, persona-platform-engineer
License MIT Apache-2.0
Open source Yes Yes
Self-hostable Yes Yes
MCP support No No
Pricing free free
Price Free Free
Usage cost No model cost No model cost
Models multi multi
Languages python python
GitHub stars 3.1k 6.6k
Last activity 2025-12-15 2026-07-03