NVIDIA NeMo Guardrails
Top pickWrite your policy as rails, in a language built for it.
92
sovereigntyNeMo Guardrails lets you define conversational policy in Colang, a purpose-built language for expressing what a bot may and may not do — topics it must refuse, flows it must follow, checks that run before a response reaches the user. That is a different and more useful primitive than a content classifier: your policy is usually about your domain, not about universal categories. It supports input, output, dialogue, retrieval and execution rails, runs entirely on your infrastructure, and is Apache-2.0.
OPEN SOURCEApache-2.0SELF-HOSTLOCAL-FIRST
LicenseApache-2.0
PricingFree and Apache-2.0. Runs wherever you run it.
Open sourceYes
Self-hostableYes
Local-first dataYes
What it does well
- +Express domain-specific policy directly, not via fixed categories
- +Rails at every stage: input, dialogue, retrieval, execution, output
- +Runs fully on your infrastructure — nothing leaves the network
- +Apache-2.0, backed by NVIDIA
Where it falls short
- −Colang is a new language to learn
- −Rails that call a model add latency of their own
- −Weaker out-of-the-box classification than a trained moderation model
NVIDIA NeMo Guardrails as an alternative to
Where NVIDIA NeMo Guardrails shows up in our comparisons, and how it ranked.
NVIDIA NeMo Guardrails head-to-head
Straight comparisons against the tools people weigh it against.