NVIDIA NeMo Guardrails
NVIDIA NeMo Guardrails: A free, self-hosted toolkit for adding runtime safety and policy controls to LLM apps. Ranked #45 of 49 in LLM Application Development Frameworks by our editors (4.9/10); pricing: Free plan; best for teams adding runtime safety controls to LLM apps.
At a glance
- Editor score4.9 / 10
- PricingFree plan
- Best forTeams adding runtime safety controls to LLM apps
- Free planYes
- Paid fromNone
- Founded1993 · Santa Clara, California, United States
- Facts checked28 Sep 2026
Where it wins
- Controls inputs, retrieved content, tool calls, and model outputs
- Includes jailbreak detection, PII masking, content safety, and fact-checking
- Offers Python, OpenAI-compatible API, and LangChain/LangGraph integrations
Where it doesn't
- Requires a self-hosted deployment
- Adding guardrails is adjacent to, not a replacement for, app development
- Connected external model or API services may have separate costs
Our verdict on NVIDIA NeMo Guardrails
NVIDIA NeMo Guardrails is an open-source Python toolkit for adding configurable safety and policy controls to LLM applications and agents. Teams can define programmable rails with YAML and Colang to evaluate user inputs, retrieved content, tool calls, and model outputs. It is aimed at developers who want to govern runtime behavior in an existing LLM application, rather than a framework centered on building the application itself. Its free Apache License 2.0 library makes it accessible across small, mid-market, and enterprise teams, provided they can operate a self-hosted component.
The controls cover several points in an application flow: jailbreak and prompt-attack detection, topic enforcement, sensitive-data detection and masking, content-safety moderation, tool-call validation, and hallucination or fact-checking guardrails. Developers can connect through a Python SDK, an OpenAI-compatible guardrails API server, or integrations with LangChain and LangGraph. OpenTelemetry traces, metrics, and logs provide observability. This breadth is useful when a team needs policy checks across both conversational responses and agent actions; it also means the toolkit serves as a safety layer, not a complete application-development environment.
Deployment is self-hosted, with Windows, macOS, and Linux among the listed platforms. The library itself is free, but external model or API services it connects to may carry separate costs, so the total operating expense depends partly on those services. The listed support channel is documentation. NeMo Guardrails fits teams prepared to configure and run a Python-based component and wanting controls that can extend across multiple stages of an LLM workflow. Teams seeking a managed service or a framework focused primarily on constructing applications may prefer a different approach.
NVIDIA NeMo Guardrails pricing
NVIDIA NeMo Guardrails fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Primary language | Not verified |
| RAG support | Not verified |
| Agent and tool use | Not verified |
| Workflow graphs | Not verified |
| Prompt optimization | Not verified |
| Open-source license | Not verified |
| JavaScript/TypeScript SDK | Not verified |
| Deployment | Self-hosted |
| Platforms | Windows, macOS, Linux |
| Support | Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 9 integrations: LangChain, LangGraph, OpenTelemetry, Presidio, Private AI, Prompt Security … |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 28 Sep 2026 |
NVIDIA NeMo Guardrails integrations
NVIDIA NeMo Guardrails lists 9 integrations on its own site.
- LangChain
- LangGraph
- OpenTelemetry
- Presidio
- Private AI
- Prompt Security
- Pangea AI Guard
- ActiveFence
- Cisco AI Defense
Alternatives to NVIDIA NeMo Guardrails
- LangChainA self-hosted framework for LLM apps, retrieval workflows, and agents.9.4
- LangGraphGraph-based control for developers who need durable, stateful agent workflows.9.2
- Microsoft Agent FrameworkAn open-source framework for multi-agent orchestration, with checkpoints and approval gates.9.1
See all NVIDIA NeMo Guardrails alternatives →
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