Prova vs NeMo Guardrails
NeMo Guardrails is a scripting language for what the AI can say. Prova is the policy, the enforcement, and the signed record, with no scripting.
BOOK A CALLNVIDIA NeMo Guardrails is an open-source toolkit for adding programmable rails to LLM apps: you write flows in Colang to constrain topic, dialog, and outputs. Prova is the AI control plane: a built-in policy library and detectors enforced at the gateway with no DSL to author, plus per-run verdicts, runtime boundaries, and Ed25519-signed receipts.
| Feature | Prova | NeMo Guardrails |
|---|---|---|
| Programmable dialog / topic rails (Colang) | No | Yes |
| Built-in policy library, no scripting | 19 policies | you author Colang |
| Gateway enforcement (block before the call) | Yes | in-app |
| Ed25519-signed receipts, verifiable offline | Yes | No |
| Per-run health verdict (loops, cost, repeated tools) | Yes | No |
| Coordination-loop detector (multi-agent) | Yes | No |
| Runtime autonomy boundaries (tools, steps, scopes) | Yes | No |
| EU AI Act / FDA / SEC / HIPAA evidence export | Yes | No |
| Open source | No | Yes |
| Self-hosted / air-gapped | Yes | Yes |
Where Prova is different
No DSL to author or maintain
NeMo makes you script and version flows in Colang and keep them in sync with the product. Prova ships a built-in policy library enforced at the gateway, with no rails to write.
A signed record of every decision
NeMo produces transcripts and rail-hit logs. Prova produces Ed25519-signed receipts with SHA-256 integrity, the artifact procurement and auditors ask for by name.
A verdict on the run, not just the turn
NeMo constrains a conversation turn. Prova scores the whole agent run, routes it pass / flag / needs-human, and bounds what it may do.
Use NeMo Guardrails for programmable dialog control and topic constraints. Use Prova for built-in policy enforcement, signed receipts, run verdicts, and boundaries. Complements, not substitutes.