Prova vs NeMo Guardrails
NeMo Guardrails gives you a scripting language for what the AI can say. Prova gives you a formal proof that the reasoning behind what it said is sound.
Try Prova freeNVIDIA NeMo Guardrails is an open-source toolkit for adding programmable rails to LLM applications. You write flows in Colang that constrain topic, dialog, and output. Prova is a formal reasoning verifier: no rails to script, no flows to author, just a certificate per argument chain proving (or disproving) structural validity.
| Feature | Prova | NeMo Guardrails |
|---|---|---|
| Requires authoring rails in Colang | No | Yes |
| Topic and dialog constraints | No | Yes |
| Formal reasoning verification | Yes | No |
| Works without any configuration | Yes | No |
| Circular reasoning detection | Yes | No |
| Contradiction detection | Yes | No |
| Signed certificates | Yes | No |
| Math-grounded verdict | Yes | No |
| Open source | No | Yes |
| NVIDIA integration | No | Yes |
Where Prova is different
No DSL to learn, no rails to maintain
NeMo Guardrails makes you script every flow in Colang and keep it in sync with your product. Prova is zero-configuration: point it at the reasoning chain and get a certificate. Works the same on day one and year three.
Catches what you did not anticipate
Rails only catch what the Colang author thought to constrain. Prova's formal graph analysis finds structural failures no rail would ever describe: a premise that supports itself, a conclusion with no path back to the inputs, a contradiction nested three levels deep.
Evidentiary certificates, not transcripts
NeMo Guardrails produces conversation transcripts and rail-hit logs. Prova produces cryptographically signed certificates with SHA-256 integrity hashes. For compliance, procurement, and litigation, that is the artifact auditors ask for by name.
Use NeMo Guardrails when you need programmable dialog control and tight topic constraints. Use Prova when you need a formal, signed certificate that the reasoning behind an output is logically valid. These are complements, not substitutes.