Best Open-Source Security & Guardrails: NeMo Guardrails vs Garak
A data-backed comparison of the top two security & guardrails on HVTracker, built from public trust signals rather than stars alone.
Short answer: NeMo Guardrails currently leads Garak on HVTracker's evidence-weighted trust score: 71.8 vs 67.0/100. This is not a popularity ranking; it combines supply-chain safety, identity/provenance, transparency, maintenance, and adoption signals.
NeMo Guardrails
NeMo Guardrails is an open-source toolkit for easily adding programmable guardrails to LLM-based conversational systems.
Garak
the LLM vulnerability scanner
NeMo Guardrails vs Garak: trust signal breakdown
Both projects are tracked in the Security & Guardrails category, but they do not expose the same evidence. The table below compares the public signals that feed HVTrust.
| Signal | NeMo Guardrails | Garak |
|---|---|---|
| HVTrust score | 71.8 | 67.0 |
| Safety / Integrity | 16.2/30 | 12.6/30 |
| Identity / Provenance | 12.0/20 | 12.0/20 |
| Transparency | 16.8/20 | 15.1/20 |
| Maintenance | 19.0/20 | 19.9/20 |
| Adoption | 7.8/10 | 7.4/10 |
| OSSF Scorecard | 6.8 | 5.1 |
| Signed commits | 100% | 82% |
| Package provenance | Not detected | Not detected |
Which one should you evaluate first?
If your priority is the most verifiable trust profile today, start with NeMo Guardrails. It has the stronger current HVTrust score and ranks higher in Security & Guardrails. If your use case depends on a specific runtime, language, license, or integration model, use the individual profiles rather than the headline score alone.
For production use, the practical checklist is: inspect the security policy, confirm package provenance or release signing where available, review recent maintenance cadence, and compare the exact trust breakdown. HVTracker is meant to reduce the first-pass research burden, not replace your own risk review.