HOL Guard vs NeMo Guardrails
An independent, evidence-based trust comparison of HOL Guard and NeMo Guardrails, two Security & Guardrails projects in the HVTracker registry. Scores come from public, checkable signals — supply-chain provenance, OSSF Scorecard, maintenance, and adoption — not popularity.
HOL Guard leads on trust — 88.5/100 (Grade A) vs 71.6/100 (Grade B), a 16.9-point gap. Note: HOL Guard's evidence coverage is thinner (coverage B vs A) — its score rests on fewer independent signal types. Full breakdown below.
| Signal | HOL Guardhashgraph-online/hol-guard | NeMo GuardrailsNVIDIA/NeMo-Guardrails |
|---|---|---|
| HVTrust score | 88.5 | 71.6 |
| Evidence grade | A | B |
| Coverage grade | B | A |
| Overall rank | #20 | #126 |
| Rank in Security & Guardrails | #1 | #4 |
| GitHub stars | 437 | 7.0k |
| Last updated | 1d ago | 2d ago |
| Build provenance | Yes | No |
| OSSF Scorecard | 7.6 / 10 | 6.4 / 10 |
| License | Apache-2.0 | NOASSERTION |
| Downloads | 30k/wk | 79k/wk |
| Trust dimensions (points earned) | ||
| Safety / integrity / 25 | 21.7 | 13.0 |
| Identity & provenance / 18 | 18.0 | 10.8 |
| Transparency / 17 | 15.0 | 13.9 |
| Maintenance / 20 | 19.9 | 18.1 |
| Adoption / 20 | 12.3 | 15.8 |
| Runtime capability surface (full matrix) | ||
| MCP server | Implemented | — |
| External providers | 3 — Anthropic, Google Gemini, Multi-provider (LiteLLM) | 1 — OpenAI |
| Requires API keys | Yes | No |
| Plugin surface | plugins | — |
| Provenance drift | Match | Unknown |
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HOL Guard profile
NeMo Guardrails profile
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How to read this: HVTrust (0–100) weighs supply-chain signals (provenance, OSSF Scorecard, signed commits, open license) alongside real-world adoption, scaled by an evidence-confidence factor. Grade bands: A ≥ 80, B ≥ 65, C ≥ 50, D < 50. Signals refresh daily. Full methodology v4.3 →