# Presidio vs NVIDIA NeMo Guardrails

> NVIDIA NeMo Guardrails scores 68.4 (B) on agent readiness against Presidio's 66 (B), and leads in 3 of 7 scored categories. Both do guard pii. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/microsoft-presidio-vs-nemo-guardrails
- Markdown: https://www.anchorterminal.com/compare/microsoft-presidio-vs-nemo-guardrails.md (~2,100 tokens)
- Slim: https://www.anchorterminal.com/compare/microsoft-presidio-vs-nemo-guardrails.min.md (~580 tokens, same facts, less prose, for token-sensitive contexts)
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

NVIDIA NeMo Guardrails scores 68.4 (B) on agent readiness against Presidio's 66 (B), and leads in 3 of 7 scored categories. Both do guard pii.

- Presidio: grade B, 66/100, rank #248 of 722. Markdown https://www.anchorterminal.com/tools/microsoft-presidio.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-presidio.json
- NVIDIA NeMo Guardrails: grade B, 68.4/100, rank #179 of 722. Markdown https://www.anchorterminal.com/tools/nemo-guardrails.md · JSON https://www.anchorterminal.com/api/v1/tools/nemo-guardrails.json

## Which one, for what

### Presidio (B)

Good for: Detecting and masking personal data in prompts, outputs, logs and images on the owner's own machines, with detection tuned by entity, threshold and custom recognisers.

Watch for: The REST containers have no authentication by design. The FAQ says to put a gateway or proxy in front

### NVIDIA NeMo Guardrails (B)

Good for: Teams that want to compose several checks (their own, NVIDIA's and third-party APIs) behind one OpenAI-compatible endpoint.

Ahead on:
- Security & auth, 62 against 53
- Maintenance & community, 80 against 63

Watch for: Usage telemetry and a heartbeat every 10 minutes to NVIDIA by default


## Score by category

| Category | Weight | Presidio | NVIDIA NeMo Guardrails | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 78 | 75 | Presidio +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 69 | 69 | even |
| Agent ergonomics | 13% (16.2 this run) | 69 | 67 | Presidio +2 |
| Security & auth | 14% (17.5 this run) | 53 | 62 | NVIDIA NeMo Guardrails +9 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 80 | NVIDIA NeMo Guardrails +17 |
| Transparency & trust | 7% (8.8 this run) | 65 | 68 | NVIDIA NeMo Guardrails +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **66 · B** | **68.4 · B** | |

## Facts side by side

| Fact | Presidio | NVIDIA NeMo Guardrails |
| --- | --- | --- |
| Kind | SDK + MCP | Agent framework |
| Vendor | Data Privacy Stack | NVIDIA |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | HTTP | HTTP |
| Auth | None | None |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-07-22 | 2026-09-16 |
| Terms last updated | no document linked | couldn't be read |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models |  | couldn't be read |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Popularity | 11k stars, 1.2M PyPI/wk | 7.2k stars, 101k PyPI/wk |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Presidio.** MIT-licensed personal data detector with a public OpenAPI document, tests on Python 3.10 to 3.14 and about 1.2 million weekly PyPI downloads. The REST containers have no authentication, the project states no SLA or support, and it covers personal data only, with no prompt injection or content moderation checks.

**NVIDIA NeMo Guardrails.** Apache-2.0, 7,200 stars and nine releases between 9 October 2025 and 16 September 2026. Usage telemetry and a heartbeat every 10 minutes to NVIDIA by default.

## Before you call either

### Presidio

1. Install from PyPI or pull images from ghcr.io/data-privacy-stack. The mcr.microsoft.com/presidio-* images are no longer updated
2. Download a spaCy model (python -m spacy download en_core_web_lg) before the first `AnalyzerEngine()` call, or use the Docker image
3. Send both text and language to `/analyze`. A request missing either returns HTTP 500 with a JSON error field
4. Pass entities and score_threshold to limit results. Many country-specific recognisers are disabled by default and need enabling in the registry YAML
5. Keep the containers on a private network or behind your own authenticating proxy. They accept any caller

### NVIDIA NeMo Guardrails

1. Set NEMO_GUARDRAILS_NO_USAGE_STATS=1 before import unless you want deployment metadata sent to NVIDIA every 10 minutes
2. Use IORails for plain input and output checks. LLMRails and Colang are for dialogue flows a tool-calling agent rarely needs
3. Pin nemoguardrails==0.24.1. 0.24.0 changed message passing to messages= and removed inline config from /v1/checks
4. Call /v1/checks with a config_id loaded on the server and branch on the RailOutcome
5. Put the server behind your own gateway. It has no auth or rate limiting

## Questions

### Which is better for AI agents, Presidio or NVIDIA NeMo Guardrails?

NVIDIA NeMo Guardrails scores 68.4 (B) on agent readiness against Presidio's 66 (B), and leads in 3 of 7 scored categories.

### Are Presidio and NVIDIA NeMo Guardrails open source?

Yes. Presidio is open source (MIT). NVIDIA NeMo Guardrails is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/microsoft-presidio-vs-nemo-guardrails.json, and with the fewest tokens: https://www.anchorterminal.com/compare/microsoft-presidio-vs-nemo-guardrails.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "microsoft-presidio", "b": "nemo-guardrails"}`. From a terminal: `anchor compare microsoft-presidio nemo-guardrails`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/microsoft-presidio.json and https://www.anchorterminal.com/api/v1/tools/nemo-guardrails.json

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