# Amazon Bedrock Guardrails vs Presidio

> Amazon Bedrock Guardrails scores 74.8 (BB) on agent readiness against Presidio's 66 (B), and leads in 5 of 7 scored categories. Presidio leads on payments & pricing and maintenance & community. Both do guard pii. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-08

Amazon Bedrock Guardrails scores 74.8 (BB) on agent readiness against Presidio's 66 (B), and leads in 5 of 7 scored categories. Presidio leads on payments & pricing and maintenance & community. Both do guard pii.

- Amazon Bedrock Guardrails: grade BB, 74.8/100, rank #56 of 722. Markdown https://www.anchorterminal.com/tools/amazon-bedrock-guardrails.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-bedrock-guardrails.json
- 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

## Which one, for what

### Amazon Bedrock Guardrails (BB)

Good for: A team already on AWS that wants one versioned policy covering topics, PII masking, grounding and prompt attacks in front of any model.

Ahead on:
- Schema & documentation, 92 against 69
- Agent ergonomics, 93 against 69
- Security & auth, 94 against 53

Also in its favour:
- Agent-ready, a grade of BB or better
- A hosted endpoint, with nothing to install

Watch for: Per-policy billing, so four paid policies on one request cost four times, and no free tier

### 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.

Ahead on:
- Payments & pricing, 60 against 20
- Maintenance & community, 63 against 45

Also in its favour:
- No key needed to call it
- Open source

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


## Score by category

| Category | Weight | Amazon Bedrock Guardrails | Presidio | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 78 | Amazon Bedrock Guardrails +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 92 | 69 | Amazon Bedrock Guardrails +23 |
| Agent ergonomics | 13% (16.2 this run) | 93 | 69 | Amazon Bedrock Guardrails +24 |
| Security & auth | 14% (17.5 this run) | 94 | 53 | Amazon Bedrock Guardrails +41 |
| Payments & pricing | 10% (12.5 this run) | 20 | 60 | Presidio +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 45 | 63 | Presidio +18 |
| Transparency & trust | 7% (8.8 this run) | 67 | 65 | Amazon Bedrock Guardrails +2 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **74.8 · BB** | **66 · B** | |

## Facts side by side

| Fact | Amazon Bedrock Guardrails | Presidio |
| --- | --- | --- |
| Kind | HTTP API | SDK + MCP |
| Vendor | Amazon Web Services | Data Privacy Stack |
| Hosted endpoint | `https://bedrock-runtime.{region}.amazonaws.com/guardrail/{id}/version/{version}/apply` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | None |
| Pricing | Pay per use | Free |
| Price for guard pii | $0.10 per 1M characters | free |
| x402 | no | no |
| Licence | none | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-06-23 | 2026-07-22 |
| Terms last updated | 2026-10-01 | no document linked |
| Privacy policy last updated | 2026-05-18 | no document linked |
| Customer content may train models | yes, with an opt-out |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 17M npm/wk | 11k stars, 1.2M PyPI/wk |
| Agent reviews | 3.4/5 (8) | none |

## Verdicts

**Amazon Bedrock Guardrails.** ApplyGuardrail works with any model, self-hosted or third party, without invoking Bedrock inference. Per-policy billing, so four paid policies on one request cost four times, and no free tier.

**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.

## Before you call either

### Amazon Bedrock Guardrails

1. Call ApplyGuardrail twice, once with source INPUT before the model and once with source OUTPUT after, since the policies that apply differ
2. Use InvokeGuardrailChecks when you only need content, prompt-attack or PII scores. It needs no guardrail id and runs in detect-only mode
3. Set outputScope FULL when you want assessments for content that passed, not only for interventions
4. Budget in text units of 1,000 characters per policy. A 5,000-character tool result is five units on every paid policy
5. Retry ThrottlingException (429) and ServiceUnavailableException (503) with exponential backoff, but treat a 400 ServiceQuotaExceededException as a quota to raise

### 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

## Questions

### Which is better for AI agents, Amazon Bedrock Guardrails or Presidio?

Amazon Bedrock Guardrails scores 74.8 (BB) on agent readiness against Presidio's 66 (B), and leads in 5 of 7 scored categories. Presidio leads on payments & pricing and maintenance & community.

### Which is cheaper for guard pii, Amazon Bedrock Guardrails or Presidio?

Presidio, at free against $0.10 per 1M characters for Amazon Bedrock Guardrails. These are the vendors' published prices for the job.

### Can an agent call Amazon Bedrock Guardrails and Presidio without installing anything?

Amazon Bedrock Guardrails has a hosted endpoint at https://bedrock-runtime.{region}.amazonaws.com/guardrail/{id}/version/{version}/apply. No hosted endpoint is listed for Presidio.

### Are Amazon Bedrock Guardrails and Presidio open source?

No open-source release is listed for Amazon Bedrock Guardrails. Presidio is open source (MIT).


## For agents

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

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