# Arthur Shield vs Rebuff

**Leader by vioscaleAI score:** Arthur Shield

| Attribute | Arthur Shield | Rebuff |
|---|---|---|
| **vioscaleAI score** | 62.6 (54% (medium)) | 36.5 (24% (low)) |
| activity.commits_last_30d | - | 0 |
| adoption.dependent_repos | - | 1 |
| adoption.github_stars | - | 1,529 |
| content.faq | `[{"answer":"A platform that locates and provides continuous monitoring of AI agents deployed across cloud and on-premises environments, offering security controls, audit capabilities, behavioral analysis, and policy enforcement. It is indexed under AI Guardrails.","source":"https://www.arthur.ai","question":"What is Arthur Shield?","confidence":0.6},{"answer":"Arthur Shield does not publish its prices. Pricing is quoted on request, across 2 plans (Free and Enterprise), so the figure depends on your seat count and requirements. We record this as a pricing-transparency signal rather than guessing a number. Pricing changes often, so verify at source before relying on it.","source":"https://www.arthur.ai","question":"How much does Arthur Shield cost?","confidence":0.6},{"answer":"We have confirmed browser-based access to Arthur Shield. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.arthur.ai/pricing-2025","question":"What platforms does Arthur Shield support?","confidence":0.6},{"answer":"Yes. Arthur Shield can be deployed cloud / SaaS, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://www.arthur.ai","question":"Can Arthur Shield be self-hosted?","confidence":0.6},{"answer":"We have confirmed 6 integrations for Arthur Shield, including OpenTelemetry, Snowflake, AWS Bedrock, Google Vertex AI, MCP and Claude Code. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.arthur.ai/pricing-2025","question":"What does Arthur Shield integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 and GDPR for Arthur Shield. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Arthur Shield not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.arthur.ai/blog/eu-ai-act-compliance-for-ai-agents","question":"What security certifications does Arthur Shield have?","confidence":0.7},{"answer":"Arthur Shield is available worldwide. Its primary market is the United States.","source":"https://www.arthur.ai/pricing-2025","question":"Where is Arthur Shield available?","confidence":0.5}]` | `[{"answer":"A framework that protects AI systems from prompt injection attacks through four defense mechanisms: input heuristics, LLM-based analysis, vector database pattern recognition, and canary token detection. Currently in alpha/prototype stage. It is indexed under AI Guardrails.","source":"https://github.com/pricing","question":"What is Rebuff?","confidence":0.6},{"answer":"Rebuff offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.","source":"https://github.com/pricing","question":"Is Rebuff free?","confidence":0.6},{"answer":"Rebuff supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://github.com/pricing","question":"What platforms does Rebuff support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Rebuff, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://github.com/pricing","question":"Can Rebuff be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for Rebuff, including OpenAI, Supabase and Pinecone. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://github.com/pricing","question":"What does Rebuff integrate with?","confidence":0.6},{"answer":"Yes. Rebuff is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/protectai/rebuff","question":"Is Rebuff open source?","confidence":0.95},{"answer":"Rebuff is available worldwide. Its primary market is the United States.","source":"https://github.com/pricing","question":"Where is Rebuff available?","confidence":0.5}]` |
| deployment.options | `{"cloud":true,"on_prem":true,"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | An open-source tool designed to enforce safety guardrails in AI/ML workloads, detect quality issues like data leakage and hallucinations in real-time, manage prompts across applications, and monitor model performance and RAG pipelines. | A framework that protects AI systems from prompt injection attacks through four defense mechanisms: input heuristics, LLM-based analysis, vector database pattern recognition, and canary token detection. Currently in alpha/prototype stage. |
| features.capabilities | `{"iso_27001":false,"soc2_type_ii":true,"pricing_model":"flat_enterprise_tier","architecture_model":"managed_cloud_inline_proxy","rag_retrieval_chunk_poisoning_defense":true,"prompt_injection_and_jailbreak_blocking":true,"inbound_pii_and_credit_card_masking_redaction":true,"streaming_token_interception_and_chunked_eval":true,"sub_50ms_latency_guarantees_for_proxy_routing":false,"custom_regex_and_deterministic_denylist_rulesets":true,"outbound_toxicity_and_competitor_mention_blocking":true,"zero_data_retention_and_prompt_privacy_guarantees":false,"hallucination_and_topical_off_brand_drift_detection":true}` | `{"architecture_model":"managed_cloud_inline_proxy","prompt_injection_and_jailbreak_blocking":true,"custom_regex_and_deterministic_denylist_rulesets":true,"zero_data_retention_and_prompt_privacy_guarantees":false}` |
| integrations.count | 7 | 3 |
| integrations.list | `[{"name":"OpenTelemetry"},{"name":"Snowflake"},{"name":"AWS Bedrock"},{"name":"Google Vertex AI"},{"name":"AWS"},{"name":"MCP"},{"name":"Claude Code"}]` | `[{"name":"OpenAI"},{"name":"Supabase"},{"name":"Pinecone"}]` |
| language.primary | - | TypeScript |
| license.spdx | - | Apache-2.0 |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"hybrid","plans":[{"free":true,"name":"Free","description":"Free version of Arthur Platform for monitoring and governing AI workloads","contactSales":false},{"free":false,"name":"Enterprise","description":"Enterprise version with enhanced performance, additional features, and capabilities","contactSales":true}],"summary":"Free tier available; enterprise pricing by quote","freeTier":true,"sourceUrl":"https://www.arthur.ai","retrievedAt":"2026-09-10T09:12:23.418Z"}` | `{"type":"open_source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-09-14T09:22:59.302Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | free | commercial |
| pricing.price_level | free | free |
| pricing.starting_price | `{"amount":60,"currency":"USD"}` | - |
| pricing.transparent | yes | no |
| release.history | - | `[{"url":"https://github.com/protectai/rebuff/releases/tag/v0.1.1","date":"2024-01-20T01:11:48Z","type":"stable","version":"v0.1.1"},{"url":"https://github.com/protectai/rebuff/releases/tag/v0.1.0","date":"2024-01-20T01:03:53Z","type":"stable","version":"v0.1.0"},{"url":"https://github.com/protectai/rebuff/releases/tag/v0.0.6","date":"2024-01-20T00:48:23Z","type":"stable","version":"v0.0.6"}]` |
| security.gdpr | yes | - |
| security.soc2 | yes | - |
| security.trust_center | - | https://github.com/security |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=rebuff&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (AI Guardrails)

| Capability | Arthur Shield | Rebuff |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Architecture model | Managed cloud inline proxy | Managed cloud inline proxy |
| Prompt injection and jailbreak blocking | ✓ | ✓ |
| Inbound pii and credit card masking redaction | ✓ | - |
| Outbound toxicity and competitor mention blocking | ✓ | - |
| Hallucination and topical off brand drift detection | ✓ | - |
| Sub 50ms latency guarantees for proxy routing | ✗ | - |
| Custom regex and deterministic denylist rulesets | ✓ | ✓ |
| Streaming token interception and chunked eval | ✓ | - |
| Rag retrieval chunk poisoning defense | ✓ | - |
| Zero data retention and prompt privacy guarantees | ✗ | ✗ |
| SOC2 type ii | ✓ | - |
| ISO 27001 | ✗ | - |
| Pricing model | Flat enterprise tier | - |

*Source: vioscaleAI. Generated 2026-10-16T18:31:16.906Z. "-" = undocumented, not absent.*