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Arthur

arthur.ai

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Spec score 8.4 #1 of 29 in AI Model Explainability Software

What it is

Arthur helps enterprises find AI agents across their environments and provides tools to observe and govern them. Discovery sensors monitor OpenTelemetry streams, MCP servers, network traffic, cloud APIs, and employee endpoints. The platform traces agent steps, tool calls, retrieved context, costs, latency, and behavior over time. Its governance features apply machine-checkable policies and provide real-time guardrail verdicts for prompt injection, PII exposure, restricted models, and off-policy tool use. Deployment options include hosted SaaS, on-premises, and hybrid; for hybrid setups, the evals engine runs beside customer workloads so sensitive data stays in the environment. Arthur lists RBAC, SSO, and deployed engineering support with every deployment option. Documented integrations include OpenAI, Anthropic, LangChain, LiteLLM, CrewAI, LlamaIndex, OpenAI Agents, Google ADK, AWS Bedrock, and Mastra. The Free plan is free, with up to four use cases, two projects, and seven-day data retention. Premium is $60 a month; Enterprise pricing is custom.

Spec sheet

Product
Arthur discovers agents across enterprise environments and provides a common framework to observe and govern them.Read 30 Sep 2026 · arthur.ai
Deployment
Arthur offers hosted SaaS, on-premises, and hybrid deployment options; its hybrid evals engine runs next to customer workloads so sensitive data stays in the environment.Read 30 Sep 2026 · arthur.ai
Integrations
Documented integrations include OpenAI, Anthropic, LangChain, LiteLLM, CrewAI, LlamaIndex, OpenAI Agents, Google ADK, AWS Bedrock, and Mastra.Read 30 Sep 2026 · docs.arthur.ai
Headquarters
Arthur’s privacy policy identifies the company as headquartered in Washington, DC.Read 30 Sep 2026 · arthur.ai
Company history
Arthur’s founder wrote that the company was founded about two years before its December 2020 Series A announcement.Read 30 Sep 2026 · arthur.ai
Data connectors
The documented platform connectors include BigQuery, Google Cloud Storage, Amazon S3, and Arthur Shield instances.Read 30 Sep 2026 · docs.arthur.ai
Discovery
Its discovery sensors monitor OpenTelemetry streams, MCP servers, network traffic, cloud APIs, and employee endpoints.Read 30 Sep 2026 · arthur.ai
Enterprise support
The Enterprise plan includes a dedicated customer success manager and advanced monitoring, SSO, SLAs, and BAA.Read 30 Sep 2026 · arthur.ai
Evaluation engine
Arthur’s open-source Evals Engine includes built-in PII, sensitive-data, custom-LLM, and regex rules and supports self-serve deployment.Read 30 Sep 2026 · arthur.ai
Free-tier limits
The Free plan includes monitoring for up to 4 use cases, unlimited seats, 2 projects, and 7 days of data retention.Read 30 Sep 2026 · arthur.ai
Governance
The platform supports machine-checkable policies and real-time guardrail verdicts for prompt injection, PII exposure, restricted models, and off-policy tool use.Read 30 Sep 2026 · arthur.ai
Observability
Arthur traces agent steps, tool calls, retrieved context, costs, latency, and behavior over time.Read 30 Sep 2026 · arthur.ai
Security controls
Arthur states that RBAC, SSO, and deployed engineering support come with every deployment option.Read 30 Sep 2026 · arthur.ai

Plans and prices

Free Free $0/mo Up to 4 use cases · 1 organization · 1 workspace · 2 projects · 7-day data retention · 5k jobs · 300k spans · 12k inferences · 3k evals Read 30 Sep 2026 · arthur.ai
Premium $60 a month $60/mo Up to 100 use cases · 1 organization · 1 workspace · 10 projects · 30-day data retention · 20k jobs · 1.2M spans · 100k inferences · 75k evals Read 30 Sep 2026 · arthur.ai
Enterprise Priced on request Custom Unlimited organizations, workspaces, projects, and data retention · Custom jobs, spans, inferences, and evals · Dedicated and managed VPC options · SSO, SLAs, and BAA Read 30 Sep 2026 · arthur.ai

Every Arthur plan and price →

Strong points and limits

Strong points

  • Monitors multiple agent discovery sources.
  • Traces agent steps, calls, costs, and latency.
  • Provides real-time policy guardrail verdicts.
  • Offers hosted, on-premises, and hybrid deployment.
  • Free plan includes unlimited seats.

Limits

  • Free plan is limited to four use cases.
  • Free plan includes two projects.
  • Free plan retains data for seven days.
  • Enterprise pricing is custom.

Who it suits

Arthur suits enterprises that need to discover, monitor, and govern AI agents across varied environments. Its hosted, on-premises, and hybrid options give teams different deployment choices.

Verdict

Arthur combines agent discovery with detailed observability and policy controls across several deployment models. Compare the Free and Premium limits with your expected use cases, projects, and retention needs.

Where Specifiction places it

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