Arthur helps enterprises find AI agents across their environments and provides a shared framework to observe and govern them. Discovery sensors monitor OpenTelemetry streams, MCP servers, network traffic, cloud APIs, and employee endpoints. Arthur traces agent steps, tool calls, retrieved context, costs, latency, and behavior over time. Governance features apply machine-checkable policies and return real-time guardrail verdicts for prompt injection, PII exposure, restricted models, and off-policy tool use. Deployment choices include hosted SaaS, on-premises, and hybrid options; in hybrid deployments, the evaluation engine runs alongside 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 0.00 USD per month and includes up to 4 use cases, 2 projects, and 7-day data retention. Premium is 60.00 USD per month. Enterprise pricing is custom.
Who it is for
Arthur suits organizations that need to discover, monitor, or govern AI agents across enterprise systems. Its hosted, on-premises, and hybrid deployments offer options for different deployment environments.
What is good
- Monitors agent activity across several discovery sources.
- Traces tool calls, context, costs, and latency.
- Provides real-time policy verdicts for listed risks.
- Hosted, on-premises, and hybrid deployments are available.
- Free plan includes up to 4 use cases.
What to know first
- Free plan retains data for 7 days.
- Free plan is limited to 2 projects.
- Premium is 60.00 USD per month.
- Enterprise pricing is custom.
Verdict
Arthur combines agent discovery, observability, and policy controls with hosted, on-premises, and hybrid deployment choices. The Free plan has defined use-case, project, and retention limits; Enterprise pricing requires a custom quote.
Get started with Arthur
- Visit https://www.arthur.ai/.
- Choose a hosted SaaS, on-premises, or hybrid deployment.
- Select the Free plan or Premium at 60.00 USD per month; Enterprise pricing is custom.
- Connect documented integrations or data connectors relevant to your environment.
- Set up agent monitoring and governance with Arthur's discovery and policy capabilities.
What the free plan stops at
The Free plan is limited to 4 use cases, 1 organization, 1 workspace, 2 projects, and 7-day data retention. It also includes 5k jobs, 300k spans, 12k inferences, and 3k evals. Premium raises the limits to 100 use cases, 10 projects, 30-day retention, 20k jobs, 1.2M spans, 100k inferences, and 75k evals.
Questions about Arthur
Is Arthur free?
Yes. The Free plan costs 0.00 USD per month and includes up to 4 use cases, 2 projects, and 7-day data retention.
How much does Premium cost?
Premium costs 60.00 USD per month. It includes up to 100 use cases, 10 projects, and 30-day data retention.
What deployment options does Arthur offer?
Arthur offers hosted SaaS, on-premises, and hybrid deployment options.
Which platforms are listed?
Arthur lists API, self-hosted, and web platforms.
Does Arthur have an open-source component?
Yes. Its Evals Engine is open source and includes built-in PII, sensitive-data, custom-LLM, and regex rules.
Which integrations are documented?
They include OpenAI, Anthropic, LangChain, LiteLLM, CrewAI, LlamaIndex, OpenAI Agents, Google ADK, AWS Bedrock, and Mastra.
Arthur plans and pricing
All plansCompared on model monitoring software
- Free plan
- Yes
- Paid from
- $60/mo
- Drift monitoring
- Yes
- Model performance metrics
- Yes
- Bias monitoring
- Yes
- Alert channels
- webhook, Slack
