Arthur

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Score6.9

Rank#8 of 24

From$60/mo

Free planYes

Runs onAPI, Self-hosted, Web

Summary

Arthur is a platform for finding AI agents across enterprise environments and providing a shared way to observe and govern them. Its discovery sensors watch OpenTelemetry streams, MCP servers, network traffic, cloud APIs, and employee endpoints. Arthur records agent steps, tool calls, retrieved context, costs, latency, and behavior over time. Governance tools apply machine-checkable policies and return real-time guardrail verdicts for issues such as prompt injection, PII exposure, restricted models, and off-policy tool use. Deployment options include hosted SaaS, on-premises, and hybrid setups. 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 across deployment options. 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. Platforms listed are API, self-hosted, and web.

Who it is for

Arthur suits organizations that need to discover and monitor agents across multiple enterprise systems, with governance controls for agent behavior. Its Free plan may fit teams monitoring up to 4 use cases.

What is good

Monitors OpenTelemetry, MCP, network, cloud, and endpoint signals.
Traces steps, tool calls, costs, and latency.
Real-time guardrails cover prompt injection and PII exposure.
Hybrid evaluation keeps sensitive data in the environment.
Free plan includes unlimited seats.

What to know first

Free plan retains data for 7 days.
Free plan is limited to 2 projects.
Premium costs 60.00 USD per month.

Verdict

Arthur combines agent discovery, observability, and policy controls in one platform, with hosted, on-premises, and hybrid deployment options. Check the Free plan's project and retention limits against your monitoring needs before choosing a paid plan.

Arthur plans and pricing

All plans

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 arthur.ai · 30 Sept 2026

Premium $60/mo $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 arthur.ai · 30 Sept 2026

Enterprise Not published Custom Unlimited organizations, workspaces, projects, and data retention · Custom jobs, spans, inferences, and evals · Dedicated and managed VPC options · SSO, SLAs, and BAA arthur.ai · 30 Sept 2026

Compared on model monitoring software

Free plan: Yesarthur.ai
Paid from: $60/moarthur.ai
Drift monitoring: Yesarthur.ai
Model performance metrics: Yesarthur.ai
Bias monitoring: Yesarthur.ai
Alert channels: webhook, Slackarthur.ai

Facts

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