Arthur
AI observability platform monitoring model performance, bias, drift and behavior for ML and generative AI/agentic applications in production, built on an open-source evals engine.
Free $0/month (small teams getting started); Premium $60/month (AI-native startups and growing orgs); Enterprise custom (advanced needs, global scale). Also offers an open-source "Arthur Evals Engine" and a Startup Partner Program.
What it does
- Evaluation and observability
Sources
- Pricing
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Three named tiers read live: Free $0/mo; Premium $60/mo; Enterprise custom.
- Description
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Official documentation · 9 Sep 2026
Own homepage and pricing page name model monitoring, bias/drift detection and the open-source Arthur Evals Engine.
- Sold within
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Bought and metered on its own pricing page -- no parent offering it ships inside.
- URL
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Official documentation · 9 Sep 2026
Fetched 2026-09-09: markets as an independent AI observability product.
- Deployment
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No self-hosted, VPC or on-premise option named at any tier, including Enterprise -- SaaS only, per the live pricing page.
Also from Arthur AI
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Arthur Engine Developer tool
Open-source, real-time evaluation engine for generative AI and traditional ML models: instant analysis of outputs, active guardrails, and built-in plus customizable metrics, run inside a user's own infrastructure independently of the hosted Arthur platform.
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Arthur Agent Security & Governance Application
Module within the Arthur AI Platform providing security scanning, policy enforcement and governance controls specifically for autonomous agent deployments (tool-use permissions, action auditing, risk scoring).
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