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The AI & Agent Engineering Platform for LLM observability, evaluation, and development.

From $50/mo (free plan available)Visit Website
Reviews on G2
48 reviews tracked 1 press mention

The Bottom Line

Price
From $50/mo (free plan available). Compare plans

Key facts

  • Unified platform for LLM observability, evaluation, and development.
  • Provides tools for prompt optimization, LLM-as-a-Judge, and real-time monitoring.
  • Built on open standards, offering transparency and interoperability.

Pros

  • Provides a comprehensive, unified platform for the entire AI lifecycle from development to production.
  • Offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI.
  • Built on open standards and open-source components, promoting transparency and flexibility.
  • Includes an AI assistant (Alyx) to aid in debugging and accelerate development.
  • Scalable for enterprise use with features like custom data limits, SOC2, and HIPAA compliance.

Cons

  • The complexity of features might have a learning curve for new users.
  • Pricing for higher tiers is custom, which may require direct engagement with sales.
  • Specific limitations on trace spans and ingestion volume for free and lower-paid tiers.

What is Arize AI?

Arize AI is a comprehensive platform designed for building, evaluating, and improving AI agents and applications, particularly focusing on Large Language Models (LLMs). It provides a unified environment for AI development, observability, and evaluation, enabling teams to iterate faster and ship reliable AI. The platform helps close the loop between AI development and production by using real production data to power better development and aligning production observability with trusted evaluations. Arize AI caters to AI product managers, engineers, and data scientists by offering tools for prompt optimization, LLM-as-a-Judge evaluations, human annotation, and real-time monitoring. It helps detect prompt and agent regressions early, pinpoint model failures, analyze critical data patterns, and address model drift. The platform is built on open standards like OpenTelemetry and offers an open-source evaluation library, ensuring transparency and interoperability with existing tech stacks. It also includes Alyx, an AI teammate for LLM application development, to assist with debugging and knowledge sharing.

Available on: Web

Ratings Across the Web

4.3 (48 reviews)

Arize AI holds an aggregate rating of 4.3 out of 5 from 48 reviews across G2, last checked September 29, 2026.

Ratings aggregated from independent review platforms. Learn more

Preview

Key Features

  • LLM Observability & Evaluation Platform
  • Agent Tracing
  • LLM-as-a-Judge Evaluation
  • Prompt Optimization & Management
  • Real-time Monitoring and Dashboards
  • Human Annotation and Labeling Queues
  • Model Drift Detection
  • AI-driven Cluster Search for Anomaly Detection

Pricing Plans

Pricing checked Oct 11, 2026

Arize AI plans and prices, checked October 2026
PlanPriceDetails
Phoenix

Free & open source

  • Trace spans: User managed
  • Ingestion volume: User managed
  • Projects: User managed
+2 more
  • Retention: User managed
  • Support add-on: Dedicated support
AX Free

Free

  • Trace spans: 25k spans per month
  • Ingestion volume: 1 GB per month
  • Projects: N/A
+5 more
  • Retention: 7 days
  • Alyx (Arize agent)
  • Online evals
  • Product observability (monitors & custom metrics)
  • Community support
AX Pro

$50 / month

  • Trace spans: 50k spans per month
  • Ingestion volume: 10 GB per month
  • Projects: N/A
+5 more
  • Retention: 15 days
  • Everything in AX Free
  • Higher rate limits
  • Longer retention
  • Email support
AX Enterprise

Custom

  • Trace spans: Custom
  • Ingestion volume: Custom
  • Projects: Custom
+11 more
  • Retention: Configurable
  • Everything in AX Pro
  • Dedicated support
  • Uptime SLA
  • Custom data limits
  • SOC2 reports and HIPAA
  • Training sessions
  • DataFabric Connect
  • Self-Hosting add-on
  • Data residency
  • Multi-region deployments

Is Arize AI worth the price?

Good value

Arize AI offers a generous free tier (AX Free) and an open-source option (Phoenix), making it highly accessible for individual developers and small teams.

The AX Pro tier at $50/month provides a good step up in resources for growing projects. Enterprise users will find custom solutions, which is standard for this level of service.

Hidden Costs & Gotchas

Self-hosting is an Enterprise add-on

Full Arize AI pricing: every plan, hidden costs and alternatives

Reviews

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4.3/5

Across 48 verified user reviews on G2

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Arize AI FAQ

How does Arize AI assist in the development of AI agents?

Arize AI provides a unified environment for building, evaluating, and improving AI agents and applications, specifically focusing on Large Language Models. It offers tools for prompt optimization, LLM-as-a-Judge evaluations, and real-time monitoring to help iterate faster and ship reliable AI.

Which teams benefit most from using Arize AI?

Arize AI is designed for AI product managers, engineers, and data scientists. It provides them with tools for prompt optimization, evaluation, and monitoring to accelerate AI development and ensure reliability in production.

How does Arize AI compare to WhyLabs?

Arize AI offers a comprehensive, unified platform for the entire AI lifecycle from development to production, including advanced evaluation capabilities like LLM-as-a-Judge and human annotation. It also includes an AI assistant, Alyx, to aid in debugging and accelerate development.

What kind of limitations might a new user encounter with Arize AI?

New users might experience a learning curve due to the complexity and breadth of features offered by Arize AI. Additionally, there are specific limitations on trace spans and ingestion volume for the free and lower-paid tiers.

How is Arize AI priced?

Arize AI is available on a free tier, with paid plans offering more usage and advanced features. Pricing for higher tiers is custom and requires direct engagement with sales.

Can Arize AI integrate with existing technology stacks?

Yes, Arize AI is built on open standards like OpenTelemetry and offers an open-source evaluation library. This design ensures transparency and interoperability with existing tech stacks, allowing for flexible integration.

How does Arize AI help in identifying and addressing model issues?

Arize AI helps detect prompt and agent regressions early, pinpoint model failures, and analyze critical data patterns. It also assists in addressing model drift by using real production data to power better development and aligning production observability with trusted evaluations.

Source: arize.com

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