Arize AX
AI observability platform that traces, evaluates and monitors machine-learning and LLM applications in production, surfacing issues and root causes.
AX Free $0 (25k spans/month); AX Pro $50/month (Signal 25 issues/month, 50k spans, 10 GB, 30-day retention, SaaS); AX Enterprise custom (SaaS or self-hosted).
What it does
- Evaluation and observability
- Agent orchestration
How it compares
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Fiddler AI
Fiddler vs. Arize -- Arize Alternatives
Official documentation · 19 Sep 2026 -
Galileo
The fundamental question: Do you need a platform that tells you what went wrong yesterday, or one that prevents failures today?
Official documentation · 20 Sep 2026 -
Langfuse
For teams replacing Langfuse because agent complexity, unit costs, or enterprise requirements have grown past what the platform handles, Arize should be the first comparison.
Official documentation · 20 Sep 2026
Sources
- Pricing
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Title 'Arize AX Pricing': 'AX Pro For AI-native teams $50 per month … Deployment SaaS'; 'AX Enterprise … Custom … Deployment SaaS or Self-Hosted'; comparison table 'AX Free For builders $0'. Unchanged from 2026-08-31.
- What it does
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Official documentation · 5 Sep 2026
agent-orchestration added (batch 9 diff): the page's own feature list runs Signal, 'Managed Agents — Go from issue to fix with Managed Agents. Start from a guided template … or build from scratch', 'Swarm Observability — Monitor every agent in your swarm', Evaluation, Experiment.
- Sold within
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Arize's pricing page lists "AX Free" ("Start for free", "No credit card required"), "AX Pro" at "$50" "per month", and "AX Enterprise" at "Custom" ("Request demo").
- URL
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Official documentation · 5 Sep 2026
The record's url was the bare homepage. Fetched 2026-09-05, HTTP 200: the dedicated product page, title 'Arize AX - AI Engineering Platform for Self-Improving AI Agents', H1 'Continuous improvement for agents'.
- Deployment
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Free and Pro rows read 'Deployment SaaS'; Enterprise reads 'SaaS or Self-Hosted'. The product page's footer nav also lists 'Self-hosted Arize AX'.
Also from Arize AI
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Arize Phoenix Developer tool
Open-source platform for tracing, evaluating and experimenting with LLM and agent applications, run locally, via Docker/Kubernetes, or as free Phoenix Cloud instances.
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Arize Database (adb) Infrastructure service
An AI-native datastore (built on Apache Iceberg) that unifies observability and evaluation data in open formats for zero-copy access across the AI/data stack.
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Alyx AI agent
AI engineering agent built into Arize AX that reads a project's traces, prompts, datasets and evals and acts on them — investigating issues, improving prompts and running evaluations from a full-page or side-chat surface whose context carries across pages.
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