- Verified by BizGlocal
A $0 Entry Plan, A Flat $50 Per Month Pro Tier With Unlimited Users, And A Free Self-Hosted Phoenix
- Headcount Not Published
- 2020
- HQ Not Stated On Its Site
About Arize AI
Industry leader in connected fleet operations
Market Position
AI observability and evaluation vendor whose customer pages name Wayfair, PagerDuty, Tripadvisor, Booking.com, Handshake, TheFork and LG Uplus, and whose Series C drew Datadog, PagerDuty and Microsoft’s M12 as investors.
Innovation Focus
Alyx, an in-app AI engineering agent that runs evals and debugs issues, plus OpenInference, an open GenAI semantic convention built on OpenTelemetry, and adb, a trace datastore that connects to BigQuery, Databricks and Snowflake.
Core Strengths
Tracing, online and offline evals, prompt playground, datasets and experiments across 40+ models, frameworks and tools, with SOC 2 Type II, ISO 27001, PCI DSS, GDPR and HIPAA listed on Arize’s site and data regions in the US, EU and Canada.
Use Cases
Debugging agent failures, running evals before release, monitoring cost, latency and quality in production, and giving small teams a free way to start before committing to a paid plan.
Core Products & Solutions
Arize AX
The managed AI engineering platform with tracing, evals, monitoring and continual improvement workflows. It comes in Free, Pro and Enterprise tiers and runs as SaaS, with self-hosting on Enterprise.
Arize Phoenix
An open-source, local-first tool for tracing, evaluation, experiments and prompt iteration, built on OpenTelemetry and OpenInference. Arize’s docs say Phoenix is free to self-host with no feature limits, and the repository carries the Elastic License 2.0.
Alyx
An in-app agent that runs evals, debugs issues and helps improve agents. The pricing page caps its issue analysis (“Signal”) at 10 issues a month on Free and 25 on Pro, with unlimited issues on Enterprise.
Evaluations And Experiments
Online and offline evals, datasets, experiments, human annotation, labeling queues and playgrounds, which the pricing page lists as unlimited on all three AX tiers.
OpenInference
An open-source GenAI semantic convention built on OpenTelemetry, which Arize uses to keep instrumentation portable across frameworks and providers.
adb And Data Fabric
A datastore for GenAI traces that syncs to BigQuery, Databricks and Snowflake. Arize’s docs state Data Fabric is available only to Enterprise accounts.
Pricing Overview
AX Free
Individual developers and small teams starting to trace and evaluate LLM apps
$0per month
- 25,000 trace spans per month
- 1 GB of ingestion per month
- 15 days of retention
- Unlimited users, with 1 space
- Community support
- 10 Alyx issues per month, no credit card required
AX Pro
Small teams moving an agent into production that want email support and longer history
$50per month
- 50,000 trace spans per month
- 10 GB of ingestion per month
- 30 days of retention
- Unlimited users, with 1 org and 2 spaces
- Email support and standard SLAs
- 25 Alyx issues per month
AX Enterprise
Larger organizations that need custom volume, self-hosting, SSO and dedicated support
Custom
Pricing
Custom
- Custom spans, ingestion and retention
- SaaS or self-hosted deployment
- Multiple orgs and spaces
- Dedicated support and custom SLAs
- Enterprise SSO, audit logs and service accounts
- Startup pricing mentioned on the page
Who Is Arize AI Best For?
Small Businesses
1-25 EmployeesTeams can start free and move to $50 a month with unlimited users, which suits a handful of engineers tracing one agent, but 50,000 spans a month fills quickly in a busy production app.
Mid-Market Companies
26-100 EmployeesTeams with several agents will likely outgrow Pro’s volume and retention and need a custom Enterprise quote, or can self-host Phoenix and run it themselves.
Enterprise Companies
100+ EmployeesLarge organizations get custom volume, self-hosting, SSO, audit logs and dedicated support, and Arize’s customer pages name Booking.com, Tripadvisor, PagerDuty and Wayfair.
Teams That Prefer Open Source
Any SizeEngineering teams that want to keep data on their own infrastructure can self-host Phoenix, including air-gapped, at no license cost, subject to the Elastic License 2.0 terms.
Measurable Impact & Benefits
1 Trillion
Spans Processed
Platform volume stated on Arize’s homepage, a vendor-reported figure without an audit.
1 Billion
Evals Per Year
Annual eval volume claimed on the homepage.
5 Million
Downloads Per Month
Download figure from the homepage, which does not specify the package or source.
70% To 96%
Agent Accuracy
Improvement Wayfair reports for an agent in its supplier transfer case study, listed on Arize’s customer page as +26%.
15+
LLM Use Cases In 6 Months
Production-ready use cases Handshake says it deployed and scaled with Arize AX in under six months.
Days To Minutes
For Evals
Time reduction Bazaarvoice describes in its case study title, with no figures on the customer page.
$70 Million
Series C
Funding round announced in February 2025, led by Adams Street Partners with Datadog and PagerDuty among investors.
About 11,000
GitHub Stars
Approximate star count for the Phoenix repository when checked in October 2026.
Arize AI Real reviews
Our Rating:
4.3
- Verified Users
- Verified Users
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Arize AI’s Pros & Cons
Balanced evaluation to help you make an informed decision
Strengths
- Published $0 Free and $50 per month Pro prices
- Unlimited users on all three AX tiers
- Unlimited evals, experiments, datasets, prompts and annotations on every tier
- Phoenix is free to self-host, including air-gapped, with no listed feature limits
- Built on OpenTelemetry and OpenInference, with 40+ integrations listed
- SOC 2 Type II, ISO 27001, PCI DSS, GDPR and HIPAA listed, with US, EU and Canada regions
- G2 rating of 4.3 and named enterprise customers
Limitations
- Pro covers only 50,000 spans, 10 GB and 30 days of retention
- No overage rates published for AX
- Phoenix uses the Elastic License 2.0, which bars offering it as a hosted service, so it is not an OSI open source license
- Custom dashboards, metrics and monitors are not listed on Free or Pro
- G2 reviewers cite a learning curve, noisy alerts and setup effort
- Headquarters, headcount and tier-level compliance mapping are not stated on its site
Our Verdict
Arize earns its Best in Pricing placement on a narrow but real comparison. It publishes $0 Free and $50 per month Pro with unlimited users, while LangSmith’s Plus plan is $39 per seat per month, so a five-person team pays $195 against Arize’s $50. W&B Pro starts at $60 per month for up to 10 model seats and is meant for organizations under 50 employees. Arize also offers a free self-hosted Phoenix, and LangSmith’s self-hosting is listed as an enterprise option. The case is qualified. Units differ: Arize meters spans, LangSmith traces and W&B Weave ingestion in GB, so the figures are not like for like, and LangSmith’s Plus includes 10,000 base traces with 14-day retention against Arize Pro’s 50,000 spans and 30 days. W&B publishes overage rates ($0.03 per GB of storage, $0.10 per MB of Weave ingestion on Pro) and Arize does not. Phoenix is source-available under ELv2. Price your own span volume on each vendor before choosing.
Resources
Resources & Documentation
Detailed materials for deeper evaluation
Pricing Page
Current Free, Pro and Enterprise limits for Arize AX.
Phoenix Documentation
Tracing, evaluation, prompts, datasets and experiments in the open-source project.
Phoenix Self-Hosting Guide
Docker, Kubernetes and Helm deployment, authentication and retention settings.
Phoenix GitHub Repository
Source code, license file and release history.
Series C Announcement
The $70 million round led by Adams Street Partners.
Wayfair Case Study
How an agent improved from 70% to 96% accuracy.
Handshake Case Study
How 15+ LLM use cases reached production in under six months.
Customer Stories
Nine case studies including Booking.com, Tripadvisor and PagerDuty.
What to Know
What to Know Before Buying
-
Instrumentation uses OpenTelemetry and OpenInference -
Enterprise self-hosting and SSO need a sales conversation
-
Arize lists 40+ models, frameworks and tools, and G2 reviewers cite OpenTelemetry and LangChain. Check that your framework, provider and language are covered before committing.
-
Pro caps at 50,000 spans and 10 GB a month, so growth means moving to a custom Enterprise quote. Enterprise adds multiple orgs, spaces and custom retention.
-
The pricing page lists no overage rates or add-ons. A self-hosted Phoenix has no license fee, but your team pays for hosting, storage and upkeep.
-
Because Arize builds on OpenTelemetry and OpenInference, traces are portable in principle. Arize does not document a migration path from LangSmith or W&B on the pages reviewed.
-
Free needs no credit card and Pro is a published monthly price. Enterprise terms, SLAs and startup pricing are custom, and the Elastic License 2.0 governs Phoenix use.
Alternatives
Compare Alternatives
See how Arize AI stacks up against competitors
Weights & Biases describes itself as an AI developer platform and says it is now part of CoreWeave Forge, with its pricing page redirecting there. Free is $0 with up to 5 model seats, and Pro starts at $60 a month for up to 10 model seats and is designed for organizations under 50 employees, while Arize Pro is $50 with unlimited users.
LangSmith describes itself as an observability platform for AI agents and LLM applications that works with any framework. Developer is $0 for 1 seat and 5,000 base traces, and Plus is $39 per seat per month with 10,000 base traces and 14-day retention, with overage rates not stated on the page, while Arize Pro is $50 flat.
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FAQ’s
Frequently Asked Questions
Common questions about Arize AI
Arize AX Free is $0 with 25,000 spans a month, AX Pro is $50 a month with 50,000 spans, and Enterprise is custom. Phoenix is free to self-host, and all AX tiers list unlimited users.
AX is Arize’s managed platform with Free, Pro and Enterprise tiers, while Phoenix is the open-source, local-first tool you run yourself. Arize built both on OpenTelemetry and OpenInference.
Arize calls it open source and its docs say it is free to self-host with no feature limits. The repository uses the Elastic License 2.0, which prohibits offering it to others as a hosted or managed service.
Yes, AX Free costs $0 with no credit card required and includes 25,000 spans, 1 GB of ingestion and 15 days of retention. Pro lists no free trial.
Arize’s site lists SOC 2 Type II, ISO 27001, PCI DSS, GDPR and HIPAA, with data regions in the US, EU and Canada. The pricing page does not make clear which tiers include each item, so request its trust documentation.
The pricing page lists no overage rates, so ask Arize in writing. Pro includes 50,000 spans and 10 GB a month, and Enterprise offers custom volume.
Arize Pro is $50 a month with unlimited users, W&B Pro starts at $60 for up to 10 model seats, and LangSmith Plus is $39 per seat. Units differ across the three, so compare on your own volume.
Common alternatives include Weights & Biases, LangSmith, Langfuse, Datadog and Braintrust, which differ in seat pricing, framework focus and self-hosting terms.