Price checkMonthly
Phoenix (Open Source)FreeAX FreeFreeAX Pro$50/mo
See all 4 plans

All Arize Phoenix Plans & Pricing

Plan Monthly Annual Best For
View all features by plan (compare side-by-side)

Phoenix (Open Source)

  • Fully self-hosted
  • User-managed retention
  • All core tracing and eval features
  • Optional paid support add-on

AX Free

  • 25k spans/month
  • 1 GB ingestion/month
  • 15-day retention
  • Alyx agent
  • Online evals
  • Community support

AX Pro

  • 50k spans/month included
  • 10 GB ingestion/month
  • 30-day retention
  • Email support
  • Startup pricing available

AX Enterprise

  • Custom span/ingestion limits
  • Configurable retention
  • Dedicated support
  • Uptime SLA
  • SOC2/HIPAA
  • SaaS or self-hosted
  • Multi-region data residency
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What does Arize Phoenix actually cost you?

Drag the slider. Pick a tier. Your projected spend updates as you go.

Tier
Billing
Your projected cost$1.3Kper month · $50/unit × 25units
Year 1 license$15K12 months at this rate
At a glance

List price by tier (annualized, per unit)

Per-unit list price across Arize Phoenix's plans, annualized. Custom-priced tiers show a hatched bar.

Phoenix (Open Source)Custom
AX FreeCustom
AX Pro$600/yr
AX EnterpriseCustom
Quick Answer
Last verified:
Medium confidence

Arize Phoenix costs Free to $1K per month as of July 2026, with 4 plans available including a free tier. Plans: Phoenix (Open Source) (free), AX Free (free), and AX Pro at $50/month. Enterprise pricing is available on request. Pricing depends on your chosen tier, contract length, and negotiated discounts.

Use the interactive pricing calculator to estimate your exact cost based on team size and requirements.

  • Free tier: Yes

Arize Phoenix offers 4 pricing tiers: Phoenix (Open Source), AX Free, AX Pro, AX Enterprise. A free plan is available. Paid plans include AX Pro at $50/month. The AX Free plan is individual developers evaluating ax cloud.

Compared to other ai observability & evals software, Arize Phoenix is positioned at the mid-market price point.

  • 7 documented hidden costs beyond list price
Last verified:

How much does Arize Phoenix cost?

Arize Phoenix offers 4 pricing plans, starting with a free tier and scaling to custom enterprise pricing. Plans include Phoenix (Open Source) (free), AX Free (free), AX Pro at $50/month, AX Enterprise (custom pricing).

Arize Phoenix Pricing Overview

Arize Phoenix has 4 pricing plans, including a free tier. Paid plans range from $0 to $1,000/month. The Phoenix (Open Source) plan is free and is best for teams wanting self-hosted observability. The AX Free plan is free and is best for individual developers evaluating ax cloud. The AX Pro plan costs $50/month, best for small teams running production llm apps. The AX Enterprise plan requires contacting sales for a custom quote and is designed for enterprises with compliance and scale needs.

There are at least 7 documented hidden costs beyond Arize Phoenix's list price, including implementation, training, and add-on fees.

This pricing was last verified in May 14, 2026.

Try Arize Phoenix Free

Arize Phoenix pricing starts at $0 with two free options: the self-hosted open-source Phoenix (Open Source) plan and the cloud-hosted AX Free tier. For teams that prefer managed infrastructure, the AX Pro plan runs $50/month. Larger organizations with advanced security, SLA, or scale requirements can contact Arize for custom AX Enterprise pricing.

How Arize Phoenix Pricing Compares

Compare Arize Phoenix pricing against top alternatives in AI Observability & Evals.

Braintrust $0-$1000/month Compare → LangSmith $0-$500/seat/month + per trace Compare → Langfuse $0-$2499/month Compare →

Usage-Based Rates

Per-unit pricing for Arize Phoenix API usage.

AX Pro

Item Dimension Unit Rate
span request 1M spans $10.00
ingestion storage GB $3.00

Compare Arize Phoenix vs Alternatives

Before committing to Arize Phoenix, compare pricing with these 3 alternatives in the same category.

VSBraintrust
Free

Solo developers and small evaluations

Full comparison
VSLangSmith
Free

Individual developers getting started

Full comparison
VSLangfuse
Free

Side projects and evaluation

Full comparison

All Arize Phoenix alternatives & migration guides

What Companies Actually Pay for Arize Phoenix

Review scores
Third-party review aggregates, as of Jul 2026
Top pricing complaints
Lack of Prompt Management and Usage AnalyticsNot Fully Production-Ready for All Use CasesCustom Pipelines for Evaluation-to-Production IntegrationInfrastructure Overhead for Self-Hosting

Arize Phoenix Year 1 Total Cost by Company Size

Real deployment costs including licenses, implementation, training, and admin — not just the sticker price.

Solo Developer — Self-Hosted Open Source $0 Year 1 total

Individual developer running Phoenix locally for LLM tracing and evaluation, no cloud costs.

Small Team — AX Pro Hosted $50 Year 1 total

Team using the Arize-hosted AX Pro plan for LLM observability without managing infrastructure.

Enterprise Team — AX Enterprise Custom — contact Arize Year 1 total

Larger organization requiring custom capacity, SLAs, or enterprise security features.

Individual Developer (Self-Hosted) $0 Year 1 total

Solo developer running Arize Phoenix open source locally or on personal infrastructure for LLM tracing and evaluation with no hosting costs.

Small Team (Hosted Free Tier) $0 Year 1 total

Small team using the hosted AX Free tier for LLM observability without managing infrastructure.

Growing Engineering Team (AX Pro) $600 Year 1 total
$50/month
Total $600

Team requiring managed hosted infrastructure with expanded capabilities beyond the AX Free tier limits.

Current tier data

How Arize Phoenix Pricing Compares

Software Starting Price Top Price
Arize Phoenix Free $1000/month
Braintrust Free $1000/month
Helicone Free $2000/month
Humanloop Custom Custom
Langfuse Free $2499/month
LangSmith Free $500/seat/month + per trace

Detailed pricing comparisons:

Browse all AI Observability & Evals pricing →

7 Arize Phoenix Hidden Costs Beyond the List Price

Beyond the listed price, Arize Phoenix has at least 7 documented hidden costs that can significantly increase total cost of ownership.

Watch for 7 hidden costs
  • AX Pro Overage Charges $0.0008 per span, $3 per additional GB
    high 1 source
    industry "Overage Charges: For the AX Pro plan, which starts at $50/month, additional spans beyond the included 50,000 per month are charged at $0.0008 per span (or $10 per million spans)"
  • AX Enterprise Plan Cost $60,000/year
    high 1 source
    industry "Enterprise Plan: The AX Enterprise plan has custom pricing, with a median reported cost of $60,000/year, making it suitable for organizations with HIPAA, SOC2, and petabyte-scale performance requirements"
  • Limited Features in Free Plans
    medium 1 source
    industry "Feature Limitations in Free/Open Source: The free Phoenix (self-hosted) and AX Free plans do not include features like Alyx (Arize's AI assistant), online evaluations, or production monitors, which are only available on Arize's cloud"
  • Self-Hosting Operational Costs
    medium 1 source
    industry "Self-Hosting Costs: While Phoenix is open-source and self-hosted, it requires DevOps bandwidth to run servers, and support is only available as a paid add-on"
  • Paid Support for Self-Hosted Phoenix
    medium 1 source
    industry "Self-Hosting Costs: While Phoenix is open-source and self-hosted, it requires DevOps bandwidth to run servers, and support is only available as a paid add-on"
  • Potential Hidden Add-ons
    medium 1 source
    industry "General Hidden Costs in SaaS: Buyers report that proprietary software suites can have hidden add-ons, per-seat gates that slow collaboration, and overage fees that punish success, making bills unpredictable"
  • Potential Per-Seat Gates
    low 1 source
    industry "General Hidden Costs in SaaS: Buyers report that proprietary software suites can have hidden add-ons, per-seat gates that slow collaboration, and overage fees that punish success, making bills unpredictable"
Tip

Ask your Arize Phoenix sales rep about these costs upfront. Getting them in writing before signing can save you from surprise charges later.

Full hidden costs breakdown →

Intelligence sourced from 1 independent sources
industry
Key claims include inline source attribution. Data verified against multiple independent sources. 7 source citations total.

Arize Phoenix Pricing FAQ

01 Does Arize Phoenix have a free plan?

Yes. Arize Phoenix offers two free entry points: the Phoenix (Open Source) plan at $0 for self-hosting, and the AX Free hosted tier also at $0. A Reddit discussion in the LLM tooling community confirms that Arize offers a free tier alongside its paid options.

02 What does Arize Phoenix cost for a team?

For teams using the hosted platform, the AX Pro plan costs $50/month. Enterprise teams with larger-scale requirements receive custom pricing under the AX Enterprise plan.

03 How does Arize Phoenix compare to LangSmith or LangFuse on price?

One Reddit commenter noted that LangSmith and LangFuse both offer free tiers with paid tiers running $40–$100/month, while Arize's pricing beyond its free tier 'isn't fixed' — suggesting enterprise pricing is custom-quoted rather than published. Arize Phoenix's AX Pro plan is $50/month for hosted access.

04 Is Arize Phoenix a good fit for LlamaIndex projects?

Yes. A Reddit commenter described Arize Phoenix as an alternative to LangSmith specifically for teams already in the LlamaIndex ecosystem, noting its workflows are similar to LangGraph.

Is this pricing incorrect? — we'll verify and update it.