LangSmith vs Arize Phoenix — Pricing (2026)
Compare / LangSmith vs Arize Phoenix
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Team size
25 seats

LangSmith vs Arize Phoenix

AI Observability & Evals pricing comparison · 2026

LangSmith pricing ranges from $0–$500/seat/month + per trace, while Arize Phoenix ranges from $0–$1000/month. LangSmith is typically 22% more affordable, though your actual cost depends on tier and team size.

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See pricing on each vendor's site
Above-the-fold path — each link opens the vendor's pricing page in a new tab.
Visit LangSmith pricing
Free plan limits → Discount programs →
Visit Arize pricing
Free plan limits → Discount programs →
Compare
2 products · AI Observability & Evals
Side-by-side · live
LangSmith
LangSmith pricing starts at $0/month on the Developer plan, offering LLM tracing, prompt v
verified 9w ago
View pricing →
Arize Phoenix
Arize Phoenix pricing starts at $0 with two free options: the self-hosted open-source Phoe
verified 10w ago
View pricing →
Estimated license cost
at 25 seats
List price × seats. Click a tier below to lock it.
Usage-based
$2.5 per 1k traces
see vendor pricing for volume tiers
Usage-based
$10 per 1M spans
see vendor pricing for volume tiers
REF · 01

Sources & confidence

Every dollar amount and contract clause below traces back to a sourced fact. We don't manufacture composite scores.

Where this data comes from
Vendr · TrustRadius · Reddit · BBB · official docs
Sources 2 sourced facts
2 hidden-cost
Last verified 2mo ago
Confidence Medium confidence
Sources 7 sourced facts
7 hidden-cost
Last verified 2mo ago
Confidence Medium confidence
REF · 02

Plans at a glance

Every tier per product. Lock one to drive the cost row above and reveal a tier-specific outbound CTA.

Tier ladder
Click a tier to lock the cost row to it. Locking surfaces a tier-specific Visit CTA.
REF · 03

Hidden costs

Each cost is severity-ranked, with the dollar range quoted from its source (Vendr, Reddit, TrustRadius, BBB, official docs) — never our estimate.

Beyond the sticker
Severity-ranked, sourced
2 documented
  • LangGraph Platform Separate Pricing
    10-25% of license costs
    1 source
  • Hosted Platform Features Not Disclosed Pre-Login
    $39/month
    1 source
5 documented
  • AX Pro Overage Charges
    $0.0008 per span, $3 per additional GB
    1 source
  • AX Enterprise Plan Cost
    $60,000/year
    1 source
  • Limited Features in Free Plans
    1 source
  • Self-Hosting Operational Costs
    1 source
  • Paid Support for Self-Hosted Phoenix
    1 source
REF · 05

What users say

Aggregated, with sample sizes. We use whichever review platform has data.

User reviews
TrustRadius · Trustpilot · G2
No public ratings yet
Best for
Individual developers getting started
Watch out
Premium pricing relative to open-source self-hosted alternatives like Langfuse
No public ratings yet
Best for
Teams wanting self-hosted observability
Watch out
Lack of Prompt Management and Usage Analytics
Decide
Get a quote from each vendor
Each link opens the vendor's pricing page in a new tab.
Visit LangSmith pricing
Free plan limits → Discount programs →
Visit Arize pricing
Free plan limits → Discount programs →
License cost is computed from publicly listed plans (real math, list price × seats). Median annual cost is from Vendr's deal flow when available — see source badges. Hidden costs and contract terms each cite their own sources. We do not invent composite scores.
AI Observability & Evals

LangSmith

$0–$500
/seat/month + per trace
3 plans · Free tier
Full pricing breakdown →
VS
AI Observability & Evals

Arize Phoenix

$0–$1000
/month
4 plans · Free tier
Full pricing breakdown →

LangSmith and Arize Phoenix both operate in the ai observability category. This page compares their published pricing.

Plan-by-Plan Pricing

Plan LangSmith Arize Phoenix
Developer Free /seat/month Free /month
Plus $39 /seat/month Free /month
Enterprise Custom $50 /month
AX Enterprise — Custom

Cost at Scale

Total cost of ownership — licenses, implementation, and hidden costs included.

LangSmith

4 scenarios
$0/month (Developer plan)
Solo Developer
$39/month (Plus plan)
Small Dev Team
$117
Small Team (3–5 Developers)
$195/month (3–5 users × $39/user/month on Plus plan)
See all 4 scenarios →

Arize Phoenix

6 scenarios
$0/month
Solo Developer — Self-Hosted Open Source
$50/month
Small Team — AX Pro Hosted
Custom — contact Arize
Enterprise Team — AX Enterprise
See all 6 scenarios →

Hidden Costs

Beyond the sticker price — what catches buyers off guard.

LangSmith 2 hidden costs

medium
LangGraph Platform Separate Pricing 10-25% of license costs
low
Hosted Platform Features Not Disclosed Pre-Login $39/month
See all LangSmith hidden costs →

Arize Phoenix 7 hidden costs

high
AX Pro Overage Charges $0.0008 per span, $3 per additional GB
high
AX Enterprise Plan Cost $60,000/year
medium
Limited Features in Free Plans
medium
Self-Hosting Operational Costs
medium
Paid Support for Self-Hosted Phoenix
See all Arize Phoenix hidden costs →

Continue researching

LangSmith

Arize Phoenix

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