LangSmith vs Arize Phoenix
Ai Observability 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.
LangSmith
LangSmith pricing starts at $0/month on the Developer plan, offering LLM tracing, prompt v
verified today
View pricing →
Arize Phoenix
Arize Phoenix pricing starts at $0 with two free options: the self-hosted open-source Phoe
verified 7d 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
today
Confidence
Medium confidence
Sources
No structured sources
Last verified
1w 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 · 05
What users say
Aggregated, with sample sizes. We use whichever review platform has data.
User reviews
TrustRadius · Trustpilot · G2
Decide
Get a quote from each vendor
Each link opens the vendor's pricing page in a new tab.
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.
VS
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)
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