Arize Phoenix vs LangSmith
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Arize Phoenix
Free, self-hosted LLM tracing and evaluation
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LangSmith
LangChain's platform for tracing, evaluating and deploying agents
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| RECATOOLS Score | 7.8 / 10 | 7.9 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Free | Freemium |
| Free tier | Self-host Phoenix free: no licence fees, usage limits or feature gates. Arize AX Free cloud tier: 25k spans, 1 GB ingest a month, 15-day retention | Developer: $0 for 1 seat with 5k base traces a month, then pay as you go |
| Paid from | Phoenix is free. Arize's managed AX Pro plan is $50/month | $39/seat/month (Plus, 10k base traces a month included), then usage |
| Has API | ✓ | ✓ |
| Open source | ✓ | ✗ |
| Free to use | ✓ | ✓ |
| Users | — | — |
| Founded | 2023 | 2023 |
| Maker | Arize AI | LangChain Inc. |
| Verdict | Arize Phoenix is one of the most complete no-cost options for finding out why an agent or RAG pipeline behaved as it did: OpenTelemetry tracing, evals, datasets, experiments and a prompt playground, self-hosted with no f... |
LangSmith is the most complete option for teams already on LangChain or LangGraph, where tracing works almost out of the box, and it is no longer tied to that stack: SDKs and OpenTelemetry bring in any framework. Evals,... |
| Full review → | Full review → |
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.