Arize Phoenix vs LangSmith
| Tagline | Open-source AI observability and evaluation | Debug, test and monitor LLM apps and agents |
|---|---|---|
| Category | AI Agents | AI Agents |
| Pricing | Open Source | Freemium |
| Upvotes | 0 | 0 |
| Comments | 0 | 0 |
| Page views | 0 | 0 |
| Click-through to site | 0.0% | 0.0% |
| Readiness Score | 100/100 | 81/100 |
| Launched | Oct 5, 2026 | Oct 5, 2026 |
| Maker | — | — |
What is Arize Phoenix?
Phoenix by Arize is an open-source tool for tracing, evaluating and troubleshooting LLM applications and agents.
What is LangSmith?
LangSmith from LangChain helps teams trace, evaluate and monitor LLM applications and agents in development and production.
Not sold on either? See alternatives to Arize Phoenix or alternatives to LangSmith.
Verdict
Arize Phoenix leads on 1 of the measurable metrics above (votes, engagement, click-through and readiness). Choose Arize Phoenix if you want open-source AI observability and evaluation; choose LangSmith if you want debug, test and monitor LLM apps and agents.
Is Arize Phoenix better than LangSmith?
On AskableHQ's community and engagement data, Arize Phoenix currently performs better, but the right choice depends on your use case.
Which is cheaper, Arize Phoenix or LangSmith?
Arize Phoenix is Open Source; LangSmith is Freemium. Check each website for current plans.