Arize Phoenix vs Langfuse
| Tagline | Open-source AI observability and evaluation | Open-source LLM engineering platform |
|---|---|---|
| Category | AI Agents | AI Agents |
| Pricing | Open Source | Open Source |
| Upvotes | 0 | 0 |
| Comments | 0 | 0 |
| Page views | 0 | 0 |
| Click-through to site | 0.0% | 0.0% |
| Readiness Score | 100/100 | 76/100 |
| 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 Langfuse?
Langfuse provides tracing, prompt management and evaluations for LLM applications and agents, self-hosted or in the cloud.
Not sold on either? See alternatives to Arize Phoenix or alternatives to Langfuse.
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 Langfuse if you want open-source LLM engineering platform.
Is Arize Phoenix better than Langfuse?
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 Langfuse?
Arize Phoenix is Open Source; Langfuse is Open Source. Check each website for current plans.