Comparison

Arize AI vs Langfuse: Open Source Agent Evals & Observability

Arize AI and Langfuse: Open Source Agent Evals & Observability both land on Depends.

Arize AI

Depends

Confidence: Medium

Buy if you ship production LLM agents at scale and need enterprise evals, tracing, and experimentation in one platform.

Depends

Confidence: Low

Buy if you ship LLM apps to production and need tracing, prompt management, and evals in one place; skip if you don't build AI features.

Arize AI versus Langfuse: Open Source Agent Evals & Observability
Compare	Arize AI	Langfuse: Open Source Agent Evals & Observability
Verdict	Depends	Depends
Best for	Teams running production LLM agents at scale	Teams shipping LLM apps to production
Who it's not for	Solo builders and tiny teams . free tracing tools suffice	Teams not building LLM-powered products
Privacy	No known public vulnerabilities found in the sources reviewed.^⁹	No known public vulnerabilities found in the sources reviewed.¹⁴
Support quality	No support-quality evidence found	No support-quality evidence found
Public sentiment	Reviewers praise the depth of its eval and tracing tooling, while some smaller teams and rivals argue it's more platform than they need.^⁴	No independent user reviews surfaced in reviewed sources; all claims are vendor-published adoption and feature statements.¹³
Biggest gotcha	Median contract is $60,000/year (Vendr); entry pricing won't reflect your real bill at scale.^³	Free tier caps at 50k observations/month; high-volume agents outgrow it fast, costs scale with volume¹³