Alternatives

Langfuse alternatives in 2026 (Helicone, Braintrust, LangSmith, Arize Phoenix, Traceloop / OpenLLMetry)

Top Langfuse alternatives in 2026: Helicone (proxy-based simplicity), Braintrust (eval-first), LangSmith (LangChain-native), Arize Phoenix (open source), OpenLLMetry / Traceloop (OpenTelemetry-native).

Why people search this

People look for Langfuse alternatives because they want proxy-based zero-touch setup (Helicone), eval-first workflows (Braintrust), LangChain-native tracing (LangSmith), open-source self-host (Phoenix), or OpenTelemetry standards (OpenLLMetry).

The ranking

#1

Helicone

Best for: Fastest monitoring setup, cost visibility  ·  Price: Free tier + usage-based

One-line setup (change base URL) for cost, latency, and request observability — fastest path to LLM monitoring.

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#2

Braintrust

Best for: Eval-first workflows, regression test pipelines  ·  Price: Free tier + paid

Eval-first observability platform with datasets, experiments, and golden sets — Anthropic's stated production tool.

#3

LangSmith

Best for: LangChain / LangGraph stacks  ·  Price: Free + paid tiers

Native observability for LangChain / LangGraph apps — traces, evals, prompt management.

#4

Arize Phoenix

Best for: Open-source, notebook-driven LLM eval  ·  Price: Free OSS + Arize cloud

Open-source LLM observability + evals from Arize AI — local notebook UI + cloud SaaS.

#5

OpenLLMetry (Traceloop)

Best for: OpenTelemetry stacks, BYO observability backend  ·  Price: Free SDK + Traceloop cloud

OpenTelemetry-native LLM observability — works with any backend (Datadog, Grafana, Honeycomb, etc.).

FAQ

Fastest setup?

Helicone — change OpenAI base URL to proxy, done.

Open-source Langfuse alternative?

Arize Phoenix or OpenLLMetry — both fully open source.

Best for evals?

Braintrust — eval-first workflow used by Anthropic in production.

Related

Last updated: 2026-06-01.