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Langfuse Alternatives

5 alternatives to Langfuse — free and paid AI coding tools covering similar jobs, with pricing and standout strengths.

Full comparison: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

Looking for a Langfuse alternative? Langfuse is listed under Observability (open source). The 5 tools below cover similar jobs, closest matches first — the table compares pricing, license, and platforms so you can shortlist quickly, and each entry further down adds a fuller summary and a link to the full profile.

ToolPricingLicensePlatformsCategory
Arize PhoenixfreeElastic-2.0—Observability
LangSmithfreemium——Observability
Braintrustfreemium——Evaluation
AgentOpsfreemium——Observability
Heliconeopen sourceApache-2.0—Observability

Free and open-source alternatives to Langfuse

Langfuse alternatives in detail

  1. Arize Phoenix

    freeElastic-2.0Observability

    Arize Phoenix is a source-available (ELv2) LLM tracing and evaluation tool built on OpenTelemetry/OpenInference. Run it locally in a notebook or self-host it to capture traces, run evals (including LLM-as-judge), and debug RAG and agent runs without sending data to a vendor.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

    Read: Best LLM & RAG Evaluation Tools in 2026: DeepEval vs RAGAS vs LangSmith vs Phoenix vs promptfoo

  2. LangSmith

    freemiumObservability

    LangSmith is LangChain's hosted platform for tracing, evaluating, and monitoring LLM applications. It captures every step of a chain or agent run, lets you build datasets and run offline/online evals, and works whether or not you use LangChain.

    Read: Langfuse vs LangSmith: LLM Observability Compared (2026)

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

    Read: Best LLM & RAG Evaluation Tools in 2026: DeepEval vs RAGAS vs LangSmith vs Phoenix vs promptfoo

  3. Braintrust

    freemiumEvaluation

    Braintrust is a hosted platform that ties together LLM evaluation, a prompt playground, datasets, and production logging in one loop — write evals, iterate on prompts side by side, and watch real traffic, so the dev-and-monitor cycle lives in one place.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

    Read: Best LLM & RAG Evaluation Tools in 2026: DeepEval vs RAGAS vs LangSmith vs Phoenix vs promptfoo

  4. AgentOps

    freemiumObservability

    AgentOps is observability built for agents specifically: session replay of every step, tool call, and LLM call, plus cost, latency, and failure tracking. A few lines of SDK turn an opaque multi-step agent run into a timeline you can debug and a dashboard you can monitor.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

  5. Helicone

    open sourceApache-2.0Observability

    Helicone is an open-source LLM observability platform and AI gateway with a one-line integration — logging, tracing, caching, and cost/latency tracking across providers. Note: Mintlify acquired Helicone in March 2026 and it's now in maintenance mode (security, bug, and new-model updates continue), though the Apache-2.0 proxy still works and is self-hostable.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix