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  1. Home
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  3. Alternatives to Langfuse
Langfuse

Best Alternatives to Langfuse

Observability · 8 alternatives ranked of 36 in the category

Looking for alternatives to Langfuse? These are the observability tools that score highest on adoption, reviews, benchmarks, and public code, with what separates each one from Langfuse.

Helicone logo
Helicone

Observability· helicone.ai

Freemium

Open-source AI gateway and LLM observability platform for logging, tracing, routing, evaluation, caching, and cost monitoring across model providers and agent stacks.

How each alternative differs from Langfuse

Ranked by adoption, review, benchmark, and repository signals. Each note below is drawn from the two products’ own catalog records, so a product with nothing to separate it from Langfuse carries no note.

  1. 2

    DeepEval

    DeepEval is open source against Langfuse's freemium model.

  2. 3

    MLflow

    MLflow is open source against Langfuse's freemium model.

  3. 4

    OpenPipe ART

    OpenPipe ART is open source against Langfuse's freemium model.

  4. 5

    Opik

    Opik is open source against Langfuse's freemium model.

  5. 6

    Phoenix

    Phoenix is open source against Langfuse's freemium model.

  6. 8

    Promptfoo

6,165
Open source
DeepEval logo
DeepEval

Observability· deepeval.com

Open source

Open-source evaluation framework for testing LLM apps, agents, RAG systems, and prompts with repeatable metrics, regression checks, and CI-friendly workflows.

18,360
Open source
MLflow logo
MLflow

Observability· mlflow.org

Open source

MLflow is an open-source AI engineering platform with GenAI evaluation, tracing, monitoring, and optimization workflows for agents, LLM apps, and models.

28,106
Open source
OpenPipe ART logo
OpenPipe ART

Observability· art.openpipe.ai

Open source

Agent Reinforcement Trainer for improving LLM agent reliability with GRPO-based reinforcement learning workflows.

10,727
Open source
Opik logo
Opik

Observability· comet.com

Open source

Open-source LLM observability and evaluation platform from Comet for tracing, prompt management, testing, and agent optimization.

22,172
Open source
Phoenix logo
Phoenix

Observability· arize.com

Open source

Open source AI observability and evaluation platform for tracing LLM applications, running evals, and debugging agent behavior with OpenTelemetry.

11,557
Open source
Portkey logo
Portkey

Observability· portkey.ai

Freemium

AI gateway and observability layer for routing, guardrails, caching, logging, and spend control across LLM providers behind one API.

13,037
Open source
Promptfoo logo
Promptfoo

Observability· promptfoo.dev

Open source

Open-source testing, red-teaming, and evaluation framework for prompts, RAG, and agents.

25,319
Open source

Promptfoo is open source against Langfuse's freemium model.