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Best Alternatives to Langfuse

Observability · 8 alternatives ranked of 36 in the category

Looking for alternatives to Langfuse? These are the observability tools ranked using catalog signals, with what separates each one from Langfuse.

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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.

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19,261
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.

28,707
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.

10,822
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.

23,129
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.

12,113
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.

13,301
Open source
Promptfoo logo
Promptfoo

Observability· promptfoo.dev

Open source

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

26,809
Open source
Ragas logo
Ragas

Observability· ragas.io

Open source

Evaluation framework for testing RAG and LLM applications with metrics, synthetic test data, and CI-friendly quality checks.

16,247
Open source