Langfuse

Freemium

langfuse.com

Open-source LLM engineering platform providing observability, tracing, prompt management, and evaluation metrics.

About Langfuse

Langfuse is an open-source observability and analytics platform engineered specifically for development teams building production LLM applications.

The system captures detailed distributed execution traces, input and output payloads, token counts, latency breakdowns, and monetary API costs across multi-step chains and autonomous agent runs.

Available as both self-hosted infrastructure and a SOC2-compliant cloud service, Langfuse features prompt version management, playground testing, automated evaluations, and user feedback collection.

Key Features

Core capabilities and technical highlights of Langfuse

Granular distributed tracing capturing inputs, outputs, token metrics, and execution latency.

Centralized prompt management dashboard supporting versioning, variable interpolation, and rollout labels.

OpenTelemetry-compliant SDKs available for Python, TypeScript, LangChain, and LlamaIndex integrations.

Evaluation playground facilitating model comparisons, dataset benchmarking, and automated scoring.

Popular Use Cases

How teams, developers, and creators get value from Langfuse

1Trace complex LLM application executions, nested function calls, and vector retrieval steps in production.

2Monitor API token consumption, dollar expenditures, and model latency bottlenecks in real time.

3Manage, version-control, and deploy prompt templates dynamically without redeploying application code.

4Track end-user feedback ratings and evaluate model output quality using automated LLM-as-a-judge scorers.

Frequently Asked Questions

Common questions and answers regarding Langfuse

Is Langfuse open source?

Yes, Langfuse is open source under an MIT license, allowing teams to self-host the complete backend via Docker.

Does Langfuse support both Python and TypeScript?

Yes, Langfuse maintains native SDKs for Python and TypeScript/Node.js, alongside integrations for LangChain and OpenAI.

Can Langfuse calculate LLM costs automatically?

Yes, Langfuse automatically calculates model token usage and associated costs for OpenAI, Anthropic, Bedrock, and other providers.

Is there a managed cloud version of Langfuse?

Yes, Langfuse Cloud offers a fully managed, SOC2-compliant SaaS platform with a generous free monthly hobby tier.

Does Langfuse store private prompt data securely?

Yes, Langfuse Cloud enforces enterprise data privacy protocols and offers complete self-hosting for strict regulatory compliance.

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Tool Specifications

Pricing Modelfreemium

CategoryCode & Development

Owner VerifiedNo

Listed DateOct 14, 2026

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