Langfuse

Langfuse

Verified

Open-source LLM observability platform for debugging AI applications.

FreemiumFree plan available
LLM application tracingPrompt version managementCost and latency monitoringEvaluation pipelines+2 more
Pricing
Freemium
Free plan available
Features
6 listed
Key capabilities
Use Cases
4 listed
Identified use cases
Access
Web App
Browser-based
Listed on Nextool since Feb 2026Verified by Nextool

About Langfuse

"Debug, trace, and improve your LLM app"

Langfuse is an open-source LLM observability and evaluation platform that helps AI engineering teams trace, monitor, evaluate, and debug their language model applications in production. It captures detailed traces of every LLM call, prompt version, and user interaction — providing the visibility needed to understand latency, cost, quality regressions, and user satisfaction across complex AI pipelines. AI product teams at startups and enterprises use Langfuse to systematically improve their LLM applications post-deployment, catching quality issues before they impact users and informing data-driven improvements to prompts and models.

Key Features

6
LLM application tracing
Prompt version management
Cost and latency monitoring
Evaluation pipelines
User feedback collection
Open-source and self-hostable

Best For

4 use cases
Debugging LLM application issues
Tracking prompt performance over time
Monitoring AI costs in production
A/B testing prompts
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Official Links

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Tool Details

Pricing
Freemium
Platform
Web
Best For
Debugging LLM application issues
Features
6 listed
Categories
2
Listed
Feb 2026
Verified Tool
Reviewed by our editorial team
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