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Logo of Langfuse

Langfuse

byLangfuse
in AI Evaluation and Observability Platforms
4.6

Overview

Product Information on Langfuse

Updated 12th February 2026

What is Langfuse?

Langfuse is a software designed to provide observability and evaluation for large language model applications. It allows developers to monitor prompt and response pairs, aggregate metrics, and track user feedback to gain insights into model behavior and performance. The software supports integrations with multiple programming languages and frameworks, enabling teams to analyze, debug, and iterate on prompts and workflows efficiently. Langfuse offers tools for versioning prompts, managing experiments, and capturing user interactions to facilitate continuous improvement of conversational AI products. By collecting and visualizing relevant usage and quality data, the software aims to streamline development and help businesses optimize their language model applications for production environments.

Langfuse Pricing

Langfuse software uses a usage-based pricing model with multiple plans, including a free tier with defined limits and paid plans that scale according to the number of requests, data retention periods, and team features. The software also offers an enterprise plan with custom options such as higher usage limits and advanced security or support features.

Overall experience with Langfuse

Software Developer
250M - 500M USD, Healthcare and Biotech
FAVORABLE

“Centralized LLM trace visualization improved debugging, but slow bulk queries persist”

5.0
May 20, 2026
This text serves as a placeholder and does not reflect the user’s review responses or opinions. This text serves as a placeholder and does not reflect the user’s review responses or opinions. This text serves as a placeholder and does not reflect the user’s review responses or opinions.
There are no reviews in this category.
CRITICAL

About Company

Company Description

Updated 10th February 2026

Langfuse is an open source platform focused on supporting the development, monitoring, evaluation, and debugging of AI applications using large language models. It addresses challenges in tracking and understanding AI system behavior by providing tools for tracing model outputs, managing prompts, integrating multiple frameworks, and analyzing metrics related to costs and performance. Langfuse allows for collaborative workflows by enabling annotations and review, supporting testing and evaluation pipelines to improve application quality. Its capabilities are designed to facilitate both technical and non-technical team members in managing AI model configurations and testing, streamlining the process of maintaining and improving AI systems in production environments.

Company Details

Updated 10th February 2026
Company type
Private
Year Founded
2022
Head office location
San Francisco, United States
Number of employees
2 - 10
Website
https://langfuse.com

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Key Insights

A Snapshot of What Matters - Based on Validated User Reviews

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Peer Discussions

Langfuse Reviews and Ratings

4.6

(5 Ratings)

Rating Distribution

5 Star
60%
4 Star
40%
3 Star
0%
2 Star
0%
1 Star
0%
Why ratings and reviews count differ?
  • Software Developer
    50M-1B USD
    Healthcare and Biotech
    Review Source

    Centralized LLM trace visualization improved debugging, but slow bulk queries persist

    5.0
    May 20, 2026
    We started using Langfuse while building internal LLM apps and honestly it became one of those tools that quietly turned into part of the stack pretty fast. Initially we only wanted prompt logging and tracing, but over time we ended up using the evaluations, prompt versioning, and dataset features a lot more than expected. The biggest thing for me was visibility. Before Langfuse, debugging LLM issues was painful because we had logs spread across APIs, app logs, and random monitoring dashboards. With langfuse, at least the prompt + response flow was centralized. This alone saved time during testing. That said, it's not perfect. Some parts feel very polished while others still feel early-stage, especially when workflows get more complex or traffic increases. But overall, it worked well for our use case, and I'd probably use it again for another AI product.
  • Software Developer
    50M-1B USD
    Healthcare and Biotech
    Review Source

    Centralized LLM trace visualization improved debugging, but slow bulk queries persist

    5.0
    May 20, 2026
    We started using Langfuse while building internal LLM apps and honestly it became one of those tools that quietly turned into part of the stack pretty fast. Initially we only wanted prompt logging and tracing, but over time we ended up using the evaluations, prompt versioning, and dataset features a lot more than expected. The biggest thing for me was visibility. Before Langfuse, debugging LLM issues was painful because we had logs spread across APIs, app logs, and random monitoring dashboards. With langfuse, at least the prompt + response flow was centralized. This alone saved time during testing. That said, it's not perfect. Some parts feel very polished while others still feel early-stage, especially when workflows get more complex or traffic increases. But overall, it worked well for our use case, and I'd probably use it again for another AI product.
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Reviewer Insights for: Langfuse
Performance of Langfuse Across Market Features

Langfuse Likes & Dislikes

Like

- Tracing is actually useful - The trace visualization helped a lot during debugging. Especially in multi-step LLM pipelines where retrieval, reranking, and generation all happen separately. - Prompt versioning is cleaner than managing prompts manually - Before this, prompts were sitting inside config files and random notebooks. Langfuse made experiments more structured. - Easy integration with existing AI stack - SDK setup was straightforward. We integrated it into FastAPI in maybe an hour or two. - Open source self-hosting flexibility - This helped with internal data concerns, at least during early testing.

Like

- Tracing is actually useful - The trace visualization helped a lot during debugging. Especially in multi-step LLM pipelines where retrieval, reranking, and generation all happen separately. - Prompt versioning is cleaner than managing prompts manually - Before this, prompts were sitting inside config files and random notebooks. Langfuse made experiments more structured. - Easy integration with existing AI stack - SDK setup was straightforward. We integrated it into FastAPI in maybe an hour or two. - Open source self-hosting flexibility - This helped with internal data concerns, at least during early testing.

Like

- Tracing is actually useful - The trace visualization helped a lot during debugging. Especially in multi-step LLM pipelines where retrieval, reranking, and generation all happen separately. - Prompt versioning is cleaner than managing prompts manually - Before this, prompts were sitting inside config files and random notebooks. Langfuse made experiments more structured. - Easy integration with existing AI stack - SDK setup was straightforward. We integrated it into FastAPI in maybe an hour or two. - Open source self-hosting flexibility - This helped with internal data concerns, at least during early testing.