# Langfuse

Langfuse is an open-source platform for tracing, evaluating and improving LLM applications and AI agents. It records hierarchical traces of LLM calls, tool invocations and retrieval steps, and runs LLM-as-a-judge, heuristic or human evaluators on production data and experiments. Teams can use it on Langfuse Cloud or self-host it under the MIT license. ClickHouse acquired Langfuse in January 2026.

Page: https://slateindex.ai/brand/langfuse · data of 2026-11-03

## Facts

- Company type: Division of ClickHouse
- Latest funding: Seed
- Deployment: Langfuse Cloud in US, EU, Japan and HIPAA regions, or self-hosted under the MIT license
- Best for: Engineering teams building LLM applications and AI agents that want open-source, self-hostable tracing and evaluation
- Compliance: SOC 2 Type II, ISO 27001, HIPAA-ready region, GDPR

## Products

- Observability: Hierarchical traces of LLM calls, tool invocations and retrieval steps, filterable by user, session, cost, latency or custom metadata.
- Evaluation: LLM-as-a-judge, heuristic functions or human review, run on production data or during experiments.
- Prompt Management: Prompts kept separate from code, with one-click deployments and rollbacks.
- Playground: Tests prompts on real production inputs and compares models side by side.
- Experiments: Defines test cases, runs experiments and compares results side by side.
- Human Annotation: Collaborative workflows to review traces and create golden datasets.
- Cost and Latency Monitoring: Dashboards and automated alerts for cost, latency and quality.
- Halo: In-app assistant that investigates production data and takes approved actions.

## Rankings

| Category | Rank | Visibility | Mentions |
|---|---|---|---|
| Observability | 27 of 45 | 1.4 | 2 |
| MLOps Platforms | 51 of 61 | 0.3 | 1 |

## By engine

| Engine | Visibility | Mention rate |
|---|---|---|
| chatgpt | 0.0 | 0.0% |
| google_ai_mode | 0.0 | 0.0% |
| perplexity | 4.1 | 7.4% |

## Definitions

- Visibility (0–100): how often and how high AI answers name the brand, weighted by position.
- Mention rate: share of collected AI answers that name the brand.
- Share of voice: the brand's mentions as a share of all brand mentions in the category.
- Citation authority: share of answers naming the brand that cite the brand's own site.

Cite as: SlateIndex, “Langfuse AI visibility profile”, https://slateindex.ai/brand/langfuse, data of 2026-11-03. Licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).