Langfuse
NewOpen Source Agent Evals & Observability
#27 of 45 in Observability50,000 customers (per langfuse.com)50% positive in AI answers
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
- Langfuse ranks #27 of 45 in Observability with an AI visibility score of 1.4 (SlateIndex, Nov 3, 2026).
- Langfuse is most visible on Perplexity (4.1) and least on Google AI Mode (0).
- AI engines name Langfuse in 3 of the 60 Observability buyer prompts SlateIndex tracks.
- apica.io is the source AI engines cite most in answers about Langfuse, with 1 citations.
About
Company details for 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. It ranks #27 of 45 in Observability on SlateIndex and has a visibility score of 1.4 in the latest weekly run.
It has raised about $4M. Its differentiator: an open-source (MIT) LLM engineering platform that can be self-hosted, built on the OpenTelemetry standard.
- Website
- langfuse.com
- Categories
- Observability, MLOps Platforms
- Company type
- Division of ClickHouse
- Funding
- Seed · $4M raised
- Customers
- 50,000 · per langfuse.com
- Pricing
- Free; paid from $29 / mo · usage-based
- Free trial
- Free plan available
- Deployment
- Langfuse Cloud in US, EU, Japan and HIPAA regions, or self-hosted under the MIT license
- Platforms
- Docker Compose, Kubernetes (Helm), AWS (Terraform), GCP (Terraform), Azure (Terraform)
- Integrations
- 100+ native
- Languages
- 8 supported
- Compliance
- SOC 2 Type II, ISO 27001, HIPAA-ready region, GDPR
- Support
- Community support via GitHub, In-app support, Private Slack or MS Teams channel on Pro and Enterprise plans, Named lead support engineer on Enterprise plans
Read from langfuse.com, g2.com, github.com · refreshed Nov 2, 2026.
AI visibility
Latest weekly run · Nov 3 · next run Nov 9
Visibility score trend
Weekly runs over the last 60 days, with up to 7 competitors. Click a name to hide or show its line.
Changes appear after the second weekly run in Observability. Datadog leads the category at 69.5%.
Media
Website and product screenshots for Langfuse
AI mentions & citations
Recent answers that name Langfuse
Best observability platform with AI features
Choose Braintrust or Langfuse if your main problem is evaluating and debugging LLM or agent behavior rather than monitoring conventional infrastructure.
Which observability tools offer annual discounts?
Langfuse Cloud: Qualifying early-stage startups receive 50% off for 12 months.
Products & features
What Langfuse sells
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.
Strengths engines cite
- Discounted cloud pricing for qualifying early-stage startups
- Well suited to evaluating and debugging LLM or agent behavior
Target market & buyers
Developers and AI engineering teams, from startups to large enterprises
Notable customers include Ramp, Canva, Khan Academy, DKB, Merck, SumUp, Hugging Face, Cresta.
| Industry | Primary use case |
|---|---|
| Design software | Tracing and debugging generative design features in production (Canva) |
| Education | Building and improving the Khanmigo AI tutoring assistant (Khan Academy) |
| Banking | Keeping an AI banking assistant accurate and compliant (DKB) |
| Customer support | Deflecting support conversations to AI agents (SumUp) |
Funding & recent developments
Funding
| Round | Year | Amount |
|---|---|---|
| Seed | 2023 | $4M |
| Latest known round | Total raised |
|---|---|
| Seed | $4M |
Recent developments
- Mar 2026ProductObservations-centric data model
Langfuse shipped an observations-centric data model with a claimed 10x or more dashboard speedup, laying groundwork for v4.
- Mar 2026ProductLangfuse v4 released
Langfuse v4 went live on Langfuse Cloud and for self-hosters.
- Jan 2026CompanyLangfuse acquired by ClickHouse
ClickHouse announced the acquisition of Langfuse on January 16, 2026, with the deal value not disclosed.
Competitive landscape
How Langfuse compares with its top three alternatives
Langfuse most often appears alongside Datadog, New Relic, Dynatrace in AI answers.
What AI answers say
Sentiment and themes from the answers that mention this brand
Positive 50% · Neutral 50% · Mixed 0% of 2 engine answers that mention Langfuse
Praised for
- Discounted cloud pricing for qualifying early-stage startups
- Well suited to evaluating and debugging LLM or agent behavior
Criticised for
Pricing
Usage-based pricing with a free plan
Cite as: SlateIndex, “Langfuse AI visibility profile”, https://slateindex.ai/brand/langfuse, data of Nov 3, 2026. Licence: CC BY 4.0.