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14,448 startups · 29 programs

Langfuse

Acquired · Open source LLM engineering platform

WebsiteYC profile

Why it ranks

How the rank works
21signal of 100 · rising 7

A sum of public facts, not a judgement and not investment advice.

Competitors

AI.txtShared: source llm, openSeedcamp 2023Startup →AIPareaShared: llm application, prompt, evaluationYC S23New York CityStartup →AIAcquiredHumanloopShared: prompt management, llm, evalYC S20San FranciscoStartup →AIInactiveBricksAIShared: llm application, metric, openYC S22San FranciscoStartup →AITensorlakeShared: llm application, managementPlug and PlayUnited StatesStartup →
Companies closest to Langfuse
Company
.txtShared: source llm, openSeedcamp 2023Not statedAI, Devtools
PareaShared: llm application, prompt, evaluationYC S23ActiveAI, Devtools
HumanloopShared: prompt management, llm, evalYC S20AcquiredAI, Devtools
BricksAIShared: llm application, metric, openYC S22InactiveAI, Devtools
TensorlakeShared: llm application, managementPlug and Play Not statedAI, Data

Adjacent

AIQuery VaryShared: llm applicationYC W22San FranciscoStartup →AILiteLLMShared: source llm, openYC W23San FranciscoStartup →AIThe Token CompanyShared: improve llmYC W26San FranciscoStartup →AILangwatchShared: entire lifecycle, monitorAntler 2023NetherlandsStartup →AIOpenToolsShared: llmYC S23San FranciscoStartup →
Companies next to Langfuse
Company
Query VaryShared: llm applicationYC W22 +1ActiveAI, Devtools
LiteLLMShared: source llm, openYC W23ActiveAI, Devtools
The Token CompanyShared: improve llmYC W26ActiveAI
LangwatchShared: entire lifecycle, monitorAntler 2023Not statedAI
OpenToolsShared: llmYC S23ActiveAI, Devtools

Also from W23 in AI

All of W23
AIAcquiredHeliconeLLM Observability for DevelopersYC W23San FranciscoStartup →AIAcquiredDAGWorks Inc.Open source tools & services for reliable AI Agents & AI ApplicationsYC W23San FranciscoStartup →AIAcquiredFernInstantly offer SDKs and API DocsYC W23New York CityStartup →AIInfisicalSecurity infrastructure for developers and agentsYC W23San FranciscoStartup →AIAcquiredOpenIntOpen Source Embedded Product IntegrationsYC W23RemoteStartup →AIAcquiredOuterbaseThe interface for your databaseYC W23PittsburghStartup →
Company
HeliconeLLM Observability for Developersteam of 5acquiredAcquiredAI, Data, Devtools
DAGWorks Inc.Open source tools & services for reliable AI Agents & AI Applicationsacquiredteam of 2AcquiredAI, Devtools
FernInstantly offer SDKs and API Docsteam of 30acquiredAcquiredAI, Devtools
InfisicalSecurity infrastructure for developers and agentsteam of 70hiringActiveAI, Devtools
OpenIntOpen Source Embedded Product Integrationsacquiredteam of 4AcquiredAI, Data, Devtools
OuterbaseThe interface for your databaseacquiredteam of 4AcquiredAI, Data, Devtools

About Langfuse

Traces, evals, prompt management and metrics to debug and improve your LLM application. Onboard via https://langfuse.com Langfuse helps you build and improve LLM applications across the entire lifecycle: - Develop: Observability, Langfuse UI & Prompt Management - Monitor: Traces, Analytics, Metrics & Evaluations - Test: Experiments, Releases & Datasets We are hiring: https://langfuse.com/careers Langfuse joined Clickhouse in Jan 2026 where the founders now continue to build the team.

YC batch
W23 · Winter 2023
Status, per YC
Acquired
Category
AI, Data, Developer tools
Team size
26
Location
Berlin, Berlin, Germany
Checked
6h ago

YC tags: Developer Tools, Generative AI, Analytics, Open Source, AI

Changes seen

Team sizeOct 5, 2026

Team went from 19 to 26 people.

Source ↗

Langfuse in W23: 274 companies, 69% AI

Company profileAcquisitionsPaydaysproblemsReleasessocialsstandards

Langfuse: questions

Which YC batch was Langfuse in?

Langfuse was in Y Combinator's Winter 2023 batch (W23).

Is Langfuse still active?

Y Combinator lists Langfuse as acquired.

Where is Langfuse based?

Langfuse lists Berlin, Berlin, Germany as its location on YC's directory.