What they do
open-source tracing, evals and prompt tools for LLM apps
How close to us
3, close
checks only; observability for AI apps sold to developers, W2-adjacent but not about business output or cost; acquired
Wedges
- W2 Seeing whether your AI agents actually produce adjacent
L1 Company brain (knows the organisation) 0, none
L2 Agent team (runs agents, tools, approvals) 0, none
L3 Does and learns (finishes, checks, measures, updates the brain) 1, light
Who buys
- Firm size
- mid-market
- Buyer type
- developer
- Role
- AI engineer or head of engineering
- UK
- not known
Their own description (from YC)
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.
Full teardown
No full teardown yet. On the deep list.
Technical detail
- Slug
- langfuse
- Lens hash
- 179096c479
- Pass
- screen
- Stale
- no