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Langfuse
Agent Evaluation Systems↑ Rising Signal
Open-source LLM observability and prompt management (MIT).
70MoatRank™
About
The open-source observability platform often called "open-source LangSmith." Acquired by ClickHouse in Jan 2026, gaining an enterprise-grade columnar backend; shipped a v4 SDK rewrite.
MoatRank™ Breakdown
Total Score70 / 100
Structural Integrity15/20
Behavioral Coherence13/20
Governance Maturity12/20
Adoption Legitimacy15/20
Composability Index15/20
Observation Timeline
Jan 15, 2026
Acquired by ClickHouse; ~27k GitHub stars
MIT-licensed; OpenTelemetry + LangChain/OpenAI SDK integrations; v4 SDK rewrite shipped Mar 2026.
Certification
↑ Rising Signal
Issued: Jun 25, 2026
Strong OSS traction and broad integrations; ClickHouse acquisition concentrates governance.