Langfuse
Open-source traces for LLM apps.
Tracing and prompt management you can self-host. Framework-agnostic relative to LangSmith.
Provisional seed scores. Method seed-v0-provisional, confidence low, not hands-on tested. The band around a number is a ±8 display label, not a measured interval. Ordering uses the point estimate.
The dollar amount is not a score. Rankings do not read it.
API flag: seed says yes. MCP flag: not marked. These flags are notes, not an audit. Marked open source.
No public affiliate program was recorded for this tool in the Oct 14, 2026 research, or it was not checked. Absence of a program does not change any score.
We may earn a commission if a tracking link is connected and you buy through it. It never changes ranks. In this v1 seed, tracking URLs are empty, so “Open site” goes to the vendor. Sponsorship rules.
Observability · role rank 1
Open source, self-hostable, broad integrations.
83
75–91 · low confidence
Observability · role rank 1
Open-source tracing and prompt management.
82
74–90 · low confidence
82
74–90 · low confidence
82
74–90 · low confidence
81
73–89 · low confidence
Observability · role rank 1
Open-source traces if you want to leave the LangChain family.
81
73–89 · low confidence
80
72–88 · low confidence
No release on file. That is not the same as stale.
No score revisions on file. These seed scores have not been through the pipeline.