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Comparison

Langfuse vs OpenLLMetry

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Langfuse

The most-used open-source LLM observability tool.

  • + Open source and self-hostable
  • + Framework-agnostic via OpenTelemetry
  • − Self-hosting ClickHouse is operational work
  • − Eval features trail dedicated eval tools

OpenLLMetry

OpenTelemetry instrumentation for LLMs.

  • + Vendor-neutral instrumentation
  • + Works with existing observability stacks
  • − Instrumentation only, no UI
  • − Needs a backend like SigNoz or Honeycomb
Spec Langfuse OpenLLMetry
Category eval-observability eval-observability
License MIT Apache-2.0
Open source Yes Yes
Self-hostable Yes Yes
MCP support No No
Pricing freemium free
Starting price Self-host free; cloud tier Free
Models multi multi
Languages python, typescript python, typescript
GitHub stars 29.8k 7.2k
Last activity 2026-06-25 2026-06-25