A agentindex
Comparison

LangSmith vs SigNoz

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

LangSmith

LangChain's observability and eval platform.

  • + Best-in-class when you already use LangChain
  • + Strong tracing UX
  • − Proprietary and cloud-only
  • − Vendor lock-in to LangChain

SigNoz

Open-source OpenTelemetry observability.

  • + Unified app and LLM tracing on OTel
  • + Fully self-hosted, no vendor lock-in
  • − LLM evals via OpenLLMetry, not native
  • − More ops to run than a SaaS
Spec LangSmith SigNoz
Category eval-observability eval-observability
License Proprietary MIT
Open source No Yes
Self-hostable No Yes
MCP support No No
Pricing freemium freemium
Starting price Free developer tier Self-host free
Models multi multi
Languages python, typescript go, typescript
GitHub stars — 27.5k
Last activity — 2026-06-25