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Comparison

LangSmith vs Comet Opik

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

Comet Opik

Open-source eval and tracing from Comet.

  • + Open source with self-host option
  • + Backed by Comet's MLOps experience
  • − Smaller community than Langfuse
  • − UI less polished than paid rivals
Spec LangSmith Comet Opik
Category eval-observability eval-observability
License Proprietary Apache-2.0
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 python, typescript
GitHub stars — 19.8k
Last activity — 2026-06-25