A agentindex
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
Role Observability Observability
Tags observability, evaluation, persona-data-scientist, persona-platform-engineer observability, evaluation, persona-data-scientist, persona-platform-engineer
License Proprietary Apache-2.0
Open source No Yes
Self-hostable No Yes
MCP support No No
Pricing freemium freemium
Price Free Free tier
Usage cost No model cost No model cost
Models multi multi
Languages python, typescript python, typescript
GitHub stars — 20.3k
Last activity — 2026-07-03