A agentindex
Comparison

Laminar vs LangSmith

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

Laminar

Open-source observability and eval for AI agents.

  • + Open source with a Rust core for performance
  • + Built-in eval and datasets
  • − Smaller community
  • − Newer project

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
Spec Laminar LangSmith
Role Observability Observability
Tags observability, evaluation, persona-data-scientist, persona-platform-engineer observability, evaluation, persona-data-scientist, persona-platform-engineer
License Apache-2.0 Proprietary
Open source Yes No
Self-hostable Yes No
MCP support No No
Pricing freemium freemium
Price Free tier Free
Usage cost No model cost No model cost
Models multi multi
Languages typescript, rust python, typescript
GitHub stars 3.1k —
Last activity 2026-07-03 —