LangSmith

Tracing and evals for LLM apps.

Is LangSmith right for you?

LangSmith is ranked #4 of 5 in Testing & debugging on ShipStack. Best for: Debugging agents. Deep agent observability.

Error monitoring and performance tracing, with AI debugging (Seer).

💲 Developer free; Team $26/mo; Business $80/mo (annual)

Best for: Production error tracking

Industry standard

Open-source end-to-end browser testing framework.

Best for: E2E tests agents can write

Free, agent-friendly

AI code review on pull requests.

💲 Paid tiers $24, $48, $72/user/mo (annual)

Best for: Catching bugs in AI-written PRs

Popular AI PR reviewer