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langsmith alternative·updated oct 2026

failproof vs langsmith

the langsmith alternative for teams that want agent-runtime reliability across any stack - not tracing and evals tied to LangChain.

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Failproof AI

End-to-end reliability for AI agents. Traces every run at the agent runtime, scores every finished session in the cloud with code checks, LLM judges and the eval set you already have (DeepEval, Ragas, promptfoo or your own), brought in as it is, finds where agents fail on its own, and lets you author and enforce a policy that stops the bad action in realtime - deployed on-prem or in the cloud.

LangSmith

Tracing and evals for LangChain and LangGraph. Deeply integrated with that stack - datasets, prompt hub, annotation. Best inside the LangChain ecosystem.

capabilityFailproof AILangSmith
Built forAI agentsLangChain apps
Works with any frameworkAny agent / harnessLangChain & LangGraph
Agent-level tracingAgent runtime, deeperChain / model level
Autonomous failure findingAutomaticNo
Policy authoringYesNo
Realtime policy enforcementYes, realtimeNo
Prompt hub & eval datasetsNoYes
DeploymentLocal, on-prem, cloudCloud (self-host Enterprise)

Choose Failproof AI when

  • you run high-impact autonomous agents that take real actions
  • a wrong action is costly or irreversible
  • you need to stop failures at runtime, not just trace them
  • you want an end-to-end reliability solution, on-prem or cloud

Choose LangSmith when

  • you are all-in on LangChain / LangGraph
  • you want a prompt hub and dataset-based evals
  • you need chain- and graph-aware tracing

FAQ

Does LangSmith enforce policies?

It traces and evaluates; enforcing an action at runtime is not its job (LangGraph recursion limits are in-framework config, not a policy across agents). Failproof AI authors and enforces policy at the runtime, framework-agnostic.

Does Failproof AI work without LangChain?

Yes - it is framework-agnostic and hooks into any agent runtime, LangChain or not.

Can I use both?

Yes - trace LangChain apps in LangSmith, enforce every agent with Failproof AI.

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