Flagsmith vs LangSmith

Flagsmith

LangSmith

Flagsmith · 14 features

• A/B Testing — Multivariate flag splits.
• Audit Log — Full history of flag changes.
• Change Requests — Approval workflow for flag changes.
• Edge API — Global low-latency flag eval.
• Feature Flags — Boolean + multivariate + JSON flags.
• Local Evaluation — Server SDKs eval flags locally — no per-req API call.
• Percentage Rollouts — Gradual traffic ramp.
• Remote Config — Non-boolean config values.
• Role-Based Access — Fine-grained permissions.
• Scheduled Flags — Time-based flag changes.
• Segments — Rule-based targeting.
• Self-Hosting — Docker/Helm install.
• SSO + SAML — Enterprise SSO.
• Webhooks — Outbound event streaming.

LangSmith · 14 features

• Alerts — Threshold alerts on latency, cost, eval metrics.
• Annotation Queues — Human-review workflows for trace quality rating.
• Custom Dashboards — Aggregate metrics dashboards per project/tag.
• Datasets — Collect examples → use as eval sets or training data.
• Evaluations — LLM-as-judge, embedding similarity, custom Python evaluators, offline batch eval…
• LangChain Integration — Auto-trace any LangChain/LangGraph run with env var.
• LangGraph Integration — First-class trace + eval for LangGraph agents.
• LLM Tracing — Automatic trace every LLM call + tool call + chain step.
• OpenTelemetry Export — Export traces as OTLP to Datadog/Honeycomb/etc.
• Playground — Test prompts + models inline before deploying.
• Prompt Canvas — Visual prompt editor with live test + eval.
• Prompt Hub — Public + private prompt library with versioning.
• Self-Hosted (Enterprise) — Docker + k8s deployment in your infra.
• Threads + Sessions — Group traces into conversational sessions.