LangSmith vs PostHog

LangSmith

PostHog

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.

PostHog · 14 features

• A/B Testing — Experiments with significance analysis.
• Data Pipelines — Export events to BigQuery, Snowflake, S3.
• Data Warehouse — Query external sources (Stripe, Hubspot, S3) alongside events with SQL.
• Error Tracking — Sentry-style error tracking in same platform.
• Feature Flags — Rollout flags with targeting, A/B testing, JSON payloads.
• LLM Analytics — Tracing + cost tracking for OpenAI, Anthropic, Gemini, etc.
• Logs — Centralized log ingest with free 50 GB/month.
• Product Analytics — Events, funnels, trends, retention, paths. SQL insights available.
• Revenue Tracking — Integration with Stripe for revenue + churn metrics.
• Self-Hosting — Docker/Helm. Full feature parity with cloud.
• Session Replay — Watch user sessions. Privacy controls, masked inputs, JS errors.
• SQL Query API — Run ClickHouse SQL over your events via API.
• Surveys — In-app surveys + feedback widgets.
• Workflows — Trigger emails/webhooks on events.