LangSmith
Unified observability & evaluation platform for LLM/agent applications — tracing, dashboards, alerts, feedback & evaluation.
76
Hero Score
Popularity
76
Performance
85
Ecosystem
75
Maturity
76
Dev Experience
68
⭐ 913 stars⬇ 19.1M downloads/wkFirst release: Jul 2023Last release: May 2026
Async Support: YesPlugin Extensions: HighSpeed: FastDoc Quality: Very highLearning Curve: Medium
Pros
- • Built by LangChain team with native integration for LangChain and LangGraph workflows
- • Comprehensive feature set including real-time tracing, evaluations, prompt management, and analytics dashboards
- • Enterprise-grade with low-latency tracing, OpenTelemetry support, and self-hosting options
Cons
- • SaaS-first platform requiring paid enterprise plan for full self-hosting capabilities
- • Tight coupling with LangChain ecosystem may not suit framework-agnostic teams
- • Can be overkill for small prototypes or simple single-model applications