L
LangSmith
3
Observability and evaluation platform for LLM applications
commercialfreemium Trending
About
LangSmith is a developer platform for debugging, testing, evaluating, and monitoring LLM-powered applications. Built by the LangChain team, it provides detailed tracing of LLM chains and agents, dataset management for evaluation, annotation queues for human feedback, and production monitoring dashboards. It works with any LLM framework, not just LangChain.
Details
| Type | llm-observability |
| Integrations | LangChain, LangGraph, OpenAI, Anthropic, LlamaIndex, Instructor, Any LLM SDK |
| Cloud Support | Cloud-hosted, Self-hosted (Enterprise) |
Tags
observabilitytracingevaluationllm-monitoringdebuggingtestinglangchain
Quick Info
- Organization
- LangChain
- Pricing
- Free (1 seat, 5K traces/month) / $39/seat/month (Plus)
- Free Tier
- Yes
- Popularity
- 79/100
- MAU
- 100K+
- Updated
- Feb 19, 2026
Also in DevOps & MLOps
W
Weights & Biases
The AI developer platform for experiment tracking and model management
Commercialfreemium
Weights & Biases10.0KFree for individuals / Custom enterprise pricing
M
MLflow
Open-source platform for the complete ML lifecycle
OSSFree
Databricks20.0KFree (open-source) / Managed on Databricks
H
Helicone
Open-source LLM observability platform for monitoring costs and latency
OSSfreemiumTrending
Helicone5.1KFree (100K requests/month) / $25/month (Pro)