How to Build Your Own LangSmith
Replace LangSmith with a custom build. Observe, Evaluate, and Deploy Reliable AI Agents
Build Difficulty: 5/5
Build a working replacement in a weekend with AI tools
Estimated Timeline
Based on 36 features at Weekend Project difficulty, expect about One weekend with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Key Features to Replicate
Top features across 8 categories. See all 36 features
Deployment(5 features)
Deploy agents to production in one click with managed infrastructure
Ship and scale agents in production with infrastructure designed for long-running workloads that need human collaboration
Automatically scale agent deployments based on demand
Studio interface for managing deployed agents
Handle memory persistence across long-running agent executions
Security(4 features)
Authorization controls for agent access
Manage authentication and authorization for LangGraph APIs
Custom Single Sign-On configuration
RBAC for fine-grained permission management
Integration(3 features)
Trigger agent via API
Expose agent as MCP (Model Context Protocol) server
Add tools with remote MCP server
Observability(3 features)
See exactly what your agent is doing at every step with detailed execution tracking
Real-time streaming of intermediary steps and final output
Clear visibility into each step of agent execution to quickly identify issues and debug problems
Data Management(2 features)
Export large amounts of data in bulk
Convert live data into test datasets
Evaluation(2 features)
Turn live data into test datasets and score performance with automated evaluators and expert feedback
Evaluate agent performance with automated evaluators and expert feedback
Hosting(2 features)
Hybrid hosting option with SaaS control plane and self-hosted data plane
Fully self-managed hosting option in your VPC
Prompt Management(2 features)
Visual editor for auto-improving prompts
Manage and improve prompts in a centralized hub
Cost Calculator
Keep Paying LangSmith
Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 36 features at very easy complexity.