LangWatch

LangWatch - the measurement layer for AI agents

About LangWatch

LangWatch is a platform designed for teams developing and deploying AI agents, offering tools to test, evaluate, and monitor large language model (LLM) agents in complex, multi-step scenarios. It supports simulation-based testing, allowing users to run realistic user scenarios, evaluate agent responses, and monitor production performance. The platform includes features for prompt management, red-teaming, and observability, and works with various agent frameworks without requiring code rewrites. LangWatch provides both cloud and self-hosted deployment options, with a free tier available and paid plans that scale with usage and team size.

Best for: AI engineering teams, Product managers, Developers building LLM agents, Enterprises deploying AI agents

Key features

Simulates realistic user interactions with AI agents for multi-turn testing
Evaluates agent responses for quality, accuracy, and policy adherence
Provides observability into agent steps, costs, and latency in production
Supports prompt management with versioning, deployment, and A/B testing
Offers adversarial testing to uncover safety and security gaps
Integrates with multiple frameworks and supports both local and CI/CD runs
Allows evaluation of text, images, and mixed media outputs
Provides both cloud and self-hosted deployment options

Use cases

Testing AI agents with simulated user conversations before deployment
Evaluating production agent performance and identifying regressions
Red-teaming agents to identify vulnerabilities and unsafe behaviors
Managing and versioning prompts for continuous improvement
Monitoring token usage and costs for AI agent operations
Running evaluations and experiments from notebooks or the UI

Pros

Free tier available for getting started
Open-source scenario SDK for Python and TypeScript
No credit card required to begin using the platform
Supports both cloud and self-hosted deployments

Limitations

Free tier limited to 50k events/month, 14-day data access, and 2 users

Screenshots

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