LangWatch
Tests and evaluates AI agents to improve reliability and governance.
What is LangWatch?
LangWatch is an AI Agents tool that tests and evaluates AI agents to improve reliability and governance. LangWatch is a paid tool. It is aimed at developers and ai teams.
LangWatch tests and evaluates AI agents to turn unpredictable systems into reliable production systems. It offers simulations, evaluations, observability, and governance features. Designed for developers and teams managing AI agents.
Built for developers and ai teams.
Key capabilities
Features
Simulate
Write Scenarios
Allows creating test scenarios using Claude Code.
Local and CI
Red Teaming
Tools and Skills
Whitebox and Blackbox
Evaluate
LLM as a Judge
Notebook or UI
Online Evaluations
Pairwise
Multimodal
Use cases
- Simulate real user interactions for AI agent testing
- Write test scenarios using Claude Code for agent evaluation
- Conduct red teaming to test AI agent security
- Evaluate AI agent performance with LLM as a judge
- Perform online evaluations of AI agents
- Compare agent outputs using pairwise evaluation methods
Who it's for
Pros & cons
Pros
- Public API available
- Usage-based pricing
- Custom/enterprise pricing via sales
Cons
- No free plan
Pricing
Paid.
| Plan | Price |
|---|---|
| Growth | €29 |
AI models
Developer & API
Public SDK API available
Open source· Apache-2.0· 4.9K stars· 408 forks
Security & compliance
- ISO 27001
- GDPR
- SSO
- SAML
- Data deletion
As stated on LangWatch's website — not independently verified by AiByts.
FAQ
What is LangWatch?
LangWatch is an AI Agents tool that tests and evaluates AI agents to improve reliability and governance. LangWatch tests and evaluates AI agents to turn unpredictable systems into reliable production systems. It offers simulations, evaluations, observability, and governance features. Designed for developers and teams managing AI agents.
Is LangWatch free?
No, LangWatch is a paid tool.
How much does LangWatch cost?
LangWatch offers one plan: Growth (€29).
Does LangWatch have an API?
Yes, LangWatch offers a public SDK API for building custom integrations.
Who should use LangWatch?
LangWatch is built for developers and ai teams. Common uses: simulate real user interactions for AI agent testing, write test scenarios using Claude Code for agent evaluation, conduct red teaming to test AI agent security and evaluate AI agent performance with LLM as a judge.
What does LangWatch integrate with?
LangWatch integrates with AWS, Google Cloud, Azure, Vercel, OpenAI, Anthropic and LangChain.
Is LangWatch open source?
Yes, LangWatch is open source under the Apache-2.0 license.
What are the best alternatives to LangWatch?
Similar tools on AiByts include ChatGLM, Plurai, Yasmine Works, Groas and Grok.
LangWatch news & updates
Details are compiled from LangWatch's website and public sources, last verified Oct 5, 2026. Features and pricing change — confirm on the official site before you buy.
Try LangWatch
Paid
Comments
Sign in to join the discussion.