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Introduction

LangWatch is an AI engineering platform designed to enhance the development and deployment of AI agents. It offers a suite of tools for testing, evaluating, and observing LLMs, ensuring reliability and preventing regressions. Key features include:

  • AI Agent Testing: Simulate user interactions to test agent performance.
  • LLM Evaluation: Evaluate LLMs using a variety of metrics and simulated scenarios.
  • LLM Observability: Monitor and debug LLMs in real-time to identify and resolve issues.
  • Regression Prevention: Prevent regressions by tracking changes and identifying potential problems.
  • Collaboration: Facilitate collaboration between technical and non-technical team members.
  • Open Source & Self-Hostable: Offers both cloud and self-hosted options for flexibility and control.

LangWatch targets AI engineers, data scientists, and product managers involved in building and deploying AI agents. It helps them to design smarter agents with evidence-based insights, reduce rework, manage regressions, and build trust in their AI systems.

Latest News

LangWatch Goes Open Source: May 2026 Update

LangWatch Goes Open Source: May 2026 Update

8/4/2026

LangWatch Goes Open Source: May 2026 Update # The Whole Platform Is Now Open Source: LangWatch May 2026 Update May was our biggest month yet: the full LangWatch platform went open source under Apache 2.0, voice testing landed in Scenario, the new Traces UI hit GA, and AI Governance opened for beta.....

Introducing Langy: Your Automated AI Engineer

Introducing Langy: Your Automated AI Engineer

8/4/2026

Introducing Langy: Your Automated AI Engineer # Introducing Langy: Your Automated AI Engineer Langy is a full coding agent inside LangWatch: it reads your production traces, writes Scenario tests and evaluations, opens the pull request on your codebase, and proves the change in your CI. Rogerio C...

LangWatch v3.0: April 2026 Product Updates

LangWatch v3.0: April 2026 Product Updates

8/4/2026

# LangWatch v3.0 and the April 2026 Product Drop April was our biggest release month yet: LangWatch v3.0 goes live, Agent Skills spin up whole eval platforms in a session, and Scenario learns to red team. By Manouk Draisma · April 30, 2026 Canonical: https://langwatch.ai/blog/langwatch-monthly-dr...

Things you can ask Langy, the automated AI engineer

Things you can ask Langy, the automated AI engineer

8/4/2026

Things you can ask Langy, the automated AI engineer # Things you can ask Langy The real questions teams ask Langy about their agents, and how it answers them from your traces and code, then opens the fix as a PR. Rogerio Chaves· July 23, 2026 · Product Releases Langy is the automated AI engineer...

We Red-Teamed Our Own AI Agent: 14 Bugs Found

We Red-Teamed Our Own AI Agent: 14 Bugs Found

8/4/2026

We Red-Teamed Our Own AI Agent: 14 Bugs Found # We Red-Teamed Our Own AI Agent and Found 14 Real Bugs Langy is the AI agent LangWatch runs on its own product. A teammate distracted it with an unrelated coding question, and it forgot what it was doing. Here's what we found once we went looking for .....

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FAQ

User Reviews

4.8/5.0
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Pricing

Pricing Model: Freemium

Developer

Get started with LLM monitoring and evaluation. Includes all platform features, 1000 traces /month (additional: €5 / 10k traces), 30 days data access, 2 users, Community Support.

Free
Launch

For small teams optimizing their LLM apps. Includes everything in Developer, 20k traces / month (around 120k events, additional: €5 / 10k traces), 180 days data access, 3 users.

€59/month
monthly
Enterprise

Self-hosting, enterprise-grade support and security features. Includes custom traces, audit logs, custom users, Uptime & Support SLA, Custom Terms, DPA and SLA, Dedicated Support Engineer.

Custom

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