Traces

Evaluations

Agent Simulation

Prompts

Datasets

Analytics

Annotations

Optimization

Traces

Evaluations

Agent Simulation

Prompts

Datasets

Analytics

Annotations

Optimization

Traces

Evaluations

Agent Simulation

Prompts

Datasets

Analytics

Annotations

Optimization

Trusted by AI innovators & global enterprise

Trusted by AI innovators & global enterprise

Trusted by AI innovators & global enterprise

300k+

300k+

300k+

Monthly installs

100h+

100h+

100h+

Saved on quality control per week

Saved on Quality
control per week

2.3k+

2.3k+

2.3k+

Github stars

Complete visibility into your production AI...

Complete visibility into your production AI...

1

Build

2

Evaluate

3

Deploy

4

Monitor

5

Optimize

Use case

Design smarter agents with evidence, not guesswork

Design smarter agents with evidence, not guesswork

LangWatch helps teams simulate AI agents, track responses, and catch failures before production. Built-in tools for data selection, evaluation, and testing let you move fast while staying in control. Reduce rework, manage regressions, and build trust in your AI.

LangWatch helps teams simulate AI agents, track responses, and catch failures before production. Built-in tools for data selection, evaluation, and testing let you move fast while staying in control. Reduce rework, manage regressions, and build trust in your AI.

python

Typescript

uv add langwatch

python

Typescript

uv add langwatch

python

Typescript

uv add langwatch

Framework Flexible

Works with any LLM app, agent framework, or model

Works with any LLM app, agent framework, or model

OpenTelemetry native, integrates with all LLMs & AI agent frameworks

Evaluations and Agent Simulations running on your existing testing infra

Fully open-source; run locally or self-host

No data lock-in, export any data you need and interop with the rest of your stack

Is LangWatch right for you?

Collaborate with your entire team

Collaborate with your entire team

LangWatch enables both non-technical & technical users to collaborate on running experiments,
evaluating datasets and managing prompts and flows.

LangWatch enables both non-technical & technical users to collaborate on running experiments,
evaluating datasets and managing prompts and flows.

AI Engineer

Access everything in just a few lines of code. Everything in LangWatch works with or without your code. Engineers are able to run prompts, flows, and evaluations programmatically, while non-technical users can use the UI.

Data Scientist

Product Manager

Domain Experts

AI Engineer

Access everything in just a few lines of code. Everything in LangWatch works with or without your code. Engineers are able to run prompts, flows, and evaluations programmatically, while non-technical users can use the UI.

Data Scientist

Product Manager

Domain Experts

AI Engineer

Data Scientist

Product Manager

Domain Experts

Empower non-technical team members to contribute to AI quality. Let them easily build evaluations and annotate model outputs, bringing them into the quality testing loop.

Enterprise-grade controls:
Your data, your rules

Enterprise-grade controls:
Your data, your rules

Self-hosted or
Hybrid deployment

Self-hosted or
Hybrid deployment

Self-hosted or
Hybrid deployment

GDPR
Compliance

Role-based
access controls

Use custom models
& integrate via API

FAQ

Frequently Asked Questions

Frequently Asked Questions

How does LangWatch work?

How does LangWatch work?

How does LangWatch work?

What is LLM observability?

What is LLM observability?

What is LLM observability?

What are LLM evaluations?

What are LLM evaluations?

What are LLM evaluations?

Is LangWatch self-hosted available?

Is LangWatch self-hosted available?

Is LangWatch self-hosted available?

How does LangWatch compare to Langfuse or LangSmith?

How does LangWatch compare to Langfuse or LangSmith?

How does LangWatch compare to Langfuse or LangSmith?

What models and frameworks does LangWatch support and how do I integrate?

What models and frameworks does LangWatch support and how do I integrate?

What models and frameworks does LangWatch support and how do I integrate?

Can I try LangWatch for free?

Can I try LangWatch for free?

Can I try LangWatch for free?

How does LangWatch handle security and compliance?

How does LangWatch handle security and compliance?

How does LangWatch handle security and compliance?

How can I contribute to the project?

How can I contribute to the project?

How can I contribute to the project?

Ship agents with confidence, not crossed fingers

Get up and running with LangWatch in as little as 5 minutes.

Ship agents with confidence, not crossed fingers

Get up and running with LangWatch in as little as 5 minutes.

Ship agents with confidence, not crossed fingers

Get up and running with LangWatch in as little as 5 minutes.