Stop testing AI agents manually
Stop testing AI agents manually
Turn production traces into evals, compare prompts and models,
simulate end-to-end agentic systems and improve quality with every release.
The #1 AI engineering platform
to test your AI agents
pre- and in production
Turn production traces into evals, compare prompts and models,
simulate end-to-end agentic systems
and improve quality with every release.
Traces
Evaluations
Agent Simulations
Prompt Management
Collaboration
Auto-prompt optimization
Traces
Evaluations
Agent Simulations
Prompt Management
Collaboration
Auto-prompt optimization
Traces
Evaluations
Agent Simulations
Prompt Management
Collaboration
Auto-prompt optimization
Join 1000's of AI developers using LangWatch to ship complex AI reliably
Join 1000's of AI developers using LangWatch to ship complex AI reliably
Join 1000's of AI developers using LangWatch to ship complex AI reliably
480k+
480k+
480k+
Monthly installs
550k+
550k+
550k+
Daily evaluations to prevent hallucinations
Saved on Quality
control per week
5k+
5k+
5k+
Total Github stars
Prototype, evaluate and monitor AI features
Prototype, evaluate and monitor AI features
1
Build
2
Evaluate
3
Deploy
4
Monitor
5
Optimize
Ship Reliable AI
There’s a better way to ship reliable AI
There’s a better way to ship reliable AI
Most AI systems break in subtle ways, a model swap degrades quality, an agent behaves differently in production, or a prompt change introduces regressions.
Without structured evaluations and simulations, teams are relying on manual checks and production feedback to catch issues.
LangWatch provides a developer-first, but collaborative platform to define evals, run experiments, simulate multi-step agent behavior, and monitor production signals, so changes to prompts, models, or agents can be tested and validated before they ship.
Most AI systems break in subtle ways, a model swap degrades quality, an agent behaves differently in production, or a prompt change introduces regressions.
Without structured evaluations and simulations, teams are relying on manual checks and production feedback to catch issues.
LangWatch provides a developer-first, but collaborative platform to define evals, run experiments, simulate multi-step agent behavior, and monitor production signals, so changes to prompts, models, or agents can be tested and validated before they ship.
Build
Essential tools to develop agents faster and safer without slowing teams down
Essential tools to develop agents faster and safer without slowing teams down
Prompt & Model Management
Version, compare, and deploy prompt and model changes with full traceability. Roll out experiments safely using feature-flag–style controls, with clear audit trails for every change.
Real-time Evaluations
Create and tune custom evals that measure quality specific to your product real-time
LLM Observability
Instantly search and inspect any LLM interaction across environments. Debug failures, investigate incidents, and support audits with complete visibility from development through production.
Test
Clearly measure the impact of every update. Foster a culture of continuous experimentation
Clearly measure the impact of every update. Foster a culture of continuous experimentation
Agent Simulations for complex agentic AI
Run thousands of synthetic conversations across scenarios, languages, and edge cases
Batch Tests & Experiments
Run tests directly from the LangWatch platform or your code. Track the impact of every change across prompts and agent pipelines.
Auto-Evals
Automatically execute your full test suite with LangWatch, covering both pre-release testing and production monitoring.
Optimize
Build a continuous feedback loop that helps you ship AI products users genuinely trust and enjoy.
Data review & labeling
Collaborative workflows for teams to inspect, annotate, and analyze data together spotting patterns and sharing learnings across engineering, product, and business stakeholders.
Dataset management
Convert production traces into reusable test cases, golden datasets, and benchmarks to power experiments, regressions, and fine-tuning.
Performance optimization with DSPy
Systematically improve prompts, models, and pipelines using structured experimentation and optimization techniques
Seamless integration in your techstack
Works with any LLM app, agent framework, or model
Works with any LLM app, agent framework, or model
OpenTelemetry native, integrates with all models & 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
python
Typescript
uv add langwatch
python
Typescript
uv add langwatch
Collaborate to control reliable AI
Iterate, evaluate, monitor collaboratively
Iterate, evaluate, monitor collaboratively
The systhemetic way of testing that turns experiments into reliable AI
The systhemetic way of testing that turns experiments into reliable 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
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
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.
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
David Nicol
CTO - Productive Healthy Work Lives
Having evaluated numerous platforms, LangWatch was the only one that meaningfully resolved our quality gaps. The difference has been substantial
David Nicol
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
Enterprise-grade controls:
Your data, your rules
Enterprise-grade controls:
Your data, your rules
On-prem, VPC, air-gapped or hybrid
ISO27001, SOC2 certified. GDPR controlled
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?
What is LLM observability?
What is LLM observability?
What are LLM evaluations?
What are LLM evaluations?
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?
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?
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?
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.
Resources
Integrations
Resources
Integrations
Resources
Integrations