LangWatch
Founder here. Langy is an AI engineer that lives inside our platform, LangWatch. It reads your production traces, writes Scenario tests and evaluations for the problems it finds, opens a pull request on your repo, and proves the fix by running those simulations in CI. A human still merges. Reachy robot from Hugging Face arrived on the same week we were planing on launching it, so we wanted to use for the launch. So we it wired to our Langy which actually lives on the platform, and asked it to test our own customer-support voice agent. On the video you can see it writing the agent tests…
LangWatch launched on April 24, 2024 with 669 votes, #25 of 4,347 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
LangWatch is an open-source platform designed for developers working with large language models. It helps users understand, measure, and improve their LLM pipelines while addressing key risks including jailbreaking, sensitive data leaks, and hallucinations. The platform offers monitoring and analytics capabilities to track LLM performance and iterate on implementations more effectively.
written from the facts on this page · September 2026
From the sources
LangWatch provides an easy, open-source platform to improve and iterate on your current LLM pipelines, as well as mitigating risks such as jailbreaking, sensitive data leaks and hallucinations.
AI agent testing and evaluation that turns unpredictable agents into reliable production systems, with simulations, evals, observability, and governance.
Simulation-based AI agent testing and evaluation that turns unpredictable agents into reliable production systems. An agent can take a hundred paths to the same goal, testing them by hand catches only a few. The best teams run agent simulations as continuous testing and evaluation, so reliability climbs every release. Turn a production trace into a simulation and prove the fix. Real users, in text and voice, pushing your agent the way production will, before it does. Text and voice conversations from a simulated user that pushes your agent turn after turn, like the real world does. Describe the behavior you want to test in plain language, right from your editor, and Scenario writes the…from langwatch.ai
In the maker’s words, at launch
Founder here. Langy is an AI engineer that lives inside our platform, LangWatch. It reads your production traces, writes Scenario tests and evaluations for the problems it finds, opens a pull request on your repo, and proves the fix by running those simulations in CI. A human still merges. Reachy robot from Hugging…
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