YC W25 · Active

assistant-ui

Open Source React.js Library for AI Chat

Class: Winter 2025
Status: Active
Industry: B2B
Location: San Francisco, CA, USA
Team size: 3

Website

About

assistant-ui helps frontend developers add AI chat to their apps. Our product is used by several dozen companies, like LangChain, Stack AI, Browser Use, and Athena Intelligence. We're building an open source Typescript/React library and a backend as a service, with first class integrations into popular agent frameworks like LangGraph and Vercel AI SDK.