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assistant-ui (YC W25) — Open source React.js library for AI chat

assistant-ui appears in Y Combinator's company directory in the Winter 2025 batch, listed 2025-02-06. Open Source React.js Library for AI Chat.

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assistant-ui: Accepted into Y Combinator Winter 2025

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assistant-ui

New accelerator entry · 2025-02-06 · the record

Winter 2025
batch
3
people
Early
stage
United States of America
region
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In their words

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.

What the record says

BatchWinter 2025
Announced2025-02-06
StageEarly
StatusActive
Team size3
IndustryB2B
Sub-industryB2B -> Infrastructure
SectorsDeveloper Tools, Generative AI, Chat, Web Development, AI Assistant
RegionsUnited States of America, America / Canada
BasedSan Francisco, CA, USA
HiringNo
Sitehttps://assistant-ui.com

The full profile

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If you're behind assistant-ui: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. FoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.

Sourced from the company's Y Combinator directory entry.

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Permanent URL: https://mentionfox.com/funding/yc-assistant-ui
Last updated 2026-09-26
Primary record: Y Combinator directory entry
assistant-ui (YC W25) — Open source React.js library for AI chat. MentionFox, 2026-09-26. https://mentionfox.com/funding/yc-assistant-ui