assistant-ui blog · Mar 2026
Announced multi-platform support for assistant-ui, including React Native, terminal (Ink), and a redesigned Assistant Cloud / Cloud AI SDK.
Open Source React.js Library for AI Chat
Company research
Public company, workplace, funding, and market signals
Updated Jul 30, 2026
Overview
assistant-ui is a San Francisco-based, YC-backed open-source React/TypeScript company that builds production-grade AI chat interfaces and a paid hosted backend (assistant-cloud) for thread persistence, analytics, and user management.
Primary product
Open-source React/TypeScript library for AI chat interfaces, plus the assistant-cloud managed backend.
Founded
2024
Headquarters
San Francisco, California, United States
Team size
4-9 employees (public sources vary)
Industry
Software Development
Sub-industry
AI chat UI / developer tools
Offices
San Francisco, California, United States
Business model
open-source software
subscription SaaS
enterprise software
custom/on-prem deployments
Funding
Stage
Seed
Total raised
$500K
Latest round
Seed · Feb 2025
Latest amount
$500K
Feb 2025 · Y Combinator
People & investors
Leadership
Founder & CEO
Investors
Work & culture
Small, open-source/devtools team with a fast-shipping culture; hiring language emphasizes full-time ownership, customer/community partnership, and solving hard edge cases in a high-ambiguity environment.
Compensation
Public San Francisco roles list $140k-$200k base salary plus equity for full-time positions.
Product & market
Pricing
assistant-ui is MIT-licensed and free; assistant-cloud is sold as a tiered SaaS with Free, Pro, and Enterprise/custom plans.
Differentiators
- —MIT-licensed open-source core
- —Composable React primitives rather than a monolithic chat widget
- —First-class integrations with AI SDK, LangGraph, LangChain, and other runtimes
- —Production UX features such as streaming, attachments, branching, and accessibility
- —Generative UI for tool calls rendered as React components
- —Multi-platform support for web, React Native, and terminal/Ink
- —Assistant-cloud for hosted thread persistence and analytics
Technology
TypeScript
React
React Native
Ink
Radix UI
shadcn/ui
Tailwind CSS
Vercel AI SDK
LangGraph
LangChain
Mastra
OpenAI
Anthropic
Google Gemini
Mistral
Perplexity
AWS Bedrock
Azure
Fireworks
Ollama
Customers
LangChain
Stack AI
Browser Use
Athena Intelligence
Competitors
Rasa
Sierra
Hyro
Scale & contact
Estimated revenue
≈$880K estimated ARR (GetLatka, 2025)
Estimated monthly visits
78.2K
Traffic estimate as of Jun 2026
Latest news
assistant-ui blog · Jan 2025
Covered shadcn/ui integration, thread-management improvements, AI SDK and LangGraph upgrades, and high package release velocity.
assistant-ui blog · Dec 2024
Showed assistant-ui powering a GitHub-query assistant and generative chart UI, demonstrating the product's use in data-devtools workflows.
LangChain · Sep 2024
LangChain collaboration post describing a tight LangGraph Cloud integration with assistant-ui for building stateful conversational agents.
Jobs and careers at assistant-ui
0 jobs at assistant-ui
No open positions
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