@assistant-ui

Reliable 100/100 · #1 of 342 scored

Radix-style React primitives for AI chat with adapters for AI SDK, LangGraph, Mastra, and custom backends.

@assistant-ui is a shadcn UI community registry. Its source repository is assistant-ui/assistant-ui , which has 12.4k GitHub stars, 1.2k forks and 162 contributors. The last commit was today (2357 commits in the last 90 days). The latest release is heat-graph@0.0.21. It scores 100/100 on Sealambda's maturity index, placing it in the Reliable tier.

Scoring

Maturity breakdown

100 / 100 · Reliable

0avoid · 305080 · reliable100

monorepo confidence 100% · weight backed by data

Maintenance ×35% 100 → +35.0

last commit 0d ago · 2357 commits/90d

Popularity ×20% 100 → +20.0

12.4k★ · 1.2k forks

Community ×20% 90 → +18.1

162 contributors · bus factor 2 · 84 watching

Responsiveness ×13% 89 → +11.6

1540/1724 issues closed (89%)

Hygiene ×12% 93 → +11.1

MIT · 75% health files

Signals

Repository facts

12.4k
Stars: 1.2k
Forks: 162
Contributors: 2
Bus factor: 184
Open issues: 1.5k
Closed issues: 2357
Commits (90d): TypeScript
Language: MIT
License: heat-graph@0.0.21
Latest version: 2254
Releases: today
Last commit

Classification

License, pricing and purpose

License: MIT · ✓ OSI-approved; Permissive: Use, change and redistribute freely, keeping the notice.
Access: FOSS; An OSI-approved or FSF-libre license, and everything offered is free.
Purpose: An open-source React component library and runtime system designed for building conversational AI interfaces and agent chat experiences.
Commercial model: Free; Everything the project offers is free to use, with no paid tier. Donations and sponsorships do not count as paid.
Tied to a service: No; Yes when the components are a client for a commercial API or service.
Scope: Domain-specific; Focused on one problem area, such as charts, AI chat, an editor, a status page or payments; an app adds it for that feature only.
Domains: AI & chat; AI & chat: Chat interfaces and components for AI assistants and LLM output.
Design: Vanilla shadcn; Looks like default shadcn/ui: the same shapes, spacing, borders and neutral palette, at most with another accent color.
Coverage: 11%; Share of shadcn/ui core primitives that the registry ships.
Design distance: 0.08; Measured on sample items: 0 is identical to vanilla shadcn/ui, 1 is entirely different.

Evidence

“The library is free forever under MIT. assistant-cloud is an optional backend for threads, history, and auth if you do not want to run that yourself.”
commercial · pricing ↗
“assistant-ui is an open-source TypeScript/React library to build production-grade AI chat experiences fast.”
scope · readme ↗
“Open-source React components and runtimes for building AI chat. Streaming, tools, and persistence in TypeScript.”
domains · homepage ↗
“Style every pixel yourself, or start from a polished shadcn/ui theme that the CLI copies into your project.”
design · readme ↗

AI-suggested by google/gemini-3.8-flash@Google AI Studio on 2026-10-02

Usage

Install

Add components from this registry with the shadcn CLI (configure the registry URL in your components.json):

pnpm dlx shadcn@latest add @assistant-ui/[component]

endpoint: https://r.assistant-ui.com/{name}.json

Homepage ↗ GitHub ↗

README

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