The request "agent-ui" is a name, not an exact product; the closest match in the list is assistant-ui, a React library for building AI chat and agent interfaces 1. Alternatives that build agent UI components include 21st, aparte, and openuidev 238.
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21st21st.devverified and signed
A library of hand-crafted React and Tailwind CSS components and templates that can be installed with one command, including for AI agent chat UIs 212.
official:MCP server · 21st.dev+1 community tools built for it
for agents: agent-elements · 21st-ai · 21st-ui-build
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aparteapartejs.devwebsite read, tools not yet checked
Open-source AI chat and agent UI components built as Web Components, covering streaming, tool approval, and branching across React, Vue, Svelte, and Angular 3.
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OpenUIopenui.comwebsite read, tools not yet checked
Open-source infrastructure for AI apps and agents to respond with interactive UI, using your own components and design system 8.
+1 community tools built for it
Sources
- 1assistant-ui · The frontend library for AI agentsassistant-ui.com · read 2026-10-29
- 2React Components, Templates & Themes — 12,000+ Crafted UI | 21st21st.dev · read 2026-10-29
- 3AI Chat & Agent UI Components — React, Vue, Svelte, Angularapartejs.dev · read 2026-10-30
- 8OpenUI - The Open Standard for Generative UIopenui.com · read 2026-10-30
- 11assistant-ui: declares "assistant-ui" (the record we read and signed)unfragile.ai · read 2026-10-24
- 12agent-elements: declares "agent-elements" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
assistant-ui · assistant-ui verified and signed
Overview and router for assistant-ui, the React library for building AI chat interfaces from composable primitives and a styled elements catalog. Use for high-level, cross-cutting, or architecture questions: choosing packages, picking a runtime, or understanding the layers (elements, primitives, the
agent-elements · agent-elements verified and signed
Use whenever the user wants to build or modify a chat, agent, or tool-calling UI in a React 19 + Tailwind v4 project — especially if the code imports from `@/components/agent-elements/*` or the project has that folder on disk. Triggers: "agent chat", "tool call UI", "streaming chat", "plan approval"
· aparte website read, tools not yet checked
Open-source AI chat and agent UI as Web Components: streaming, tool approval, branching, a UI kit, local LLMs — in React, Vue, Svelte, Angular or plain HTML.
anti-ui-slop · anti-ui-slop verified and signed
Stop coding agents from shipping generic UI. Use UIZZE's 800,000+ real web and iOS screens to build product-specific interfaces, define a design contract, cover required states, and run a hard finish gate. Use when designing, implementing, redesigning, critiquing, or pre-ship reviewing a web or iOS
· AgentsKit website read, tools not yet checked
Build agents without gluing many libraries together. A composable TypeScript foundation for runtime, tools, memory, RAG, and chat interfaces.
· assistant-ui Studio Starter website read, tools not yet checked
Open-source React components and runtimes for building AI chat. Streaming, tools, and persistence in TypeScript.
· assistant-ui Docs website read, tools not yet checked
Components, runtimes, and primitives for building AI chat interfaces in React, Vue, React Native, and the terminal.
ai-search-instance-chat-completion · Cloudflare API verified and signed
Chat Completions
yapstudios · Metabind verified and signed
Use when building MCP Apps (AI-powered tools that render native
· openuidev website read, tools not yet checked
Open-source infrastructure for AI apps and agents to respond with interactive UI, not just text. Build with your own components, models and design system.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.