# AI chat app shell with resizable thread sidebar, collapsible icon rail, and model picker

> AI chat workspace: resizable thread sidebar collapsing to an icon rail, pinned and grouped chats, a search palette, and a header model picker with memory toggle. shadcn Resizable, Sidebar, Dialog, ReUI Badge. Chatbot UI, AI assistant, LLM chat.

A paid shadcn/ui block sold by the [@reui](https://reui.io/?utm_source=shadcn.exchange) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/reui/app-shell-21).

- Page, with a preview: https://shadcn.exchange/r/reui/app-shell-21
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/reui/app-shell-21-light-17e618ca55fe7f95.png
- Listed: 2026-10-13

## Buy and install

@reui sells this block, and its code is not on shadcn.exchange. Buy it from the registry, which installs it for those who have: https://shadcn.exchange/out/reui/app-shell-21

## Dependencies

- npm packages: `cn`, `next-themes`, `react-resizable-panels`
- Registry items: `@reui/badge`, `avatar`, `button`, `collapsible`, `dialog`, `dropdown-menu`, `empty`, `input-group`, `item`, `kbd`, `resizable`, `scroll-area`, `sheet`, `sidebar`, `skeleton`, `tabs`, `toggle-group`, `tooltip`, `use-mobile`