# Application Shell 21 - AI chat shell with conversation history

> An application shell for AI chat apps with conversation history grouped by date, a model picker in the header, and a message composer pinned to the bottom.

A paid shadcn/ui block sold by the [@shadcnblocks](https://shadcnblocks.com/?utm_source=shadcn.exchange) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/shadcnblocks/application-shell21).

- Page, with a preview: https://shadcn.exchange/r/shadcnblocks/application-shell21
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/shadcnblocks/application-shell21-light-8eb9570b17b1d041.png
- Listed: 2026-10-16

## Buy and install

@shadcnblocks 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/shadcnblocks/application-shell21