Relay - AI Chat UI Kit for Next.js - Next.js AI Chat UI Kit Template

Relay is a chat UI kit, not a SaaS starter - the homepage IS the product: the real ChatWindow component, filling the viewport, no marketing site to gut and rewrite first. Type a question and watch it stream token by token through useChatStream, click an inline citation to see the quoted source in a popover (every citation also rolls up into a Sources card list below the reply), or ask for something like a pricing card and watch a canvas slide open on the right with a live, sandboxed HTML preview - the same pattern as ChatGPT Canvas or Claude Artifacts - with a Code tab, Copy, and Download. Sign in (any email/password) for the full threaded app: a persistent sidebar grouped by Today/Yesterday/Earlier, saved conversations, a Settings page with usage stats and a real Cmd+K shortcut, and a feedback row under every reply with a 'Retry with another model' dropdown that actually regenerates with the picked model. ModelSelector works on plain 'provider/model' strings, matching the Vercel AI Gateway convention, so swapping Claude for GPT is a string change, not a rewrite. The 'Wire' design system runs cool near-black surfaces with a vivid antique-brass accent, Big Shoulders display type over Archivo body text and IBM Plex Mono for every streamed token and citation stamp - fully responsive, audited with axe-core across every route in both themes, flash-free dark/light mode. Runs fully seeded with zero config - documented seams for a real database, auth provider, and the Vercel AI Gateway.