Once UI Handbook
Beginner Guides
What is Once UI?
Install & config
Page skeleton
Your first page
Build And Launch
How to launch a portfolio site that actually gets you hired
How to build a documentation site with MDX and Next.js
How to ship a landing page and dashboard with authentication in Next.js
How to launch a social app with Next.js and Supabase
Vibe Coding
Introduction to vibe coding
Set up your local dev environment
Essential tools for vibe coding
Build your first Once UI app
Common Patterns
Hero section
Static panel
Form layout
Highlighted card
Responsive stacking
Decoration layers
Dialog & modal
Toast & feedback
Tables & lists
Loading states
App shell navigation
Dashboard & charts
Chat & messaging
Auth & verification
Settings & split panels
Data filters & toolbar
Command palette
Pricing & plans
Accordion & FAQ
Media & uploads
Empty & error states
SEO, Open Graph, and structured data
Documentation code blocks with live preview
Carousels, galleries, and before/after comparisons
Date pickers and scheduling
Context menus and dropdown actions
Tags, chips, and multi-value inputs
Roadmap & kanban
Form inputs & controls
Progress, status & badges
Scrolling & feeds
Profile, avatars & identity
Social proof & logo clouds
Masonry & media grids
Table pagination, search & bulk selection
Banners & announcements
Footer layouts
Onboarding & first run
Waitlist & coming soon
Design Tips
Color & surfaces
Harness overview
Row, Column & Grid
Spacing & rhythm
Icons & buttons
Reveal & motion
Theme tokens, FOUC-free init, and runtime style controls
Tooltips and hover cards
Block updates
Block updates changelog
Agent Resources
Column, not Flex
Semantics over CSS
Typography scale
Common gotchas
Block anchors
Validate generated code
Pro block registry
Match task bundles
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Once UI Handbook
Beginner Guides
What is Once UI?
Install & config
Page skeleton
Your first page
Build And Launch
How to launch a portfolio site that actually gets you hired
How to build a documentation site with MDX and Next.js
How to ship a landing page and dashboard with authentication in Next.js
How to launch a social app with Next.js and Supabase
Vibe Coding
Introduction to vibe coding
Set up your local dev environment
Essential tools for vibe coding
Build your first Once UI app
Common Patterns
Hero section
Static panel
Form layout
Highlighted card
Responsive stacking
Decoration layers
Dialog & modal
Toast & feedback
Tables & lists
Loading states
App shell navigation
Dashboard & charts
Chat & messaging
Auth & verification
Settings & split panels
Data filters & toolbar
Command palette
Pricing & plans
Accordion & FAQ
Media & uploads
Empty & error states
SEO, Open Graph, and structured data
Documentation code blocks with live preview
Carousels, galleries, and before/after comparisons
Date pickers and scheduling
Context menus and dropdown actions
Tags, chips, and multi-value inputs
Roadmap & kanban
Form inputs & controls
Progress, status & badges
Scrolling & feeds
Profile, avatars & identity
Social proof & logo clouds
Masonry & media grids
Table pagination, search & bulk selection
Banners & announcements
Footer layouts
Onboarding & first run
Waitlist & coming soon
Design Tips
Color & surfaces
Harness overview
Row, Column & Grid
Spacing & rhythm
Icons & buttons
Reveal & motion
Theme tokens, FOUC-free init, and runtime style controls
Tooltips and hover cards
Block updates
Block updates changelog
Agent Resources
Column, not Flex
Semantics over CSS
Typography scale
Common gotchas
Block anchors
Validate generated code
Pro block registry
Match task bundles
Beginner Guides

Install & config

Install @once-ui-system/core and wrap your app in providers.
Updated 19d ago
What is Once UI?
Page skeleton
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5 min · Beginner · Start
Install @once-ui-system/core, wrap your app in providers, and you're ready to build.

Install

Once UI targets Next.js App Router (React 18+). The package includes components, SCSS tokens, contexts, and the AI harness under @once-ui-system/core/ai/.

Minimal setup

Wrap your root layout with the theme and layout providers from the package:
  • Import @once-ui-system/core/styles once in your root layout
  • Wrap children with ThemeProvider and LayoutProvider from @once-ui-system/core
Full setup code and provider options are in the config guide.

Config (optional)

Most projects work with defaults. When you need customization:
  • Theme — color scheme, accent, border style, surface fill via provider props or data attributes on the html element
  • Layout — max content widths, breakpoint values via the layout provider

Dev workflow

To iterate on the library while building an app: The apps/dev sandbox in the monorepo is a live component playground — useful for seeing variants before you write docs or lessons.

Check yourself

  • Global styles imported in root layout
  • Theme and layout providers wrapping children
  • No Tailwind or global CSS fighting Once UI tokens

Next step

→ Your first page
npm install @once-ui-system/core
# Terminal 1 — watch the core package
pnpm --filter @once-ui-system/core dev

# Terminal 2 — run your app
cd apps/dev && pnpm dev