2.0 alpha
These docs describe 2.0. Install it with @once-ui-system/core@alpha.
On 1.8.x? Read the 1.x docs
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v2.0.0-alpha.0 Form with intent

Open-source frontend infrastructure for the AI-native web

Install Once UI

Start from a prompt

Each one points your agent at the harness and the blocks that match the task. Fill in the angle brackets and paste.
Set your agent upRun once per project. Writes AGENTS.md and a Cursor rule so every later prompt starts from the rules instead of guessing.
Landing pageHero, proof and a call to action. Pulls the waitlist, header and footer blocks so the page has real structure rather than three stacked sections.
Pricing pageTiers, a comparison and the FAQ underneath. The bundle carries the layout decisions that make three columns survive a phone.
DashboardSidebar, stat row and a data table. Dashboard1 and Table1 show how the charts and the table are meant to sit together.
Chat interfaceThread list, message feed and composer. Chat1 and Feed3 handle the scroll and streaming behaviour that is tedious to get right by hand.
Sign in and sign upBoth screens, with validation and error states wired to the form controls rather than bolted on afterwards.
SettingsSectioned preferences with the controls people expect - switches, selects and a destructive action that asks first.
RoadmapShipped, in progress and planned, with the status treatment already decided so the three states read differently at a glance.

Bootstrap a whole app

Pro
Pro templates ship the parts a prompt cannot invent - payments, auth, a schema - so the agent adapts a working app instead of starting from an empty page.
StorefrontMagic Store on Fourthwall: catalogue, product pages, cart and checkout. Fourthwall handles payment, shipping and fulfilment, so the build is the storefront rather than the commerce backend.
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Built with curiosity by Lorant One and the Design Engineers Club