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once-ui-system/core

Once UI Core

The creative web's open-source design system. Build beautiful, consistent UIs 60% faster.
Frameworks
Next.js + TypeScript + Sass
Version
1.1.2
Documentation
License
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Built Simple.
Built with elegance.

A fully custom design system with minimal dependencies. No Tailwind. No Radix. No CSS battles.
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Components

Advanced design solutions with minimal component APIs.

Styles

Endless customization managed in a centralized config.

Products

Deployment-ready solutions for your next product.

Community

A community of indie builders to share and learn from.
Mailbuddy UI built with Once UI
Enroll UI built with Once UI
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Less code.
More features.

Minimal dependencies

No Tailwind, Radix, or any other UI libraries underneath. Pure, controlled theming.

Easy installation

Simple setup process with clear documentation and examples.

Beginner friendly

Intuitive API that feels natural whether you're new to React or a seasoned pro.

Designed for vibe coding

AI coding assistants can guide you through the entire process.

Single config file

All design tokens (colors, fonts, layout) defined in one place.

Clean architecture

No utility class soup. Just semantic components with powerful props.

Build your product without overthinking

Install Once UI

Add the Once UI package to your Next.js project

Design your brand

Set up your brand colors, typography, and spacing in one file

Build your product

Use the components to create beautiful, consistent interfaces

Join the movement

Early access, featured profiles, and perks for community contributors

2,500+

Creators on email list

1,000+

Discord members

Weekly

Updates & maintenance

Packed with epic features

Fully custom UI framework
Fluid design tokens + full theme control
Pre-styled, logic-aware components
Natively built for Next.js
Products you can launch now
Real community, real visibility

Frequently Asked Questions

Got more questions? Email us at lorant@once-ui.com
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Build a better web

For creators who don't wait for permission