Once UI
Build faster than AI with Once UI for Next.js
Radix UI
Open-source UI components for building accessible web apps
Updated February 2026
| Once UI | Radix UI | |
|---|---|---|
| Rating | 5.0★ | 5.0★ |
| Reviews | 2 | 24 |
| Pros | 4 | 10 |
| FactScore™ | 23.9 | 69.9 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Once UI — Pros
Lightning-fast frontend design Ready-to-use templates Real-time collaboration User-friendly interfaceBoth tools — Pros
—Only in Radix UI — Pros
Accessible UI components Developer experience Un-styled components React compatibility Community involvement Customizable Excellent documentation Fast performance Headless component library Theme componentOnly in Once UI — Cons
—Both tools — Cons
—Only in Radix UI — Cons
Customizable Limited built-in componentsDetails
| Once UI | Radix UI | |
|---|---|---|
| Categories | Interface design tools | Interface design tools, Engineering & Development, UI frameworks |
| Platforms | Web | Web |
| Became Popular | March 29, 2023 | December 17, 2020 |
| Website | once-ui.com | radix-ui.com |
Who Should Pick Which?
Choose Once UI if...
- Lightning-fast frontend design
- Ready-to-use templates
- Real-time collaboration
Choose Radix UI if...
- Accessible UI components
- Developer experience
- Un-styled components
With a FactScore™ of 23.9 vs 69.9, Radix UI leads in community reception. Once UI uniquely offers Lightning-fast frontend design and Ready-to-use templates, while Radix UI stands out for Accessible UI components and Developer experience.
What Users Say
Once UI
Hey Product Hunters! 🚀 After only a couple of days of purchasing Once.UI for Figma I had to share my experience using this game-changing design system. This comprehensive system & UI kit has c...
I just shared it with our designer, and they gave it a 5-star rating. This will significantly ease their collaboration with R&D!
Radix UI
Perfection! It really shows that you have thought about the DX and APIs all the way through, there are so many good and clever features here. I've always been a fan of Radix, but this is one level ...
So many websites have buggy dropdowns and modals. With Radix, these primitives just work, i.e., pressing ESC just closes a modal as you'd expect. No customization needed. Would love for them to exp...
As part of a larger effort to reduce complexity in our own codebase and increase accessibility of Strapi products, we've made the decision to migrate to Radix-UI primitives for many of our components
Related Comparisons
Frequently Asked Questions
Which is better, Once UI or Radix UI?
Based on FactScore™, Radix UI leads with a score of 69.9 vs 23.9. Radix UI has a higher rating of 5.0★ compared to 5.0★.
What are the pros of Once UI compared to Radix UI?
Once UI uniquely offers: Lightning-fast frontend design, Ready-to-use templates, Real-time collaboration, User-friendly interface.
What are the pros of Radix UI compared to Once UI?
Radix UI uniquely offers: Accessible UI components, Developer experience, Un-styled components, React compatibility, Community involvement.
Is Once UI better rated than Radix UI?
Once UI is rated 5.0★ from 2 reviews. Radix UI is rated 5.0★ from 24 reviews.
What is the FactScore™ of Once UI and Radix UI?
FactScore™ weighs rating and review volume together. Once UI scores 23.9 and Radix UI scores 69.9.
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