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Once UI
Open-source design system and component library for Next.js and Figma, with deployment-ready application templates.
Quick Facts
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Key Features
- → 100+ pre-styled MIT-licensed React components
- → Semantic Row, Column and Grid layout primitives
- → Theme and style management from a single file
- → Matching Figma design library with synced tokens
- → 100+ copy-paste blocks and 11 app templates
- → App-level state management for themes, toasts, icons and layouts
- → Agent-first harness for generating Once UI code with minimal context
- → Charts built on Recharts
Pros
- Large open-source core under MIT with no vendor lock-in
- Yearly price is locked in for the lifetime of the subscription
- Endorsed publicly by the co-founder of Grafana Labs
- Strong template library covering portfolio, docs, store and AI-agent apps
Cons
- Purchases appear to complete on once-ui.com behind auth rather than via the Lemon Squeezy storefront, so affiliate attribution is unverified
- Free templates are CC BY-NC and personal-use only — commercial rights require a paid plan
- Plan cards and the comparison table quote different Pro prices ($193 vs $256)
- Manual approval, a 7-day cookie, and a commission ceiling that maps to no published plan
- Uses a limited-spots scarcity line on the pricing page
Technical Performance
Lighthouse Audit
Speed
74/100 C
Accessibility
80/100 B
Best Practices
100/100 A
SEO
83/100 B
Core Web Vitals
LCP 2.6s
FCP 1.2s
CLS 0.062
TBT 810ms
Speed Index 4.3s
Performance data measured via Google Lighthouse. Fast load times indicate a well-optimized product that won't slow down your workflow.
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Category
Tags
design-systemreactnextjsfigmacomponentstemplatesopen-source