Product Introduction
Fusion by Builder.io is an AI-powered visual development platform that integrates directly with GitHub repositories to generate and edit production-ready UI code while maintaining alignment with existing design systems and APIs. It automates code generation through AI analysis of connected design assets and codebases, then facilitates collaborative editing via visual tools alongside traditional code workflows. The platform streamlines deployment by automatically creating branches, pushing pull requests, and generating live previews for every change.
The core value of Fusion lies in bridging the gap between design intent and technical implementation at enterprise scale, enabling both developers and non-technical teams to collaborate on UI development without compromising code quality. It reduces repetitive coding tasks by 20-50% while enforcing organizational design standards through AI-assisted code generation. The platform accelerates feature delivery cycles by providing instant visual feedback loops integrated with version control systems.
Main Features
Fusion connects directly to GitHub repositories to analyze and utilize existing components, design tokens, and API endpoints when generating new UI code. This ensures generated code matches organizational patterns and avoids style inconsistencies across projects. The integration supports monorepos and polyrepo architectures with granular permission controls.
The Figma import feature converts design files into functional React components that automatically reference connected design system tokens. It maintains layer hierarchy fidelity while converting Figma constraints into responsive CSS rules. Developers can configure mapping rules to align Figma elements with existing code components.
Visual editing tools allow direct manipulation of generated UIs through a WYSIWYG interface that syncs with actual code changes. Users can drag-and-drop approved components, adjust styling through CSS-in-JS property panels, and test API connections visually. All modifications trigger real-time preview environments and create audit trails in Git history.
Problems Solved
Fusion eliminates the manual translation gap between design mockups and production code, which typically causes 30-60% of UI development time in enterprise teams. It prevents style drift by strictly adhering to connected design systems rather than creating new CSS rules.
The platform serves cross-functional teams where designers need to prototype interactively without deep coding skills, while developers require maintainable code output. It particularly benefits organizations managing multiple products with shared design systems across React, Next.js, and Qwik frameworks.
Typical use cases include rapidly prototyping A/B test variations for marketing pages, rebuilding legacy UIs to match updated design systems, and enabling product teams to create internal tools without blocking engineering resources. Enterprise users leverage it for multi-brand portal development with centralized component governance.
Unique Advantages
Unlike generic AI code assistants, Fusion maintains strict adherence to organizational design systems through contextual analysis of connected repositories rather than relying on generic patterns. It outputs code using existing component libraries rather than generating new custom elements.
The platform introduces visual conflict resolution tools that highlight discrepancies between Figma designs and implemented components. Its AI validation layer checks generated code against ESLint rules, accessibility standards, and performance budgets before committing changes.
Competitive advantages include SOC 2 Type II compliance for enterprise deployments, support for bringing custom LLMs through private API keys, and granular Git integration that works with existing CI/CD pipelines. The visual editor uniquely preserves React component structure during modifications unlike traditional page builders.
Frequently Asked Questions (FAQ)
How does Fusion ensure generated code matches our existing patterns? Fusion analyzes component APIs, PropTypes, and TypeScript definitions from connected repositories to create mapping rules. The AI generates code using your actual components rather than generic equivalents, with style enforcement through design token analysis.
Can non-developers safely use Fusion without breaking production code? All changes are made in feature branches with mandatory PR reviews before merging. The visual editor restricts modifications to predefined component props and approved style ranges, while developers can lock critical components from visual editing.
How does Fusion handle design system updates? When design tokens or components update in your repository, Fusion automatically reanalyzes dependencies and applies changes to generated UIs. Teams can configure update propagation rules either per-project or organization-wide through version tagging.
What frameworks does Fusion support? The platform currently supports React, Next.js, Qwik, Vue, and Angular with TypeScript. Framework-specific templates enforce best practices like React Server Components architecture and Qwik's resumability requirements.
How does the Figma integration handle complex components? Fusion maps Figma components to code components through a combination of layer naming conventions and property matching. Developers can define override rules for complex cases like responsive grids or stateful interactions through a JSON configuration interface.