Fusion
Builder.io’s open-source-inspired framework for building AI-enhanced visual development tools with composable, reactive UIs.
At a Glance
About Fusion
Fusion is a new framework from Builder.io designed to build performant, AI-powered visual development tools. While source-available, it is part of Builder’s commercial platform and supports fine-grained reactivity, high-performance rendering, and custom visual editor creation. Inspired by modern frameworks like React and Solid, Fusion introduces a compiler-driven architecture for fast, composable UIs. It's designed to power internal tools at Builder.io and is now available for developers building visual CMS experiences, embedded editors, and AI-native applications.
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Pricing
Free
Get started with Fusion at no cost with Up to 10 users and 25 monthly AI credits (10 daily limit).
- Up to 10 users
- 25 monthly AI credits (10 daily limit)
- 1 space
- Integrations with GitHub, Figma plugin, VS Code extension
- Built-in MCP Servers
Free Trial
Try Fusion for 14 days with access to Free trial available.
- Free trial available
Pro
Professional plan with Up to 20 users and 100 monthly AI credits for power users.
- Up to 20 users
- 100 monthly AI credits
- +25 credits per $ for additional usage
- 30-day Activity History
- Standard Support
- Everything in Free
Enterprise
Enterprise-grade solution with Custom user seats and Custom AI Credits and dedicated support.
- Custom user seats
- Custom AI Credits
- Custom spaces
- Faster machines
- Custom RBAC
- Remote workspaces
- Custom MCP servers
- Component mapping
- SSO
- Uptime and Premium Support SLAs
- Assigned Customer Success Manager
- Add-ons: Use your own LLM, Private Slack Channel
- Everything in Pro
Capabilities
Key Features
- Composable visual UI framework
- Fine-grained reactivity with high performance
- Optimized rendering via compiler
- Built-in support for visual editing and low-code tools
- Fully typed TypeScript support
- Built for AI-native developer tools
Demo Video
