Fusion
Builder.io’s open-source-inspired framework for building AI-enhanced visual development tools with composable, reactive UIs.
At a Glance
Pricing
Get started with Fusion at no cost with Up to 10 users and 25 monthly AI credits (10 daily limit).
Try Fusion for 14 days with access to Free trial available.
Engagement
Available On
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Developer
Updated Feb 2026
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 Plan Available
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
14 days
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
