Fusion - Vibe code at any scale
Fusion links directly to your GitHub repos and learns your design system and APIs, then uses AI to generate and visually edit production-ready UI code in place. It opens a branch, pushes a PR, and spins up a live preview for every change.
Replies
Builder.io
Hi all! I'm Steve, co-founder and CEO of Builder.io
We're excited to launch Fusion - the first vibe coding tool that integrates directly with your existing codebase, design system, and workflows.
Current AI coding tools force a trade-off: either powerful but dev-only, or easy to use for anyone but can't work with real codebases at scale. We wanted both.
Quick tutorial to get started:
Connect your GitHub repository (or start fresh with a prompt)
Import your Figma designs or describe what you want to build
Watch as Fusion generates code using your actual design system
Edit visually with a Figma-like editor, but with full code precision
Create PRs that your dev team can review and ship
What excites me most is seeing designers finally control how their work looks in production, PMs shipping changes without waiting for dev cycles, and developers focusing on logic while AI handles the visual implementation.
See the full announcement and demos: builder.io/blog/introducing-fusion
We would love to hear how it works for your team!
Builder.io
This sounds insanely powerful I can’t wait to see what everyone builds!
Builder.io
The ability to vibe code visually with my actual codebase, design systems, and APIs is super exciting!
Builder.io
@vishwas_gopinath_ph vibe coding for any repo!
Fusion sounds like a powerful bridge between design and code. Learning your design system and APIs directly from your repo, then generating production-ready UI with built-in PRs and previews — that's a huge time-saver for teams building at scale.
Builder.io
@supa_l thanks Supa - would love for you to try it out and share how your experience is as well!
Easy to connect directly to my gh while offering a figma-esq editing experience - w/ this vibe coding approach it is exactly what cross-functional teams need (that's me basically lol) Excited to see where you take this, Steve!
Builder.io
@cranqnow thanks Sam! try it out sometime and hit me with your feedback too
@steve_sewell Would be my pleasure to do so :)
Builder.io
Visual editing that actually works with real codebases = game changer 🔥
I'm impressed! I was able to create my own application that leveraged our existing design system using Fusion.
Looks pretty amazing!
Could Fusion be used to vibe code a new backend client management system for an existing SaaS product? i.e. Connect to a github repository and then talk to AI to create internal dashboards and recreate other tools/interfaces for onboarding and managing complicated client configurations.
Also, are you required to feed it a "design system" or can you have it create one from scratch?
Builder.io
@jashenk yes and yes! - absolutely can update backends for an existing saas product, and absolutely can be used without an existing system system (aka can create from scratch just fine)
@steve_sewell Awesome! Thanks for confirming. I'm assuming all changes/iterations it creates can be safely kept in a separate sandbox rather than making any changes to production code without explicit consent?
Builder.io
@jashenk correct! changes are in a separate sandbox and anything you want to bring to your main codebase you can send a pull request for and be reviewed before merging
Codejet
Huge congrats on the Builder.io launch! 🚀 Fusion’s vibe coding—AI-driven visuals that sync with your codebase, design system, and workflows—is a game-changer
🎊 Congratulations on the official release of Fusion!
Now, we can create and edit production-ready UIs quickly, intelligently, and efficiently. With automated PR features and live previews, Fusion is truly changing the way modern developers work. Keep working for the future 🌠🌠🌠
I can finally vibe code using my DS and components 🙌 🙌
Builder.io
@gustavo_garcia13 you know it!
The ability to make and apply visual changes with a rich visual editor without knowing the underlying code is a feature of Fusion I haven't seen in other products. Nice!
The vibe coding experience you'll offer sounds great. Does it work for both backend and front end applications?
Wow! This looks amazing.