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Powered by Claude Sonnet 4.5

The Ultimate
AI Build System
for Roblox

Build anything in Roblox Studio with the world's best coding AI. Just describe what you want - Claude handles the rest.

We Handle the Hard Stuff

Powered by Claude Sonnet 4.5 - the world's best coding AI

Expert Luau AI

Claude Sonnet 4.5 is #1 on coding benchmarks. It understands Roblox APIs deeply and writes production-ready code.

Instant Builds

Describe any object, system, or mechanic. The AI generates complete Luau code in seconds.

Studio Plugin

One-click connection to Roblox Studio. Chat with the AI and watch your builds appear in real-time.

Pattern Recognition

Learns what makes a good model from thousands of examples across different categories.

Multi-Model AI

Supports multiple AI models allowing for tailored experiences and maximum reliability.

Version Control

Checkpoint your projects and rollback anytime. Never lose work.

Built for Performance

Claude Sonnet 4.5
AI Model
200K
Context Window
<5s
Response Time
#1
Coding AI

Don't Take Our Word for It

D
@DevMaster_YT
Roblox Developer

It's a very efficient tool to speed up your programming. While helping in areas where you get stuck, it overall helps the dev experience a lot.

S
@SmellyCoder5
Game Creator

Catalyst allowed me to code scripts I couldn't do before and learn off them. It's faster than other AI tools, putting the scripts into the right modules.

X
@Xander_2009
Studio Developer

It significantly cut the time it took to make my games. Great for quick prototyping and also helped with speeding up coding on larger projects.

Frequently Asked

Everything you need to know about Catalyst

Catalyst is perfect for Roblox developers of all skill levels. Whether you're just starting out or you're an experienced developer looking to speed up your workflow, our AI-powered tools can help you build faster and better.

Catalyst connects directly to Roblox Studio through a Studio plugin. You can install our official plugin by searching for 'Catalyst' in the Studio toolbox. Once installed, any code you write in Catalyst is synced automatically to your open Studio project.

Yes! Catalyst is fully compliant with Roblox's Terms of Service. We use official Roblox APIs and our plugin follows all Roblox guidelines. Many professional Roblox developers use AI tools like Catalyst to accelerate their development.

Catalyst is powered by Claude Sonnet 4.5, the world's best coding AI. We provide a seamless Studio integration that lets you build directly in Roblox with natural language prompts. Just describe what you want, and Catalyst generates production-ready Luau code instantly.

Catalyst is currently free during our beta period! We're focused on building the best possible product and gathering feedback from developers. Premium features may be introduced in the future.

Fast Prototyping for the Next Superstars

Join thousands of creators prototyping games with Catalyst.

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No project selected
Disconnected
Welcome to Catalyst. Select a project and start building.
Think Time
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About the AI

Powered by Claude Sonnet 4.5 - the world's best coding AI

Claude Sonnet 4.5
Primary

Anthropic's best coding AI. #1 on SWE-bench with 80.9% accuracy.

200K
Context
#1
Coding
Gemini 2.0 Flash
Fallback

Google's fast multimodal AI. Used when Claude is unavailable.

1M
Context
Fast
Speed
Groq (Llama 3.3)
Fallback

Ultra-fast inference on Llama 3.3 70B. Secondary fallback.

70B
Params
LPU
Hardware
Why Claude Sonnet 4.5?

Claude Sonnet 4.5 is the best coding AI available today. It scores 80.9% on SWE-bench Verified, outperforming GPT-4 and all other models on real-world software engineering tasks.

For Roblox development, this means better Luau code, more accurate builds, and fewer errors. Claude understands context deeply - it knows what a "car" looks like, what materials to use, and how to structure complex models.

No training needed. Claude already has extensive knowledge of Roblox development. This means consistent, high-quality results every time.

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3D Builder
AI Generate
Add Parts
Transform
Color
#4b974b
Material
Plastic Roughness: 50% | Metalness: 0%
Properties
0
0
Untitled x
Move
Rotate
Position 0 0 0
Rotation 0 deg 0 deg 0 deg
Size 4 1 2
Hierarchy

No parts yet.
Click "Add Parts" to start building!

Properties

Select a part to edit properties

UI Builder
UI Elements
Quick Actions
Canvas: 1920 x 1080
50%
Properties
Select an element to edit properties
Hierarchy
Drag elements onto canvas
Animation & Effects Browser
Preview
Select an item to preview
Toolbox
Quick Search
Asset Details
Analytics Dashboard
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CSS Style Manager
Favorites
All Styles
Mode
Live Preview

Sample Card

This is how your theme will look on cards and components.

Original Theme
0 lines
Glass & Transparency
Frosted Glass Transparent BG Glass Borders Blur Overlay
Corners & Shapes
Rounded (Small) Rounded (Large) Pill Shapes Sharp Edges
Effects & Shadows
Soft Shadows Hard Shadows Glow Effects Neon Glow Inner Shadows
Animations
Hover Effects Smooth Transitions Floating Elements Pulse Effects
Gradients
Linear Gradients Radial Gradients Gradient Borders Gradient Text
Live Preview

Sample Card

This shows how your theme will look.

Generated CSS
/* Your AI-generated CSS will appear here */