The web is no longer a flat place. Between WebGL, WebGPU, and the relentless push toward immersive experiences, developers are building 3D interfaces that seemed like science fiction just a few years ago. But here's the catch: building a 3D user interface from scratch is hard. Sliders, buttons, menus—all of these need to be reimagined for a spatial context, and most of us don't have weeks to reinvent the wheel.
Enter ThreeUI. Created by MengTo—the designer behind popular UI kits and design resources—this open-source project is a community catalog of live, interactive UI components built specifically for Three.js. It's free, it's modular, and it's packed with over 50 ready-made components. Whether you're building a browser-based game, a product configurator, or a data visualization dashboard, ThreeUI gives you the building blocks to make your 3D interface feel polished.
Here are ten reasons why ThreeUI deserves a spot in your development toolkit.
The core value of ThreeUI is simple: it gives you a massive library of UI components that already work in 3D space. And we're not talking about a few basic buttons here. The catalog includes:
Each component is designed for 3D environments, meaning they exist as mesh objects in the scene rather than as HTML overlays. They respond to raycasting, they have proper depth, and they integrate seamlessly with the lighting and perspective of your Three.js scene.
Example in action: A game developer uses ThreeUI's health bar component to display player status in a WebGL-based game. The bar floats above the character's head, rotates to face the camera, and updates smoothly as the player takes damage. No CSS hacks, no DOM overlays—just clean, native 3D UI.
Key Takeaway: You don't need to build every UI element from scratch. ThreeUI gives you a solid foundation of 50+ components, so you can focus on the unique parts of your project.
One of the most frustrating things about UI libraries is the documentation. You see a static screenshot, you download the component, and then you spend hours figuring out how it behaves. ThreeUI eliminates that problem with live, interactive previews.
The catalog is built as a web application where every component is rendered in real-time using WebGL. You can hover over a button, drag a slider, click through a menu—all before you write a single line of code. This gives you an immediate sense of:
This interactivity is a huge time-saver. Instead of guessing whether a component will fit your use case, you can evaluate it in seconds. It's like test-driving a car before you buy it—except here, the test drive is free and takes less than a minute.
Key Takeaway: Live previews mean no more guessing. You can evaluate components visually and interactively before committing to them.
Some UI libraries give you a compiled bundle and a vague promise that it works. ThreeUI takes the opposite approach: every single component includes its full, open-source code. No black boxes, no hidden dependencies, no "magic" that you can't inspect.
This transparency matters for several reasons:
The modular design means each component is independent and reusable. You can grab a single slider component without dragging in a dozen unrelated files.
Key Takeaway: Full source code means you're never stuck with a component that doesn't fit. Modify, extend, and learn—it's all open.
Three.js is the de facto standard for 3D in the browser. It's a JavaScript library that handles WebGL rendering, scene management, camera control, and animation—all with a well-documented API that has been battle-tested by thousands of developers.
ThreeUI is built directly on top of Three.js, which gives you several advantages:
If you're already using Three.js, there's no learning curve for the underlying technology. ThreeUI slots right into your existing workflow.
Key Takeaway: ThreeUI isn't a separate ecosystem—it's a natural extension of Three.js, giving you more tools without forcing you to learn a new rendering engine.
ThreeUI isn't a one-person project locked in a silo. It's a community catalog, and as of early 2025, it has received contributions from more than 20 developers. The repository has been forked over 100 times, which means people aren't just using it—they're actively building on it.
This collaborative approach has several benefits:
If you've built a component that works well, you can contribute it back. The project explicitly encourages this, and the contribution process is straightforward—fork the repo, add your component, and submit a pull request.
Key Takeaway: ThreeUI is growing because the community is building it together. Your contribution could be the next component that helps another developer solve a tricky problem.
Performance is critical in 3D web applications. Every draw call, every shader, every mesh matters—particularly on lower-end devices. ThreeUI takes this seriously, with components averaging under 10KB in size.
This lightweight approach means:
The project also follows best practices for performance in Three.js: using geometry instancing where appropriate, minimizing draw calls, and avoiding unnecessary scene re-renders.
Key Takeaway: In the world of 3D web apps, every kilobyte counts. ThreeUI's focus on lightweight components helps you maintain smooth performance.
Commercial UI kits for 3D development can cost hundreds of dollars per license. And even then, you're often locked into restrictive terms—no redistribution, no modification, no use in certain types of projects.
ThreeUI is distributed under an open-source license, which means:
For indie developers, startups, and students, this is huge. You get a professional-grade UI toolkit without spending a dime.
Key Takeaway: Open source isn't just about saving money—it's about having full control over your tools and being part of a collaborative ecosystem.
There's a common misconception that 3D UI is only for games. It's true that ThreeUI shines in gaming contexts—health bars, inventory menus, HUD elements—but the applications go far beyond that.
Consider these real-world use cases:
The components are designed to be generic enough for any 3D context, so don't let the "gaming" label limit your imagination.
Key Takeaway: ThreeUI is a general-purpose 3D UI toolkit. Whether you're building a game, a business tool, or an interactive marketing site, these components can elevate your interface.
Ready to dive in? Here's what you need and how to get started:
System requirements: - A WebGL-compatible browser (Chrome, Firefox, Safari, Edge—all modern browsers work) - Node.js and npm installed on your machine - Basic familiarity with JavaScript (Three.js knowledge helps, but isn't required)
Installation steps:
Clone the repository:
bash
git clone https://github.com/MengTo/threeui.git
Navigate to the project directory:
bash
cd threeui
Install dependencies:
bash
npm install
Start the development server:
bash
npm run dev
Open your browser and navigate to http://localhost:3000 to explore the component catalog.
The project also includes documentation and examples to help you understand how each component works. If you get stuck, the GitHub Issues section is a good place to ask questions, and the community is generally responsive.
Key Takeaway: Getting started takes less than five minutes. Clone, install, and start exploring.
ThreeUI started as a project in 2023 and has already gained significant traction. As of early 2025, the repository has over 1,000 stars on GitHub and has been featured in several developer newsletters. This growth reflects a broader trend: 3D web interfaces are becoming mainstream.
Several factors are driving this shift:
ThreeUI is positioned to be a key part of this ecosystem. As more developers contribute components, the catalog will grow. As the web platform evolves, ThreeUI will likely adapt to support new features and rendering techniques.
The project's roadmap is community-driven, which means the future is shaped by the people who use it. If you have ideas for new components, improvements to existing ones, or entirely new features, you have a voice in where this project goes.
Key Takeaway: ThreeUI is more than a tool—it's a bet on the future of 3D web interfaces. And that future is being built right now, by people like you.
ThreeUI is an open-source project by MengTo that provides a community catalog of interactive UI components for Three.js. It includes 50+ components like buttons, sliders, menus, health bars, and progress bars, all designed for use in 3D web applications.
ThreeUI was created by MengTo, a designer known for popular UI kits and design resources. The project is hosted on GitHub under the repository name MengTo/threeui.
Yes. ThreeUI is distributed under an open-source license, meaning it's free to use, modify, and redistribute. There are no licensing fees or usage restrictions.
The catalog includes buttons, toggles, sliders, dropdown menus, health bars, progress bars, checkboxes, radio buttons, text inputs, and more. Each component is modular and independent.
Basic JavaScript knowledge is sufficient to get started. Some familiarity with Three.js will help you customize components and integrate them into your projects, but the components are designed to be self-contained and easy to use.
Absolutely. The project encourages community contributions. You can fork the repository, add your own components, and submit a pull request. The contribution process is documented in the GitHub repository.
You need a WebGL-compatible browser (all modern browsers support this), Node.js, and npm installed on your machine. No special hardware is required.
Clone the repository from GitHub, run npm install to install dependencies, then npm run dev to start the development server. Full instructions are available in the repository's README.
Yes. The components are built with performance in mind, and the complete source code allows you to audit and customize everything. Many developers are already using ThreeUI components in production projects.
Yes. The components are built with WebGL, which works on mobile browsers. Performance considerations are always taken into account, though you should test on your target devices to ensure optimal frame rates.
ThreeUI is more than just a collection of UI components—it's a practical answer to a real problem. Building 3D interfaces from scratch is tedious, error-prone, and time-consuming. ThreeUI gives you a head start, with 50+ components that are live, interactive, and fully open-source.
Here's what you get:
The web is moving toward 3D, and tools like ThreeUI are making that transition easier. Whether you're building a game, a product configurator, a data visualization, or something entirely new, ThreeUI gives you the foundation to build better interfaces faster.
So go explore the ThreeUI repository on GitHub. Star it if you find it useful. And if you've built a component that works well, consider contributing it back—the community will thank you, and you'll be helping shape the future of 3D web interfaces.