Spline vs Three.js: choosing the right path to 3D on the web

Last updated October 2026

Web 3D has split into two distinct workflows. On one side, designers drag objects around a visual canvas, light them, animate them, and publish interactive scenes without writing code. On the other, developers write JavaScript to construct geometry, manage render loops, and control every pixel of a 3D experience programmatically. Spline represents the first camp. Three.js represents the second.

Comparing them is not straightforward because they solve the same end-user problem (3D content that runs in a browser) from opposite starting points. Spline is a product with a login screen, a subscription, and a GUI. Three.js is a free, open-source library you install from npm and wire into your own code. The overlap is in the output: both can produce a WebGL scene that loads on a webpage, responds to user input, and runs at 60 fps.

This page breaks down what each tool does well, where each falls short, and how to decide which one fits a given project. If you are a designer evaluating whether you need to learn Three.js, or a developer wondering whether Spline could save you time, the comparison below should help.

Spline

What it does

Spline is a browser-based 3D design tool built for creating interactive 3D content that ships directly to websites, apps, and presentations. You open it in Chrome or another modern browser, build scenes on a visual canvas using a toolbar of shapes, materials, lights, and cameras, and then export the result as an embeddable iframe, a React component, or a lightweight runtime file.

The tool handles real-time rendering, physics, scroll-based animations, mouse-tracking interactions, and state machines for complex UI behavior. A built-in collaboration layer lets multiple designers work in the same file simultaneously. Spline also includes AI-powered features for generating 3D objects and textures from text prompts, and it ships with a library of premade assets to speed up prototyping.

Strengths

Spline removes the code barrier entirely. A designer who has never opened a terminal can build a fully interactive 3D landing page hero, product configurator, or animated icon set and publish it in an afternoon. The learning curve is closer to Figma than to a traditional 3D package. Real-time collaboration means teams can iterate together without version-control headaches, and the export options (iframe embed, React component, vanilla JS runtime) integrate cleanly with most frontend stacks.

The interaction system deserves particular mention. Spline lets you define hover states, click events, scroll triggers, and even drag behaviors inside the editor, then exports them as part of the scene. For many common web 3D use cases, this means no custom JavaScript is required at all after export.

Pricing

Spline offers a free tier and four paid plans, all priced per seat with discounts for annual billing.

The free plan gives you limited personal files and web exports with a Spline watermark. The Hobby plan costs $12 per month billed annually ($15 monthly) and removes the watermark, unlocks unlimited files, and includes 2,000 monthly AI credits. The Pro plan, at $25 per month billed annually ($30 monthly), adds unlimited folders, video export, mobile app exports, API and webhook access, and 3,000 AI credits. The Max plan runs $60 per month billed annually ($70 monthly) and bumps AI credits to 10,000 with higher media generation limits. Enterprise pricing is custom and adds SSO, self-hosted exports, version history, and dedicated onboarding.

Each paid tier also offers add-on credit packs for teams that use the AI features heavily.

Limitations

Spline scenes run on its proprietary runtime, which means you are working inside a walled garden. If you need to do something the tool does not support, you cannot drop down to raw WebGL or write a custom shader without leaving Spline entirely. Performance tuning is limited to what the export settings expose. Complex scenes with many polygons or heavy textures can produce larger bundle sizes than a hand-optimized Three.js equivalent.

The free tier's watermark makes it unsuitable for client-facing work, so most professional users will need at least the Hobby plan. And because Spline is a hosted SaaS product, your project files live on their servers. If the company changes direction, raises prices, or shuts down, migration options are limited compared to a codebase you own.

Three.js

What it does

Three.js is a JavaScript library that abstracts WebGL into a higher-level API for rendering 3D scenes in the browser. You create scenes, cameras, lights, and meshes in code, then Three.js translates those objects into the low-level WebGL calls that the GPU executes. It has been in active development since 2010 and is one of the most widely used 3D libraries on the web, powering everything from product configurators and data visualizations to browser-based games and art installations.

The library covers geometry creation, material systems, texture loading, animation, post-processing effects, physics integration, raycasting for mouse interaction, and model loading for formats like glTF, FBX, and OBJ. A large ecosystem of community-built extensions, loaders, and helper libraries (including React Three Fiber for React integration) extends its capabilities further.

Strengths

Three.js gives you complete control. Every vertex, every shader uniform, every render pass is accessible and modifiable. If you need a custom particle system, a procedural terrain generator, or a specific post-processing pipeline, you write it. Performance optimization is granular: you choose when to create and dispose of objects, how to batch draw calls, whether to use instanced rendering, and how to structure your scene graph for maximum efficiency.

Because it is open source and has no runtime dependency on any company's servers, your project is fully portable. The code is yours. The community is enormous, with thousands of examples, tutorials, and Stack Overflow answers covering nearly every use case. React Three Fiber has made Three.js particularly accessible to React developers, providing a declarative component model that maps cleanly to Three.js objects while preserving full access to the imperative API underneath.

Pricing

Three.js is free. It is released under the MIT license, which means you can use it in personal projects, commercial products, and client work without paying anything or displaying any attribution (though attribution is appreciated). There are no tiers, no seat limits, and no feature gates.

Limitations

The learning curve is steep. You need to understand JavaScript well, and you need to learn 3D concepts like coordinate systems, camera projections, lighting models, and material properties through code rather than through a visual interface. Building even a simple interactive scene from scratch takes significantly more time than dragging objects around in Spline.

There is no built-in editor or visual tooling. Everything happens in a text editor and a browser dev console. Designers who do not code cannot use Three.js directly. Collaboration requires the same version-control workflows as any other codebase (Git, pull requests, code review), which adds overhead compared to Spline's real-time multiplayer editing.

Debugging 3D scenes in code can also be tedious. A misplaced camera, an invisible object due to incorrect normals, or a shader that compiles but produces black output can take time to diagnose without visual feedback during authoring.

Comparison table

How to choose

If your team is design-led and the 3D elements are decorative or interactive UI, Spline is the faster path. Product landing pages, animated icons, scroll-triggered 3D sections, and simple product viewers can all be built and shipped without involving a developer. The time savings are significant when the scope fits within what Spline supports.

If your project requires custom rendering, procedural content, or fine-grained performance control, Three.js is the only realistic option. Data visualizations that map thousands of data points to 3D geometry, browser-based games with custom physics, or experiences that need specific post-processing effects all require the low-level access that a code-first library provides.

If you are a developer who works in React, consider React Three Fiber before defaulting to Spline for convenience. R3F provides a declarative API that significantly lowers the boilerplate of Three.js while preserving full control. It can be faster to prototype in R3F than in Spline if you are already comfortable with React, and the result is production code rather than an exported artifact.

If you need both design flexibility and code control, a hybrid workflow sometimes makes sense. Some teams prototype in Spline to explore ideas visually, then rebuild the final version in Three.js for performance and maintainability. Others use Spline for simpler 3D elements on a site and Three.js for the complex interactive pieces. The two are not mutually exclusive.

If budget is a primary constraint, Three.js costs nothing and never will. Spline's free tier works for experimentation but the watermark rules it out for production. For freelancers or small studios, the $12 to $25 monthly cost of Spline is modest, but it scales with team size, while Three.js scales at zero marginal cost.

Related comparisons

• Spline vs Blender

• Spline vs Figma 3D

• Best 3D design tool

Frequently asked questions

Can Spline replace Three.js for web 3D projects?

For many common use cases, yes. If you need a 3D hero section, an interactive product viewer, or animated UI elements on a website, Spline can produce those without any code. But Spline cannot replace Three.js for projects that require custom shaders, procedural geometry, complex physics simulations, or performance optimization beyond what the Spline runtime allows. The two tools have overlapping outputs but different ceilings.

Is Three.js harder to learn than Spline?

Substantially. Three.js requires working knowledge of JavaScript, familiarity with 3D math concepts (vectors, matrices, quaternions), and comfort debugging in a browser console. Spline's interface is visual, with direct manipulation of objects, drag-and-drop interactions, and real-time preview. A designer can be productive in Spline within a few hours. Reaching the same level of productivity in Three.js typically takes weeks of study and practice.

Does Spline use Three.js under the hood?

Spline uses its own proprietary rendering engine. While both Spline and Three.js ultimately run on WebGL (and increasingly WebGPU), Spline does not wrap or depend on Three.js. The runtime that Spline exports to your website is a standalone player, not a Three.js scene.

Can I export a Spline scene and modify it with Three.js?

Not directly. Spline's export formats (iframe embed, React component, vanilla runtime) are self-contained and do not expose a Three.js scene graph. You cannot import a Spline export into a Three.js project and manipulate its objects programmatically. If you need that level of control, you would need to rebuild the scene in Three.js, potentially using exported assets (meshes, textures) as a starting point.

Which produces better performance on the web?

Three.js, in the hands of a skilled developer, will almost always produce a lighter and faster result. You control the polygon count, texture resolution, draw call batching, level-of-detail switching, and every other performance lever. Spline's runtime handles these decisions for you, which is convenient but means you cannot optimize beyond what the tool exposes. For simple scenes the difference is negligible. For complex ones, it can be significant.

Is Three.js still actively maintained in 2026?

Yes. Three.js has been in continuous development since 2010 and receives regular releases. The project has added WebGPU support through its WebGPURenderer, modernized its module system, and expanded its ecosystem. It remains one of the most actively maintained open-source JavaScript libraries, with hundreds of contributors.

Do I need a paid Spline plan for commercial projects?

For most commercial work, yes. The free plan includes a Spline watermark on web exports, which is not appropriate for client projects or production websites. The Hobby plan at $12 per month removes the watermark and is the minimum viable tier for professional use. Teams that need video export, mobile app exports, or API access will need the Pro plan or higher.

Can a designer and a developer collaborate using Spline and Three.js together?

This hybrid approach works well for some teams. A designer builds concepts and prototypes in Spline, and a developer references those to build the production version in Three.js. Alternatively, the designer uses Spline for simpler 3D elements on the site while the developer handles the complex interactive pieces in Three.js. The key is clear ownership of which parts are Spline exports and which are custom code.

What about React Three Fiber as a middle ground?

React Three Fiber (R3F) is a React renderer for Three.js that makes 3D development feel more like building React components. It lowers the boilerplate of raw Three.js significantly. For React developers, R3F can feel closer to Spline's ease of use while maintaining full programmatic control. It is not a visual tool, though. You still write code, and you still need to understand 3D concepts.

Which should I learn first if I am new to web 3D?

Start with Spline if you are a designer or if you want to ship 3D web content quickly without a programming background. Start with Three.js if you are a developer who wants deep understanding of how 3D rendering works in the browser. Learning Spline first gives you faster results and builds intuition for 3D concepts (lighting, materials, camera angles) that transfer to Three.js later. Learning Three.js first gives you foundational knowledge that makes every other 3D tool easier to understand.

How do Spline and Three.js handle animations differently?

Spline provides a visual timeline and state machine for defining animations. You set keyframes by moving objects on the canvas, define transitions between states, and preview everything in real time. Three.js handles animation programmatically: you write code to interpolate values over time, use the built-in AnimationMixer for skeletal and keyframe animations loaded from 3D files, or use external libraries like GSAP or Tween.js. Spline's approach is faster for simple animations. Three.js is more flexible for complex, data-driven, or procedural motion.

Can Three.js scenes be made accessible?

Accessibility in 3D web content is challenging regardless of the tool. Three.js renders to a canvas element, which is opaque to screen readers by default. Developers can add ARIA labels, provide alternative text descriptions, and ensure keyboard navigation works alongside the 3D view. Spline's exports face the same canvas accessibility limitations. In both cases, thoughtful fallback content and semantic HTML around the 3D embed are necessary to meet accessibility standards.