Three.js vs. Spline: How to Choose the Right Technology for a 3D Website (2026)

Once you decide to build a 3D website, the first question shouldn’t be “how much will it cost?” but “which technology will we use?” Because that choice determines the cost, the loading speed, how easy the site is to update, and the SEO outcome. You can achieve the same visual effect in five different ways, and the budgets for those five routes can differ by a factor of ten.

Start with the right question: will the user be in control?

One question decides the technology: will visitors control the scene, or just watch it?

If users will rotate the product, change its color, open up a cross-section or select dimensions, you need a real-time 3D engine. If users will only see a nice motion effect as they scroll, using real 3D is spending money in the wrong place. Projects that don’t make this distinction from the start end up heavier and more expensive than they need to be.

Option 1 — Three.js (and React Three Fiber)

A JavaScript library built on WebGL and the industry’s de facto standard. In React-based projects, it is used via React Three Fiber.

When it’s the right choice: product configurators, 360-degree product views, machine cross-sections, architectural walkthroughs, swapping materials and colors. In short, any scenario where users interact with the product.

Strengths: no limits. You can build any scene you want, it supports every model format, and the community and documentation are huge. It’s long-lived and portable; it will still be maintainable five years from now.

Weaknesses: it’s genuine software development. Scene setup, lighting, camera, performance budget and mobile fallback scenarios all have to be written by hand. It isn’t cheap, and in inexperienced hands it turns into a performance disaster.

Option 2 — Spline and other ready-made 3D scene tools

Tools that let you build a 3D scene in the browser through a visual interface and embed it on your site.

When it’s the right choice: when the budget is limited, the scene is simple, the interaction is superficial and the project needs to go live fast. For a rotating abstract object in a hero section, it’s more than enough.

Strengths: speed. Hours instead of days. Designers can update the scene without needing a developer.

Weaknesses: file sizes turn out larger than you expect, the scene becomes dependent on a third-party service, and when that service changes its pricing or shuts down, your site is affected. It hits a wall with complex interactions. For a corporate brand, handing your infrastructure over to an outside provider is a strategic risk.

Option 3 — CSS 3D transforms

Perspective and depth with pure CSS, no library required. GPU-accelerated, and it doesn’t even add up to a kilobyte.

When it’s the right choice: card flips, layered parallax, subtle depth, menu and transition animations. This is actually what the vast majority of corporate websites need.

Our honest advice: for roughly half of the brands that say “we want a 3D website,” what they’re really looking for isn’t technically WebGL but well-crafted CSS depth and motion design. Putting the budget difference into product photography or advertising pays off more.

Option 4 — Lottie and SVG animation

Vector-based animation. It comes out of a design tool, plays in the browser, and file sizes are measured in kilobytes.

When it’s the right choice: process explanations, step-by-step diagrams, icon animations, data visualization. Because the text stays in the DOM, search engines can read it; it’s the safest form of animation from an SEO perspective.

Option 5 — Scroll-driven video frames

A 360-degree shoot of the product is captured frame by frame and played back as the user scrolls. It delivers a similar effect without the cost of 3D modeling.

When it’s the right choice: brands with a physical product but no CAD or 3D model. It works very well for furniture, textiles, food packaging, automotive accessories and similar categories.

Watch out: if the number of frames and the resolution aren’t budgeted, the total download size can end up heavier than real 3D. The frame sequence must be compressed, and a lower-resolution version should be served on mobile.

Comparison summary

• Do you need real interaction? If yes, Three.js or React Three Fiber. If not, keep reading.
• Tight budget, simple scene? Spline-type tools, but with eyes open to the dependency risk.
• Just depth and motion? CSS 3D. The fastest, cheapest and most robust option.
• Explaining a process? Lottie or SVG.
• Physical product, but no 3D model? A scroll-driven frame sequence.

Rules that apply whatever you choose

Whichever technology you choose, the following are non-negotiable. A 3D website that ignores them may look great but will lose money commercially:

• The first screen doesn’t wait for 3D. Text and layout come first; the scene kicks in afterward.
• Nothing renders before it enters the viewport. A scene further down the page doesn’t use the GPU until the user gets there.
• A poster frame is mandatory. A static image holds the scene’s place until it loads; the layout doesn’t shift and the LCP metric is protected.
• It switches off on weak devices. 3D that runs badly is worse than no 3D at all.
• No meaningful text stays inside the canvas. Google doesn’t read what’s inside a canvas.
• The “reduce motion” preference is respected. It’s essential for accessibility.

We explain in detail why these rules are so critical and how each one is implemented in our guide to 3D animated corporate websites. We cover the speed side separately in our article on Core Web Vitals for 3D websites.

What determines the cost?

Let’s be clear. These are the items that determine the cost:

• CSS 3D and motion design: handled within the corporate website project, without a separate line item.
• Lottie animation set: low cost per scene; design time is the deciding factor.
• Scroll-driven frame sequence: shooting and studio costs plus integration. Calculated per product.
• Three.js product configurator: the most expensive item. Model preparation, material setup, interaction logic and performance optimization are each separate pieces of work.

For current package details, see our pricing page, or tell us about your project via our contact page. You can find what we focus on for corporate websites on our web design service page.

Frequently asked questions

Does a 3D website hurt Google rankings?

If it’s built wrong, yes. If the scene initializes on first load, there’s no poster frame and the text sits inside the canvas, both speed metrics and crawlability suffer. When it’s built correctly, meaning the scene is deferred, the text is in the DOM and the poster frame is in place, a 3D website ranks no differently from a static one.

Is it a problem to use a ready-made tool instead of Three.js?

Not for small, simple scenes. But as the scene grows, file size and third-party dependency become serious problems. A corporate brand’s homepage shouldn’t depend on another company’s service.

Can 3D be added to my existing website?

In most cases, yes. The site’s current infrastructure, theme structure and performance are reviewed; the 3D layer is added as a separate module. But if the site’s basic speed is already poor, that has to be fixed first.

Does a 3D scene work on mobile too?

If it’s built correctly, yes. Our standard: on mobile, polygon count and texture resolution are reduced, the frame rate is capped, and on very low-powered devices the scene isn’t initialized at all and a static image stays in place.

How long does delivery take?

CSS- and Lottie-based solutions don’t extend the corporate website timeline. A Three.js-based configurator requires its own project timeline, including model preparation, and varies with product complexity.