When a product team decides to add an interactive 3D feature to a web app, the framework decision is usually the first one made — and the one most often made for the wrong reasons.
Most teams pick Three.js. Some pick Babylon.js. A few pick PlayCanvas. The choice gets made because somebody on the team has heard of one of them, or because a senior engineer has a strong preference from a project they shipped four years ago.
That's not how a senior independent specialist would scope this decision. The framework choice should follow from the kind of feature being built, the constraints the product is operating under, and the team that will own the code after launch. The three frameworks don't compete with each other on every project — they compete on specific axes, and most projects favor one of them clearly once you ask the right questions.
Here's how I think about that decision.
The three frameworks, at a glance
Short answer: Three.js is the right default for most product feature work. Babylon.js wins where a real-time game engine matters. PlayCanvas wins where collaborative editing and a hosted toolchain matter more than code-level control.
That summary will already feel reductive to engineers who know these libraries well. It's meant to be — most decisions get made on this level of granularity, and if the rest of this article only sharpens the reader's intuition about which of those three sentences applies to their project, it's done its job.
The three frameworks share a common foundation: they all wrap WebGL (and increasingly WebGPU) into a developer-facing API for building 3D scenes that run in a browser. They all have mature ecosystems, active maintenance, and successful production deployments behind them. Where they differ is what kind of project they make easy and what they make hard.
What Three.js is actually good at
Three.js is the most popular WebGL framework on the open web by a wide margin. Most of the impressive 3D websites people send each other on Twitter are built on Three.js. The library is small, the community is enormous, and the code patterns have become close to standardized across the industry.
For a marketing site, a product configurator, a scrollytelling experience, or an interactive 3D embed inside an existing web app — Three.js is the default and almost always the right call. Specifically:
- Bundle size can be controlled tightly when paired with a tree-shaking bundler. A focused configurator can ship in well under one megabyte of JavaScript.
- Integration with React, Vue, Svelte, Webflow, and WordPress is straightforward. The library doesn't try to own the page — it expects to be a citizen of the existing app.
- Hiring and handover are easy. Three.js syntax is widely known. A team taking over the code in two years won't need a specialist to maintain it.
- The ecosystem of helpers — drei, postprocessing, GLTFLoader, KTX2 transcoder — covers most of what a feature project needs without writing custom infrastructure.
The places Three.js gets uncomfortable: complex physics, multiplayer state, animation timeline editing, and any kind of "game-like" loop with hundreds of dynamic entities. The library doesn't include those things — you bolt them on with separate packages, and the assembly cost adds up.
When the project is a feature inside a larger product — not a game, not an experience that needs an editor — Three.js is almost always the most efficient choice.
What Babylon.js is actually good at
Babylon.js is a real-time 3D engine first and a web library second. The team behind it (originally at Microsoft, now broadly maintained) treats it as a peer of Unity and Unreal in scope and ambition — a full game engine that happens to ship in the browser.
That framing matters because Babylon's strengths show up in projects that look more like games than features. Specifically:
- Built-in physics via Havok integration — the kind of physics that handles falling boxes, vehicle dynamics, and ragdoll behavior without third-party add-ons.
- Animation system that includes a proper timeline, blending, and inverse kinematics. Useful for any project where characters move.
- Multiplayer-ready architecture with networking patterns built in.
- A first-class scene editor (Babylon Editor and the Inspector) that lets non-engineers contribute to scenes.
- WebXR support that's noticeably more mature than the equivalent on Three.js as of late 2025.
The cost: bigger bundle by default, less flexibility on integration patterns, smaller pool of mid-level developers familiar with it. A team taking over a Babylon.js codebase will more often need to hire someone who knows the engine specifically, where Three.js code can be picked up by any senior front-end developer with enough time to read documentation.
I've used Babylon on training simulator development projects and physics-driven product configurators where the simulator behavior was the product, not just a marketing flourish on top of it. For those, Babylon was clearly the right tool. For a product configurator where the goal is to show a watch in good lighting and let the customer change colors, it would have been over-engineered.
What PlayCanvas is actually good at
PlayCanvas is the outlier. It's a full game engine like Babylon, but it ships with a hosted browser-based editor — closer in workflow to Unity than to a JavaScript library. The PlayCanvas team has built their tooling around the assumption that a 3D project involves designers, technical artists, and engineers collaborating, and that pure code-first workflows don't scale to teams of more than two or three people.
This makes PlayCanvas the strongest choice in a specific kind of organization:
- Studios with a designer-first pipeline — where a 3D designer needs to lay out scenes, lighting, and entity behavior visually rather than through code.
- Teams that need to ship advergames or interactive campaigns at speed — the hosted editor and asset pipeline cut weeks off the production cycle.
- Mobile-heavy delivery — PlayCanvas is unusually well-tuned for mobile WebGL performance and small bundle delivery, in part because so many of its users have shipped advergames where mobile performance is the entire game.
- WebXR and AR product viewers — the editor's commerce templates accelerate the most common product configurator development patterns.
The trade-off: PlayCanvas is its own ecosystem. You commit to their editor, their hosting workflow, their asset format. For a brand or studio building several projects in succession, that commitment compounds into productivity. For a one-off feature inside a larger product, it tends to feel like overhead.
The framework decision often hides the real decision: are you building a feature, or are you building an experience your team will iterate on for years?
How I actually decide on a project
Most clients don't come to this decision looking for a framework recommendation. They come asking can you build this thing. The framework choice is something I scope during the first or second conversation, and I do it by asking three questions in order:
1. Who maintains this in two years? If the answer is "the existing front-end team," the framework needs to be one they can credibly own. That usually narrows the field to Three.js for any team with no prior 3D background, since the syntax and patterns are closest to general front-end JavaScript.
2. What's the dominant interaction pattern? A static product viewed from arbitrary angles is a different problem from a guided product flyover, which is a different problem from a real-time simulation with physics. Three.js handles the first two beautifully and gets harder at the third. Babylon handles all three but at higher initial complexity. PlayCanvas trades initial complexity for editor-driven productivity once a team is fluent in it.
3. What's the asset volume, and who's producing the assets? A configurator with twenty product variants and a few materials is small enough that any framework handles it. A scene with hundreds of distinct entities, multiple animations, and active artist iteration is where editor-based workflows (PlayCanvas, Babylon Editor, sometimes Three.js paired with a Blender export pipeline) start to matter.
There's a fourth question I sometimes ask, more diplomatically than this: does anyone on the team have strong prior experience with one of these frameworks? Familiarity is worth a lot. A team that's already comfortable with Babylon should usually keep using Babylon, even if Three.js would have been my recommendation for a green-field decision.
What I'd push back on, gently
Three patterns I see often that I'd flag in a scoping conversation:
Picking the framework before scoping the asset pipeline. The framework decision is usually less consequential than how the team plans to compress textures, optimize geometry, and deliver assets to the browser. A Three.js project with a sloppy asset pipeline ships slower than a PlayCanvas project with a disciplined one. Whatever the framework, the asset pipeline gets the most attention in the first two weeks of a serious project.
Picking Unity WebGL as a reflex. Unity WebGL builds for browsers exist and work — but they typically ship at a baseline of 15–25 megabytes for the engine alone, before any project content. For most marketing and product-page use cases, that's a non-starter on mobile. Unity makes sense for browser-based projects where the team is already a Unity team and the project is genuinely game-shaped. For a product configurator, it almost never does.
Treating WebGPU as a near-term decision. WebGPU is real, it's exciting, and it's worth knowing about. But for a feature shipping in the next six to twelve months on a public-facing product page, WebGL still has dramatically better mobile coverage and lower risk. Three.js, Babylon, and PlayCanvas all have WebGPU paths — but I'd ship the project on WebGL today and migrate the renderer when browser support reaches a comfortable majority of the audience.
The honest summary
Three.js is the right answer for most projects. Babylon is the right answer when the project is more game than feature. PlayCanvas is the right answer when the project has more designers than engineers contributing to scenes. Unity WebGL is rarely the right answer for browser-first delivery.
That summary will fit most decisions. The interesting cases are the ones that don't — and those are usually worth talking through with someone who's shipped the wrong framework choice once or twice and learned from it.
If you're scoping a 3D feature right now and aren't sure where it falls, that conversation is the kind I'm happy to have on a discovery call. The framework choice gets made in the first thirty minutes if the questions above are clear. The rest of the call is about the actual project.