If you’re a developer considering building for spatial computing in 2026, the tooling landscape is both better and more fragmented than it was a year ago. There are more options, better documentation, and stronger performance—but choosing the right stack still requires understanding the tradeoffs.

I’ve spent the last few months building small projects across the major platforms, and here’s where things stand.

Unity: Still the Default, With Asterisks

Unity remains the most common choice for XR development, and for good reason. The ecosystem is massive, the asset store is deep, and virtually every headset manufacturer provides a Unity SDK. If you need to ship on Quest, Pico, PSVR2, and desktop VR simultaneously, Unity is the practical choice.

The Unity XR Interaction Toolkit has matured substantially. Hand tracking, controller input, teleportation, and grab interactions come out of the box with reasonable defaults. You can get a functional VR prototype running in a day or two if you know Unity basics.

The asterisks: Unity’s pricing model continues to frustrate indie developers. The runtime fee debacle of 2023 left lasting trust damage, and while they’ve walked back the worst of it, the uncertainty around future pricing changes makes some developers hesitant to build their business on Unity long-term.

Performance on standalone headsets (Quest 3 particularly) requires careful optimisation. Unity’s rendering pipeline isn’t designed for mobile GPUs, and getting a visually compelling scene to run at 72fps on a Quest involves a lot of draw call batching, texture atlasing, and shader optimisation that the engine doesn’t handle automatically.

Unreal Engine: Beautiful but Heavy

Unreal Engine 5 produces the best-looking XR content, full stop. Lumen global illumination and Nanite virtualised geometry are extraordinary technologies. For architectural visualisation, automotive design review, and high-end training simulations, Unreal is the quality benchmark.

The problem is that UE5’s performance demands are steep. Running a Nanite-heavy scene in VR at 90fps requires serious hardware—we’re talking RTX 4070 or better. On standalone headsets, you’re working with a drastically stripped-down version of the engine’s capabilities. Epic has improved their mobile VR pipeline, but it’s still a significant step down from what Unreal can do tethered.

The development experience is also heavier. Unreal’s learning curve is steeper than Unity’s, project compile times are longer, and the C++ workflow isn’t everyone’s preference. Blueprint visual scripting helps for rapid prototyping but adds its own complexity at scale.

For enterprise projects with dedicated hardware and development budgets, Unreal is often the right call. For indie VR games or apps targeting standalone headsets, Unity or lighter-weight options usually make more sense.

visionOS: Apple’s Walled Garden

Apple’s development tools for Vision Pro are excellent within their scope. SwiftUI for spatial computing, RealityKit for 3D rendering, and ARKit for world understanding form a coherent stack that’s well-documented and tightly integrated with Xcode.

If you’re already an iOS developer, the transition to visionOS is surprisingly smooth. The mental model is “SwiftUI but with depth”—you’re placing views in 3D space rather than on a flat screen. Apple’s design guidelines are opinionated but consistent, and the resulting apps feel polished.

The limitation is obvious: you’re building for one headset. The Vision Pro installed base is small, and while Apple will presumably release more affordable hardware eventually, the current market is limited. Building exclusively for visionOS is a bet on Apple’s spatial computing future.

That said, companies exploring AI-enhanced spatial computing workflows are finding visionOS interesting to work with. One AI consultancy we talked to noted that the structured, well-documented nature of Apple’s frameworks makes it easier to integrate machine learning models into spatial applications compared to the more fragmented Android XR ecosystem.

WebXR: The Underdog With Potential

WebXR doesn’t get enough attention. Building XR experiences that run in a browser—no app store, no installation, works across headsets—is a compelling proposition. Share a URL, put on a headset, and you’re there.

Three.js with the WebXR API is the most common approach for custom WebXR development. A-Frame provides a higher-level abstraction. Babylon.js offers a middle ground with good XR support and a visual editor.

The practical reality is that WebXR performance sits well below native applications. Browser overhead, JavaScript execution speed, and limited access to hardware features (eye tracking, hand tracking quality, spatial audio) mean you’re making tradeoffs. For product configurators, virtual showrooms, educational content, and lightweight social experiences, WebXR works well. For anything performance-intensive, it’s not there yet.

The progressive enhancement model is interesting though. Build a 3D experience that works on a flat screen, then add VR mode for users who have a headset. Your audience isn’t limited to headset owners, and VR becomes an enhancement rather than a requirement.

Meta’s Horizon OS and Android XR

Meta’s push to make Quest a platform with Horizon OS is creating new development opportunities. The Meta Spatial SDK provides Android-based development for mixed reality apps that integrate with the Quest home environment.

Google’s Android XR initiative, announced for Samsung’s upcoming headset, adds another Android-based target. In theory, these share enough DNA that targeting both should be manageable. In practice, the SDKs are different enough that “build once, run everywhere” isn’t realistic yet.

Choosing a Stack

For most developers in 2026, the decision tree looks roughly like this:

Targeting Quest with the broadest reach? Unity with the XR Interaction Toolkit. It’s not the most exciting answer, but it’s the most practical.

Building for enterprise with controlled hardware? Unreal Engine 5 if visual quality matters, Unity if cross-platform flexibility matters more.

Apple ecosystem developer with a Vision Pro focus? visionOS native with SwiftUI and RealityKit.

Maximum accessibility, minimum friction? WebXR with Three.js or A-Frame.

The spatial computing tools available today would have been remarkable five years ago. The fragmentation is frustrating, but the individual platforms are each strong enough to build genuinely useful things. Pick based on your audience, not on which technology sounds most impressive.