RealityKit, Jetpack XR SceneCore, and Looking Glass WebXR define the main spatial stacks in 2026. Build portable holographic UI patterns. Read now.
Three Spatial Stacks, One Design Problem
RealityKit, Jetpack XR SceneCore, and Looking Glass WebXR are the main spatial stacks you plan against when shipping holographic UI in 2026. Each owns a different runtime surface: native Apple spatial scenes, Android XR composition, and browser-delivered light-field or volumetric display. The product goal is the same on all three—readable hierarchy, stable placement in space, and input that does not fight the user’s body—so the useful work is not copying platform demos. It is extracting patterns that stay portable when the SDK changes.
Treat each stack as a renderer and input adapter, not as your app’s source of truth. Own your interaction model, layout rules, and content graph in a platform-neutral layer. Map that layer onto RealityKit entities, SceneCore nodes, or WebXR sessions only at the edges. That boundary is where most teams either gain reuse or lock themselves into one vendor’s scene graph.
Portable Holographic UI Patterns
Start with a small set of primitives that every holographic surface needs: a world-anchored panel, a body-relative tray, a gaze-or-point focus ring, and a confirm gesture that is distinct from hover. Define size, distance, and contrast rules in physical units first, then convert to each SDK’s coordinate system. Panels that sit too close clip; panels that sit too far become unreadable under room light. Prefer depth layers over nested floating cards—depth should encode priority, not decoration.
- Anchor primary tasks in world space; keep secondary controls body-relative so they travel with the user.
- Use progressive disclosure: one focal surface at a time, with related actions as satellites rather than a full 2D chrome dump.
- Separate hover, select, and commit so accidental dwell does not trigger destructive actions.
- Design offline or degraded modes for when tracking jitter, occlusion, or display limits reduce fidelity.
State belongs in your domain model. The spatial scene is a projection of that state. When RealityKit, SceneCore, and Looking Glass WebXR each render the same task flow, differences should appear only in materials, hit-testing, and session lifecycle—not in business rules or copy hierarchy.
SDK Boundaries and Integration Tradeoffs
RealityKit favors entity-component scenes and tight system integration on its host platform. Jetpack XR SceneCore centers Android-style composition and lifecycle that fits existing app modules. Looking Glass WebXR prioritizes distribution through the open web and display pipelines that do not require a native install. Choose by where users already are, then isolate SDK calls behind thin adapters: create surface, attach content, set pose, bind input, tear down session.
Avoid leaking SDK types into feature code. Feature modules should request “show a 40cm panel at arm’s length with three actions,” not construct raw platform entities. That keeps automated tests honest and lets you swap or dual-target stacks without rewriting product logic. Shared assets—icons, type scale, motion curves—should live outside any one scene graph so branding stays consistent when the renderer changes.
Shipping Guidance That Survives Platform Drift
Instrument spatial sessions the same way you instrument mobile screens: entry, dwell, successful commit, and abandon. Watch for panels that never receive a commit, anchors that users constantly re-place, and gestures with high cancel rates—those signal layout or input design problems, not “XR novelty.” Validate with real rooms and real lighting; holographic UI that works only in a dark demo space fails in offices and workshops.
Ship iteratively: one critical path fully spatial, fallback 2D where tracking or display quality is poor, then expand. Keep documentation of your portable patterns next to the adapters so new surfaces reuse the same panel, focus, and confirm contracts. In 2026 the stacks will keep diverging at the API surface; teams that win are the ones whose holographic interface patterns stay stable above RealityKit, Jetpack XR SceneCore, and Looking Glass WebXR.