Gracia Brings Its Streamable 4DGS Volumetric Videos to Apple Vision Pro

Gracia’s moving volumetric captures have landed on Apple Vision Pro. “Gracia: 4DGS viewer,” now free on the App Store, streams 4D Gaussian Splatting scenes that you can walk around and watch from any angle, placed in your own room through passthrough or stepped into fully. The app requires visionOS 26.4 or later, runs on any Vision Pro with an M2 chip or newer, and ships with over 25 photorealistic captures, with more promised.

Gracia already streams these scenes over WebXR, the company shipped that as a world-first in March, letting a Quest 3 browser pull a volumetric performer into the room with no app or download. Apple still doesn’t allow WebXR pages to use camera passthrough as a background, so web streamed captures on Vision Pro appear floating in a featureless black void. The dedicated app gets around that, restoring the in your living room mixed reality presentation that is the whole point, or letting you step fully inside a scene.

It extends a platform run from the company’s macOS app through the addition of user file sharing, which followed its move out of open beta.

The underlying content is 4DGS. Gaussian splats with time as the fourth dimension, so the splats move. Streaming them without a multi gigabyte download was the hard problem, and Gracia’s answer is to send keyframes plus motion change deltas, a video-codec-style scheme that transmits only what changes between frames, rendered in the browser via WebGPU. High quality runs about 120,000 splats per frame and wants a constant 75 Mbps connection. A lighter 17 Mbps mode drops to roughly 15,000 splats per frame. Because there is no hard file size cap, longer pieces become viable.

So the Vision Pro app is a viewing endpoint for professionally produced volumetric video, not a capture tool. Even so, it is the most accessible way yet to watch genuine 6DoF volumetric performances on Apple’s headset, and another step toward Gracia’s stated ambition of becoming the “YouTube of volumetric content.”

Try it on the App Store, with more web scenes at gracia.ai/store.