Hey LiveKit community 
Sharing what we’ve been building — livekit-plugins-spatius, currently up at PR #5821.
Quick context: we’re Spatius, a real-time avatar layer for voice agents. Since opening early access a few weeks ago we’ve had 50+ developer signups, and about 70% of them are building on LiveKit Agents. That ratio is what pushed us to write the plugin — the easier we make this for LiveKit devs, the more it helps both sides.
What the plugin does
Lets a LiveKit Agent drive a photoreal, 3DGS-rendered avatar in a room. Audio in (the agent’s audio track) → real-time lip-sync + microexpressions, ~<300ms rendering latency, ~<1s end-to-end with low-latency TTS. Drops into an existing agent workflow without rewriting your pipeline.
Why we think it fits LiveKit’s bandwidth-first ethos
Cloud-rendered avatars are usually the cost bottleneck — running full render in the cloud and streaming 1–5 Mbps of pixels per session adds up fast once you scale past demos. We took a different cut: lightweight audio feature extraction in the cloud, native Gaussian Splatting rendering on the edge (Web / iOS / Android / embedded).
What that gets you:
- ~10–20 KB/s wire bandwidth — friendly to flaky / mobile networks
- 1080p 25fps on entry-level SoCs — we have had clients deploying our avatars on G88, RK3576, etc. with stable performance
- ~$0.007 / min rendering cost (~$1 per 142 min) — economics that scale past a demo
- Long-session visual stability — the avatar doesn’t drift across extended interactions, which matters for AI tutors, interviewers, customer service agents
Architecturally the plugin extends BaseAvatarSession and follows the standard architecture of adding an avatar to livekit agents — we don’t reinvent transport.
Demo
Live playground: Spatius — pick any character, start chatting. These calls route through LiveKit rooms!
PR Request
PR: feat: Spatius avatar plugin by 3DRX · Pull Request #5821 · livekit/agents · GitHub
About 70% of our early users are building on LiveKit Agents, so shipping this cleanly really matters to us. Happy to iterate on whatever feedback comes back 
— Jingyang @ Spatius