Both platforms power real-time interactive AI avatars, but they take very different approaches to where rendering happens and what that means for cost, bandwidth, and deployment flexibility. Here’s the honest breakdown.
Quick verdict
Teams building production-scale conversational AI avatar products on mobile, web, or embedded hardware where bandwidth constraints are real, unit economics matter, and native SDK support is required from day one.
Developers who want a managed, cloud-hosted avatar pipeline and are comfortable with cloud-dependent infrastructure plus a per-minute credit model. LiveAvatar fits best when you're already aligned with a web-first deployment model.
What are Spatius and LiveAvatar?
Spatius - On-Device Edge Rendering for Real-Time Avatars
Spatius is a real-time AI avatar platform built around on-device edge rendering. Instead of streaming compressed video from the cloud, Spatius runs the avatar rendering process locally on the user's device. That keeps bandwidth at 10-20 KB/s, supports offline-tolerant deployments, and delivers 1.2-1.5s end-to-end latency from user utterance to avatar response. Native SDKs cover Web, iOS, and Android, reaching 99% of devices.
- → Starting price: Free - $0/mo (~50 min/mo)
- → End-to-end latency: 1.2-1.5s (full pipeline: STT -> LLM -> TTS -> avatar)
- → SDK coverage: Web, iOS & Android native SDKs
- → Device reach: 99% of Android, iOS, and Web devices
- → Time to first session: Under 30 minutes with the quickstart guide
LiveAvatar - HeyGen's Cloud-Hosted Realtime Avatar API
LiveAvatar is HeyGen's real-time avatar API for conversational AI agents. It streams avatar video from the cloud via WebRTC and LiveKit. Developers can choose Full mode, where HeyGen hosts the full ASR, LLM, TTS, and avatar stack, or Lite mode, where you bring your own ASR, LLM, and TTS while HeyGen handles the avatar stream. The platform is cloud-managed and web-first.
- → Pricing (Full mode): ~$0.20/min at Scale plan rates
- → Pricing (Lite mode): ~$0.10/min at Scale plan rates
- → Starting plan: $19/mo (150 credits; ~75 min Full mode or ~150 min Lite mode)
- → Rendering: Cloud video streaming via WebRTC / LiveKit
- → Bring your own LLM: Supported in Lite mode
Feature comparison
Side-by-side breakdown of key capabilities. Last updated May 2026.
| Feature | Spatius | LiveAvatar |
|---|---|---|
| Core Technology | ||
| Rendering approach | On-device edge rendering | Cloud video streaming (WebRTC / LiveKit) |
| Bandwidth required | 10-20 KB/s | High-bandwidth cloud video stream |
| End-to-end latency | 1.2-1.5s¹ | Not publicly verified end-to-end² |
| Works on low bandwidth | Yes | No |
| Cost per minute | $0.007/min (Scale) · $0.009/min (Starter) | $0.20/min Full · $0.10/min Lite |
| Free tier | ~50 min/mo | No free API credits |
| Starting paid plan | $19/mo | $19/mo |
| Platform & SDKs | ||
| Web SDK | Yes | Yes |
| iOS SDK | Native | Not publicly referenced³ |
| Android SDK | Native | Not publicly referenced³ |
| Device coverage | 99% of Android, iOS, and Web devices | Web / browser-first deployment |
| Integration | ||
| Bring your own LLM | Yes | Yes (Lite mode) |
| LiveKit / WebRTC support | Yes | Yes |
| Hardware / embedded suitability | Yes | Cloud-dependent |
| Offline-tolerant deployment | Yes | No |
| Deployment | ||
| Concurrent sessions (Scale plan) | 40 | Not clearly disclosed |
| Max session length (Scale) | Unlimited | Varies by plan |
| Enterprise / isolated deployment | Yes | Cloud only |
¹ Spatius end-to-end latency (1.2-1.5s) measures the full round-trip pipeline: user finishes speaking -> STT -> LLM -> TTS -> avatar begins responding.
² LiveAvatar has not published a verified end-to-end latency benchmark covering the full STT -> LLM -> TTS -> avatar pipeline in official docs as of April 2026. Public materials describe the transport layer, but not the comparable full-pipeline figure.
³ HeyGen publishes a Web SDK for LiveAvatar. Dedicated native iOS and Android SDKs are not referenced in public documentation as of April 2026.
Where Spatius pulls ahead
Four areas where Spatius offers a fundamentally different, and better, experience.
~95% Lower Cost Per Minute
Spatius Starter costs $0.009/min. LiveAvatar Full mode costs approximately $0.20/min, which is the closest apples-to-apples comparison when both platforms are responsible for the complete STT + LLM + TTS + avatar stack. That's roughly 95% lower cost per minute. Even against LiveAvatar Lite mode at $0.10/min, Spatius is still dramatically cheaper while including the full pipeline.
Works Anywhere, Not Just on Fast Networks
LiveAvatar streams compressed video from the cloud. That works well on stable office Wi-Fi, but it creates a hard dependency on reliable, high-bandwidth connectivity. Spatius renders locally on the user device, so bandwidth stays at 10-20 KB/s, closer to a voice call than a video stream.
Built for Hardware and Embedded Use Cases
On-device rendering isn't just a cost optimization. It unlocks deployment environments that cloud-streaming platforms structurally struggle with: kiosks, reception robots, retail fixtures, in-vehicle systems, and other always-on physical installations.
Predictable Cost at Production Scale
LiveAvatar meters cost through credits and overage pricing. At production volumes, that makes monthly spend harder to forecast. Spatius Scale includes ~40,000 min/mo at $0.007/min, 40 concurrent sessions, and no per-session limits, so per-minute economics stay predictable as usage grows.
Pricing at a glance
Spatius
- Free - $0/mo
- ~50 min/mo · 2 concurrent sessions · Web, iOS & Android SDKs
- Starter - $19/mo
- ~2,200 min/mo · $0.009/min · 5 concurrent sessions
- Scale - $299/mo
- ~40,000 min/mo · $0.007/min · 40 concurrent sessions · No session limits
- Enterprise - Custom
- Unlimited usage · Isolated deployment · Dedicated integration support
LiveAvatar
- Starter - $19/mo
- 150 credits · ~75 min Full mode or ~150 min Lite mode
- Full mode
- ~$0.20/min at Scale plan rates
- Lite mode
- ~$0.10/min at Scale plan rates
- Enterprise - Custom
- Custom volume pricing
Note: HeyGen no longer offers free API credits according to the source material used for this comparison.
Frequently asked questions
Is Spatius a good alternative to LiveAvatar? +
Yes, especially if your priorities are cost efficiency, mobile-native deployment, low-bandwidth environments, or hardware and embedded use cases. If you're already committed to a cloud-hosted, browser-first deployment model, LiveAvatar can still be a reasonable fit.
How much more affordable is Spatius than LiveAvatar? +
On a per-minute basis, Spatius Starter at $0.009/min is roughly 95% lower than LiveAvatar Full mode at $0.20/min. Even compared with LiveAvatar Lite mode at $0.10/min, Spatius remains materially cheaper while still including the full pipeline.
Does Spatius have iOS and Android SDKs? +
Yes. Spatius ships native SDKs for Web, iOS, and Android on every plan, including the free tier. LiveAvatar publicly references a Web SDK, but native iOS and Android SDKs are not cited in its public docs as of April 2026.
How does Spatius achieve such low costs? +
The difference comes from rendering architecture. LiveAvatar streams avatar video from the cloud, which means cloud GPU compute, encoding, and bandwidth egress costs are incurred every session minute. Spatius renders the avatar locally on the user's device, dramatically reducing server-side cost.
How does Spatius latency compare to LiveAvatar? +
Spatius publishes a verified 1.2-1.5s end-to-end latency figure measured across the complete pipeline from user speech completion to avatar response. LiveAvatar has not published an equivalent verified end-to-end benchmark in its official documentation as of April 2026. That means direct apples-to-apples comparison is not currently available from public sources.
Can I use my own LLM with Spatius? +
Yes. Spatius supports BYO LLM across plans via LiveKit, WebSocket, and RTC integration paths. LiveAvatar also supports BYO LLM, but in Lite mode rather than the fully managed Full mode.
How long does it take to get started with Spatius? +
Most developers can get their first working session running in under 30 minutes with the quickstart guide. The free tier includes about 50 minutes per month, so teams can prototype before committing to paid usage.
Other alternatives
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- Spatius vs Tavus (2026)
- Spatius vs Synthesia (2026)
- Spatius vs D-ID (2026)
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