Polybuzz is a product of Zuoyebang, a Chinese education company — rebranded from PolySpeak and Poly.AI before arriving at its current name. The platform relies entirely on third-party AI models, does not disclose whether your conversations are used to train those models, and gates most meaningful features behind an aggressive paywall. Free users face prominent ads, memory that resets after roughly six messages, and voice features locked behind credits that run out quickly. Chai AI is built on an entirely different foundation. Chai Research is a US-based Social AI company that builds and operates its own cluster of over 5,000 GPUs, trains more than 51,000 in-house models, and shares your data with no third parties — ever.
Polybuzz is a Chinese consumer app with ads, a short memory, and no proprietary AI. Chai AI is a US-built platform with its own models, no ads, and full data transparency.
| Feature | Chai AI | Polybuzz |
|---|---|---|
| Company type | Social AI company | Consumer app (owned by Zuoyebang, China) |
| Based in | United States | China |
| Data sharing | No third-party data sharing | Not disclosed |
| AI infrastructure | Own 5,000+ GPU cluster | Third-party models |
| Ads | None (ad-free) | Yes — free tier heavily ad-supported |
| Memory | Conversation-persistent | Resets after ~6 messages on free tier |
| Characters | 25 million+ user-created | 20 million+ |
| Free tier | Yes | Yes (heavily restricted) |
Yes — and for several reasons that go beyond character count. Polybuzz is owned by Zuoyebang, a Chinese company, and does not disclose whether your conversations are used to train its AI. Chai Research is US-based and shares your data with no third parties. Polybuzz's free tier shows ads and resets memory after roughly six messages. Chai AI is ad-free on Web Pro and runs 51,000 in-house trained models rather than reselling access to someone else's.
Yes. Polybuzz's free tier is heavily ad-supported, and voice features require credits that run out quickly. Chai Web Pro is entirely ad-free — no banner ads, no sponsored content, no interruptions.
No. Chai AI does not share your personal data with any third parties. Chai Research is a US-based company and your conversations stay within Chai's own infrastructure. Polybuzz does not publish a clear statement on whether conversations are used to train third-party models.
Yes — Chai AI is free to start. A Pro subscription unlocks unlimited messages and access to the most advanced AI models — starting from $9.83/month.