Video call with an AI character

Cách làm

1. Bấm 📞 Gọi. Anna chào bạn.
2. Giữ nút 🎤 Nói (hoặc gõ) để trả lời.
3. Cuộc gọi dài 2 phút; kết thúc có bản ghi lại.

How real is this example

The 'video' is a real photo with a speaking indicator, not a talking avatar. Anna's voice is the browser voice. Scripted Anna asks 5 fixed small-talk questions.

AI: the page first asks our small server function (/api/chat) which holds the AI key; the key is never in the page. No key is set yet, so every reply you see now comes from a script we wrote (badge: 'Bản kịch bản'). Once a key is added on Cloudflare the same page switches to real AI with no code change. Typing works everywhere; the 🎤 button needs Chrome or Edge outside the claude.ai frame.

See it in the real world

• Duolingo blog – Video Call ↗official page · paidReal-time talk with Lily, starting from a topic you just studied
• Duoplanet – Duolingo Video Call guide ↗teacher blog · free2–6 minute calls, tap-to-speak button, transcript afterwards
• How to Video Call with Lily (quick guide) ↗YouTube walkthrough · freeWhere to find the call and what it looks like
• Video Call: Real chats with Lily on Duolingo ↗YouTube walkthrough · freeDuolingo engineering lead demoing the feature