"API for building human-like conversational voice AI"
Retell AI helps developers implement human-like voice agents in a day instead of months. Plug in your LLM, a voice agent is born!
Founded by Zexia Zhang, Weijia Yu, Bing Wu, Evie Wang, and Todd Li
About Retell AI
You can now use Retell AI's API to build human-like voice AI agents with your LLM. They've achieved response times averaging 800ms, reaching the level of human interactions. (see the demo or call +1 (415) 831-7577 to try it out).
Check out this video ⤵️
The Problem — Building human-like voice AI agents is hard
- Human-like interaction is hard: Building a voice AI agent that can talk seems easy (stitching together speech-to-text, LLM, and text-to-speech), but making it interact like humans is hard. In human conversation, one has to respond fast and handle all kinds of situations (handling interruptions, knowing when it's your turn to speak, etc).
- Long development time: Developers building voice products spend hundreds of hours focusing on the voice conversation experience alone.
- Quality often falls short: Current voice AI products often have long response latency (>3s), do not know when to appropriately speak (might interrupt you too much, or don't respond quickly enough), and do not handle user interruptions well (AI and human talking over each other), and the list goes on.
The Solution — API for building human-like voice AI agents
- Human-Like Conversations: With Retell AI's API, you can build a superior voice conversation experience with your LLM. They've achieved response times averaging 800ms, reaching the level of human interactions. Retell AI also handles interruptions and provides smart turn-taking determination to achieve seamless conversational exchanges.
- Connect your LLM easily: Plug in your LLM and create a human-like voice agent easily.
• WebSocket Support: Connect directly with your users through your web frontend or via phone. You won't have to manage audio bytes – Retell AI will handle that for you.
Who is this product meant for?
Anyone building a voice experience can benefit from using the platform. Whether you're developing AI call agents, AI coaching apps, or AI lifelike companions, Retell AI is your trusted ally in creating the best conversational experience for your users.
How to get started ⤵️
- Try the live demo at https://www.re-tell.ai/ (no signup needed)
- Self-serve by registering an account
- Explore their API Documentation
