Retell AI
Retell AI is a YC-backed AI call center platform that enables businesses to build, deploy, and manage AI-powered phone agents for sales, support, and appointment scheduling. With advanced conversational AI, integrations, and automation tools, Retell AI helps companies streamline customer interactions and scale voice operations efficiently.
| What is it | Retell AI is a YC-backed AI call center platform that enables businesses to build, deploy, and manage AI-powered phone agents for sales, support, and appointment scheduling. With advanced conversational AI, integrations, and automation tools, Retell AI helps companies streamline customer interactions and scale voice operations efficiently. |
|---|---|
| Pricing | Paid |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | Integrately, Make, Zapier |
| Best for | automating customer service inquiries, scheduling appointments and reminders |
| Domain registered | 2023 |
Data updated Aug. 1, 2026
What does Retell AI do?
Retell AI is a platform that lets businesses build and deploy AI voice agents to handle phone calls autonomously. These agents can manage everything from customer service inquiries and appointment scheduling to lead qualification and debt collection calls. They're designed to operate over standard phone lines, interacting with callers in real-time without the robotic, menu-driven experience of traditional IVR systems.
The platform stands out through its focus on ultra-low latency (around 600ms) and highly realistic, human-like speech. It uses a proprietary turn-taking model to ensure natural conversation flow and offers a configurable agentic framework for designing call flows. Key technical features include real-time function calling for actions like booking appointments, streaming RAG for accessing up-to-date knowledge bases, and tools for managing complex, multi-turn conversations that can handle unexpected inputs.
This tool is ideal for businesses drowning in inbound calls, particularly in healthcare, customer support, and sales. Medical clinics use it to schedule appointments and reduce phone tag, EV support companies deploy it for 24/7 urgent assistance, and collection agencies utilize it to scale outreach. It's a practical solution for any organization looking to automate routine phone conversations while maintaining a high-quality, human-like experience for their callers.
Key features
What makes it stand outWho is Retell AI for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardPay as you go
- 10 knowledge bases
- 20 concurrent calls
- 0.002 AI chat agent rate
- 0.07 AI voice agent rate
- Pre-build Functions
- Simulation Testing
- Analytics
- Discord and Email support
Enterprise Plan
Everything in Pay as you go, plus:
- Custom deployment and support
- Fully managed agent setup
- Additional Included concurrency
- Early access to beta features
- Higher Limit on Knowledge Bases
- Custom concurrent calls based on volumes
- Premium private Slack channel support with dedicated support teams
Trust & presence
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