# Retell AI

> Voice AI platform for building and deploying autonomous phone agents

Source: https://dailyaitools.ai/tools/retell-ai/ (dailyaitools, a tracker of AI tools; no ratings or reviews)

## Key facts

- Category: Agents
- Price: From $0.07 usage-based
- Free plan: No, from $0.07 usage-based
- Works on: Web, API
- Integrates with: Twilio, Telnyx, Salesforce, HubSpot, Zapier, n8n
- Website: https://www.retellai.com
- Verification: Checked against the vendor's pages on October 12, 2026, prices included.

## What it is

The platform combines speech recognition, text-to-speech synthesis, telephony, and language models into a unified conversational pipeline. Teams can swap underlying LLMs dynamically, connect existing telephony through SIP trunking, and call external tools or CRMs during active calls. Billing follows a usage-based structure charged per call minute without recurring platform fees, supplemented by enterprise tiers for custom deployments.

## Plans

| Plan | Price | Free-plan limit or note |
| --- | --- | --- |
| Pay as you go | $0.07 usage-based | 20 concurrent calls |
| Enterprise Plan | Custom | Custom pricing for high-volume deployments |

Prices as printed on https://www.retellai.com/pricing. Nothing is converted or annualized.

## Features

- Sub-second voice response latency of approximately 600ms
- Interruption handling that pauses speech when callers cut in
- Support for more than 50 languages with mid-call switching
- SIP trunking and BYO telephony support for Twilio and Telnyx
- Live human handoffs with context transfer

## Good fit for

- Automating inbound support lines and after-hours call routing
- Running multi-step outbound calling campaigns and appointment scheduling
- Developers needing programmatic voice primitives and custom LLM integration

## Questions

### Is Retell AI free?

No, Retell AI publishes no free plan, as of October 12, 2026. Paid plans start at $0.07 usage-based.

### How much does Retell AI cost?

As of October 12, 2026, Retell AI lists 2 plans: Pay as you go at $0.07 usage-based, Enterprise Plan (custom pricing).

### What response latency does Retell AI achieve on phone calls?

Retell AI achieves approximately 600ms response latency for conversational turn-taking, allowing smooth interactions without long pauses.

### Can Retell AI transfer live calls to a human agent?

Yes. Retell AI supports warm transfers where the AI briefs human agents and answers preliminary questions before completing the handoff.

### Can developers use their own language models with Retell AI?

Yes. Retell AI supports connecting a custom LLM over WebSockets while the platform manages telephony and conversation turn-taking.

## Sources

- https://www.retellai.com/llms.txt
- https://www.retellai.com
- https://www.retellai.com/pricing

Listed October 12, 2026.