Retell AI
Developer-first conversational voice AI platform to build, test, and deploy realistic voice agents.
Quick Keypoints
- Builds realistic conversational voice agents with sub-second latency and interruption handling.
- Supports inbound and outbound phone calls, WebRTC browser calling, and SIP trunking.
- Transparent pay-as-you-go per-minute pricing with no monthly platform fees.
- HIPAA and GDPR compliant with SOC 2 Type II certification.
What is Retell AI?
Retell AI is a conversational voice AI platform that provides low-latency telephony infrastructure, custom voice agent builders, and developer SDKs with flat per-minute pricing.
Retell AI is a developer-focused platform that enables engineering and product teams to create, test, and deploy production-ready conversational AI voice agents. It combines real-time speech recognition, LLM reasoning, and natural speech synthesis into an ultra-low latency voice stack.
Who Needs Retell AI?
Developers, AI startups, SaaS platforms, and contact center innovators building voice-driven apps.
Primary Use Cases
- Deploying customer support and inbound appointment booking agents.
- Building interactive voice agents for automated outbound surveys and sales outreach.
- Integrating conversational voice capabilities directly into web applications via WebRTC.
Important Features
- Low-Latency Voice Engine: Realistic back-and-forth dialogue with responsive turn-taking.
- Multi-Prompt & Flow Builder: Visual and code-based workflows for complex conversational logic.
- Telephony & WebRTC: Native phone number provisioning, SIP trunking, and web SDKs.
- Post-Call Analytics: Automated transcription, structured data extraction, and call scoring.
Current Updates About Retell AI
- Added hosted MCP server support, conversation flow builders, and enhanced real-time multilingual turn-taking in 2026.
- Current Version: v5.0
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Pricing Plans
| Plan | Price |
|---|---|
| Pay As You GoFlat per-minute usage billing, no platform fee, free trial credits included. | From $0.08/min |
| Scale / EnterpriseVolume discounts, dedicated infrastructure, enterprise SLAs, and custom model routing. | Custom |
Editorial Verification
Independent Testing
This review was audited under our 5-Pillar Testing Framework: Output Quality, UI/UX Ease, Pricing Transparency, Feature Depth, and Support.
Read Our Review Methodology →Explore Related Voice & Audio AI Tools
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