Retell AI
by Retell AI
FreemiumVoice AI platform for building and deploying conversational phone agents with low latency, pay-per-minute pricing, and developer-friendly API.
Overview
Retell AI is a developer-focused voice AI platform for building, testing, and deploying conversational phone agents. It handles the voice pipeline end-to-end — speech-to-text, LLM orchestration, and text-to-speech — so developers can focus on conversation logic rather than audio infrastructure. The result is phone agents that respond with sub-second latency, sounding natural enough for real customer interactions.
The platform supports multiple LLM backends (OpenAI, Anthropic, custom models) and offers pre-built templates for common use cases like appointment scheduling, lead qualification, and customer support triage. Retell’s API-first design means agents can be integrated into existing phone systems, CRMs, and scheduling tools with minimal code.
Retell AI is best suited for developers, agencies, and businesses deploying AI phone agents at scale — from dental offices automating appointment bookings to sales teams qualifying inbound leads. Its 4.8 G2 rating from 1,400+ reviews reflects strong developer satisfaction, though customer support (Discord-only) remains a weak spot.
Pricing
- No platform fee
- $10 free credits (~60 minutes)
- 20 concurrent calls included
- Full platform access with no commitment
- Volume discounts drop to ~$0.05/minute
- Dedicated support, SLA guarantees, and higher concurrency limits. Note: Real production costs run $0.11–$0.15/min including LLM ($0.003–$0.08/min), telephony ($0.015/min), and optional extras
- Calls under 15 seconds are not billed
- Additional concurrent call slots cost $8/month each