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AI phone-agent platform for inbound and outbound voice — from $0.07/min for Retell Voice, sub-second latency, bring-your-own-LLM, HIPAA-ready, with a no-code Agent Studio.
AI phone-agent platform for inbound and outbound voice — from $0.07/min for Retell Voice, sub-second latency, bring-your-own-LLM, HIPAA-ready, with a no-code Agent Studio.
Retell AI (retellai.com) is an AI voice-agent platform focused specifically on production-grade phone calls — inbound and outbound — where a call feels close to natural despite being fully automated. It stitches together the pieces that make real-time voice work: speech-to-text with low latency, an LLM for reasoning, streaming text-to-speech in dozens of voices, interruption handling, and turn-taking, all behind a single API and a browser-based Agent Studio. Where competitors often lock you into a single LLM, Retell lets you plug in OpenAI, Anthropic, Google, or your own fine-tuned model per agent. Prompts, tools/functions, knowledge bases, and telephony (Twilio, Vonage, or Retell-provisioned numbers) are configurable per flow. Pricing is usage-based per minute of connected call: Retell Voice starts around $0.07/min and scales up to about $0.31/min for premium voice tiers, with cheaper 'Retell LLM' voice-only tiers around $0.015–$0.055/min and higher premium models topping out near $0.32/min — LLM tokens billed separately based on the model you choose. There's a free trial, and Enterprise agreements cover volume discounts, HIPAA BAAs, dedicated support, and on-prem options. Retell has become one of the most-adopted voice-AI platforms for AI receptionist, appointment-setting, lead-qualification, and support use cases.
Retell AI is the right pick when an operations leader buys voice AI and HIPAA/PCI is non-negotiable — Vapi remains the alternative for developer-led builds.
The full ASR → LLM → TTS loop is tuned for real telephone lines, not lab conditions. Under half a second of latency is what separates "feels like a person" from "feels like an AI phone bot."
Connect Twilio, Vonage, or direct SIP without writing your own PSTN glue. Retell handles the codec conversion, RTP jitter, and DTMF forwarding so you focus on the agent logic.
Bring OpenAI, Anthropic, Google, or Retell's own model for the turn, and pair with ElevenLabs, Cartesia, PlayHT, or others for TTS. Swap providers per agent without rewiring.
When the agent decides it can't help, it can transfer to a live human with the full call context — critical for high-value or regulated conversations.
Run outbound campaigns with baked-in DNC (do-not-call) list checks, TCPA time-window enforcement, and per-jurisdiction rules. Avoids the FCC fines that get amateur AI-call startups shut down.
The LLM turn can invoke any MCP server as a tool — look up an order in your CRM, book a Cal.com slot, file a Zendesk ticket, or hit an internal API without the agent hallucinating an answer.
Free
From ~$0.07/min (up to ~$0.31/min premium)
$0.015 – $0.055/min
Custom
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We believe in transparent reviews. Here's what Retell AI doesn't handle well:
Through early 2026 Retell AI has continued to push on conversation quality and enterprise readiness: the turn-taking model has been refined to better handle pauses and interruptions, the conversation-flow builder has expanded with richer tool-calling and branching, and the platform has broadened its multilingual voice catalog. HIPAA-compliant deployments and SOC 2 controls have matured, making Retell one of the more credible voice agent platforms for healthcare and financial-services workloads. The company highlights an aggregate rating of 4.8 across more than 900 reviews and continues to be featured among Y Combinator's top voice AI companies.
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Pricing and features change often. If anything on this Retell AI page is wrong or missing, tell us and include a link to the source. We review every correction.