Retell AI review

Retell AI fits the way agencies work: you sign up, get $10 in credits and 20 concurrent calls, and pay only for minutes with no annual contract. The pricing page lists $0.07 to $0.31 per minute for voice agents and its calculator breaks a call into LLM cost, a $0.055 voice infrastructure fee, text-to-speech and telephony, so you can quote a client a real number before you build. Agents are designed on a drag-and-drop canvas with functions, call transfers, DTMF and SMS steps, and the platform adds outbound campaigns with pacing and retries, IVR navigation and live call takeover. Voices come from several providers, including ElevenLabs, Cartesia, OpenAI and Inworld, and calls can run on Retell, Twilio or Telnyx numbers or your own SIP trunk at no extra charge. Retell lists HIPAA, SOC 2 Type II, GDPR and ISO 27001 compliance. The limits: premium models push the rate toward the top of the range, and contract terms, SSO and dedicated support are Enterprise items.

Who it is for

Agencies and developers who want to launch phone agents for clients fast, with no contract and a visual builder their team can maintain.

Price

Pay as you go from $0.07 to $0.31 per minute depending on LLM, voice and telephony; $10 in free credits; Enterprise is custom.

$0.07-$0.31 / min for AI Voice Agents
Quoted from the vendor pricing page on November 7, 2026.

Key features

• Drag-and-drop call flow canvas with functions, transfers, DTMF and SMS steps
• Outbound campaigns with pacing, retries and voicemail handling
• IVR navigation that presses digits and enters extensions during a live call
• Live call monitoring with instant human takeover
• Simulation testing, call analytics and transcripts on pay as you go

Strengths and weaknesses

• Strength: 20 concurrent calls included without a contract
• Strength: Per-minute calculator shows the LLM, voice infrastructure, TTS and telephony split
• Strength: No charge for SIP trunking or custom telephony
• Weakness: Rates range more than fourfold depending on the model and voice you choose
• Weakness: Dedicated implementation support and a stable server are paid add-ons
• Weakness: Custom MSA, SSO and HIPAA BAA sit on the Enterprise plan

Key facts

• Free credits: $10 to start
• Voice infrastructure: $0.055 per minute
• Concurrent calls: 20 on pay as you go

Where it ranks

Retell AI is No. 1 in our Best AI Voice Agent Platforms verdict and No. 2 in Best AI Voice Agents.