Retell AI Review: Features, Pricing & Alternatives

What is Retell AI?

Retell AI is a platform for building AI voice agents that answer inbound calls, make outbound calls and hand off to humans when needed. It also supports chat and SMS agents. Businesses use it to automate support lines, book appointments, qualify leads and run large calling campaigns, configuring agents in a visual dashboard or through its API.

Retell AI was founded in 2023 and is based in Palo Alto. It raised a $4.6 million seed round led by Alt Capital in 2024, with Y Combinator participating. In December 2025 the company said it was handling more than 40 million AI phone calls a month and announced Retell Assure, an automated quality assurance product that became available from 1 January 2026. Its changelog has since highlighted Retell Workflows for structured call flows.

Retell stands out for combining an easy builder with enterprise-grade controls. Pricing is bundled per minute, from $0.07 to $0.31 depending on the LLM, voice and telephony you pick, and every pay-as-you-go account gets 20 concurrent calls at no extra cost. Retell lists HIPAA, SOC 2 Type II, GDPR and ISO 27001 compliance, which matters for healthcare, finance and other regulated teams.

Key features of Retell AI

• Visual agent builderDesign prompts and structured conversation flows in a dashboard, with options for appointment booking, IVR navigation and knowledge base answers.
• Call transfer and handoffTransfer calls to human agents mid-conversation, including warm handoffs with context.
• Batch callingRun outbound campaigns at scale with voicemail handling and retry management.
• Knowledge basesConnect documents and web content so agents answer from your own information. The first 10 knowledge bases are free.
• Post-call analysis and QACustom metrics, transcripts and analytics, plus Retell Assure AI quality assurance that can review up to 100% of calls.
• Integrations and complianceWorks with Twilio, Vonage, Make, n8n, HubSpot and Go High Level, with SSO, RBAC and personal data redaction options.

Who is Retell AI best for?

• Customer support teams that want to automate routine calls and transfer complex ones to staff.
• Healthcare and service businesses that need appointment booking and reminders with HIPAA-compliant handling.
• Sales and lead-gen teams running outbound qualification or follow-up campaigns at volume.
• Agencies and developers building voice agents for clients through Retell’s API and integrations.

Popular ways to use Retell AI

• After-hours support: answer calls 24/7 and route urgent issues to an on-call human.
• Appointment scheduling: book, reschedule and confirm appointments over the phone.
• Outbound campaigns: call lists of customers for reminders, surveys or renewals.
• Lead qualification: screen inbound leads and log results in HubSpot.
• Call quality monitoring: use automated QA to spot failed calls and improve agents.

Retell AI pricing (October 2026)

Your per-minute rate is the sum of voice infrastructure, the LLM, the voice provider and telephony, so premium models cost more. Prices are from Retell’s pricing page in October 2026; there is no annual contract on pay-as-you-go.

Retell AI pros and cons

How to get started with Retell AI

1. Create an account at retellai.com and claim the $10 free credits.
2. Pick a template or start a new agent, then write its prompt or build a flow.
3. Choose an LLM and voice, and upload documents to a knowledge base.
4. Buy or import a phone number via Twilio, Vonage or SIP and run test calls.
5. Set up call transfer, post-call analysis and integrations before going live.

Tips to get better results from Retell AI

• Use a cheaper LLM for simple tasks to keep per-minute costs low.
• Define post-call analysis fields early so you can measure success.
• Test batch campaigns on a small list and check local calling rules first.
• Add a clear human handoff for complaints, billing disputes and sensitive topics.

Retell AI vs alternatives

The most common comparison is with Vapi. Vapi offers more model-level control and pass-through pricing for developers, while Retell is easier to set up and includes 20 free concurrent calls. ElevenLabs offers voice agents built on its own voices, and Voiceflow suits teams designing agents across chat and voice.

For a complete support platform rather than a voice agent builder, Intercom Fin, Zendesk AI and Sierra combine AI agents with ticketing and omnichannel support, usually at higher, contract-based prices. See all best AI customer support tools.

Our verdict: is Retell AI worth it?

Retell AI FAQs

Pricing and features change often. Details on this page were last reviewed in October 2026. Always confirm current plans on the official Retell AI website.