Retell AI
7.1/10A developer-focused platform for building, testing, and running AI voice and chat agents that handle inbound and outbound business phone calls.
Data last updated November 2026 · Our methodology
Overview
Retell AI is a Y Combinator-backed platform for building AI phone agents. These agents answer and place calls, qualify leads, book appointments, navigate IVRs, and transfer callers to humans with cold, warm, or two-way warm handoffs. It also supports chat and SMS agents that share contact memory with voice agents. Builders can work in a node-based conversation flow editor or through the API. They can choose LLMs from OpenAI, Anthropic, Google, and others, and pick text-to-speech voices from providers such as ElevenLabs, Cartesia, and Minimax. Testing tools include AI-simulated callers and batch tests. After calls, Retell offers post-call analysis, sentiment analysis, and AI quality assurance. Pricing is pay-as-you-go with no platform fee and $10 in free credits. A voice minute combines the $0.055 voice engine, TTS (from $0.015), the chosen LLM, and $0.015 telephony, for roughly $0.07 to $0.31 per minute. Twenty concurrent calls are included, with extra capacity at $8 per call per month. Enterprise plans have custom pricing and add SSO, HIPAA BAAs, custom data retention, and higher concurrency. Native connectors cover Twilio, Vonage, HubSpot, Go High Level, Make, and n8n, and SIP trunking is free to bring. The main limitation is that the product is built for teams with developers. Custom tools need code, testing is billed at production rates, and the stacked per-minute pricing makes monthly costs hard to forecast.
Our Rating
Who Retell AI is best for
Best software for DevelopersGood fit
Reviews describe an API-first platform where custom functions require code.
The Go High Level, Make, and n8n connectors suit agencies that build agents for clients.
It handles inbound call automation with human transfer and QA, but has no native helpdesk-style ticketing.
Enterprise plans add SSO, RBAC, custom concurrency, and named customers such as CVS Health and Lenovo.
It offers a HIPAA BAA and PII redaction, with enterprise data retention controls.
It supports outbound batch calling, lead qualification, appointment booking, and a HubSpot integration.
Less suited
There is no fixed fee, but non-technical owners face a learning curve.
Pros & Cons
Pros
- Reviewers repeatedly praise natural, low-latency voices and smooth handling of interruptions.
- You can choose among LLMs and TTS providers per agent and trade cost against quality.
- There is no platform fee, billing is per second, and failed calls are not charged.
- Compliance coverage is strong: SOC 2 Type 2, HIPAA with a BAA, and GDPR, with PII redaction built in.
- Native connectors for HubSpot, Go High Level, Make, n8n, Twilio, and Vonage, plus free SIP trunking.
- G2 shows a rating of about 4.8 from thousands of reviews.
Cons
- Custom functions need code, so non-developers face a real learning curve.
- Costs stack across engine, TTS, LLM, telephony, and add-ons, which makes monthly spend hard to predict.
- Testing is billed at production rates, and there is no free sandbox.
- Some Trustpilot reviewers report slow support routed through Discord.
- SSO and HIPAA BAAs require the custom-priced Enterprise plan.
Key Features
Retell AI Pricing
Enterprise
- Custom pricing
- Custom data retention
- HIPAA BAA, custom MSA and DPA
- Custom concurrency from 50+ calls
- SSO and role-based access control
- 24/7 support portal and named account manager
Pay as you go
- Per-second billing
- 10 knowledge bases free
- $10 free credits on sign-up
- 20 concurrent calls included
- Chat agents from $0.002 per message
- Safety guardrails and PII redaction
- Voice agents about $0.07-$0.31 per minute
Frequently Asked Questions
New accounts get $10 in free credits on the pay-as-you-go plan, with no subscription.
Voice agents cost about $0.07 to $0.31 per minute. Retell's own calculator example comes to $0.11 per minute: $0.055 voice engine, $0.015 TTS, and about $0.04 for the LLM.
Yes. Retell does not charge telephony fees when you bring your own SIP trunk or custom telephony, such as Twilio or Telnyx.
Retell states HIPAA compliance and offers a BAA. Its pricing page lists the BAA and custom data retention under Enterprise. It also claims SOC 2 Type 1 and Type 2, GDPR, and ISO 27001.
Pay-as-you-go includes 20 concurrent calls, with more at $8 per call per month. Burst overflow costs $0.10 per minute. Enterprise plans start at 50 or more concurrent calls.
Yes. It has native HubSpot and Go High Level connectors, plus Make and n8n, and you can call any API through custom functions.
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