Retell AI

Retell AI is a platform for building and operating AI agents for phone calls, with chat and messaging channels alongside voice. It suits teams that need configurable call workflows and ongoing quality checks. Its broad control over deployment and handoffs is appealing, though per-minute charges and billing for active silence or hold time make usage costs a central consideration.

Overview

Retell brings agent design, deployment, call monitoring, analytics, and testing together. Agents can handle inbound calls and outbound campaigns, as well as web and in-app chat, SMS, and custom communication experiences through an API. That breadth suits teams coordinating voice and digital conversations, while the product’s strongest emphasis remains phone automation.

A visual canvas lets teams construct call flows using functions, integrations, transfers, DTMF, and custom logic. This flexibility can accommodate more involved call journeys than a fixed script, but it favors teams prepared to shape and maintain their own workflows.

Key features

Call workflows and handoffs

IVR navigation, live call monitoring, outbound campaigns, and human takeover or transfer give teams ways to supervise automated calls and route conversations to a person. That is useful when some calls need escalation; teams seeking only a basic chat agent may have less need for this voice-focused control.

Testing and quality assurance

Teams can simulate thousands of scenarios, turn production calls into regression tests, and QA up to 100% of calls. Those tools support repeated checks as call flows change and make Retell a stronger fit for teams that need a structured quality process than for one-off, low-volume automation.

Integrations, security, and deployment

The integrations directory includes Twilio, GoHighLevel, HubSpot, Salesforce, Zapier, Make, n8n, and Google Workspace. Connecting Twilio through elastic SIP trunking lets teams use phone numbers they already own there and supports two-way SMS on connected numbers.

Retell states compliance with HIPAA, SOC 2 Type II, GDPR, and ISO 27001. It also lists single sign-on, configurable module-level role permissions, and user-defined personal information redaction. Its Enterprise on-prem option runs within a customer's infrastructure for security and data residency requirements, which may suit organizations that need that deployment model.

Pricing

Pay as you go costs $0.07 a month and charges $0.07-$0.31 per minute for AI voice agents. It includes $10 in free credits, 20 concurrent calls, full platform access, call analytics and transcripts, and simulation testing. This gives teams access to the full platform without a higher fixed plan price, but the per-minute range and billing treatment mean total spend depends on call usage.

Retell tracks call duration to the nearest second and bills silence or hold time while the speech-to-text engine remains active. That can make long pauses and holds a material part of the bill. The account includes 20 concurrent calls; each additional concurrent call costs $8 per month.

Enterprise is custom pricing, with high capacity for concurrent calls, custom SSO, role-based access control, and dedicated support options. The Enterprise Plan also has custom pricing for AI voice agents and AI chat agents, no cap on concurrent calls, 24/7 omnichannel support through a dedicated portal, and custom SSO. These options target organizations that need higher call capacity or dedicated support, but require a custom quote rather than a published rate. Retell also offers a free plan and a free trial.

Platforms

Retell is available through API, self-hosted deployment, and the web. It supports 55 languages, inbound and outbound calls, and custom phone numbers.

Who it's for

Retell is best suited to teams automating substantial phone workflows that need scenario simulation, regression testing, live oversight, and human escalation. Its integrations and channel support also fit teams connecting calls with CRM, automation, or messaging workflows. It is a weaker fit for buyers who need predictable flat-rate voice costs or only a simple chatbot, since voice usage is billed by the minute and call handling brings more capabilities than that narrower need requires.

Pros and cons

• Strong call-flow control: The visual builder supports transfers, DTMF, integrations, and custom logic for teams with specific call processes.
• Substantial QA tools: Scenario simulation, regression tests from production calls, and QA coverage up to 100% support continuous review.
• Multiple deployment routes: Inbound and outbound calling, web, SMS, and API-based experiences allow teams to serve customers across channels.
• Usage costs need attention: Per-minute rates vary, and active silence or hold time is billable while speech-to-text remains active.
• Capacity can add cost: The included 20 concurrent calls may be insufficient for some workloads; added capacity costs $8 per concurrent call per month.

Alternatives

Voicebot Software, AI Voice Agents, and Conversational AI Platforms are useful categories for comparing other options.

Yellow.ai is a freemium option with web, iOS, and Android platforms and a free plan that includes one AI agent and 500 monthly units.

Guzli offers a free plan and a Hobby plan at $39 a year, with 1,000 message credits per month and one AI agent in the Hobby plan.

Sonalyx has a free tier with 20 minutes and one concurrent call, making it an alternative for readers who want a small allowance to start with.

SoundHound is a mobile option for readers seeking a free, ad-supported app or a one-time 6.99 USD purchase for an ad-free experience.

Haptik is an enterprise alternative with custom pricing and Android, iOS, API, and web platforms.

Chatbyte is a paid chatbot alternative with a free plan and an Essential plan at $45 a month, or $38 a month billed annually.

Mujib offers voice-only and chat-only plans with per-account quotas and rates.

AssistYou offers custom quotes for AI voice agents based on call volume, languages, integrations, and compliance requirements.

Verdict

Choose Retell AI if your team needs configurable phone agents backed by serious testing, monitoring, and human handoff. Its breadth of workflows and deployment channels is the main reason to choose it; the per-minute pricing, billable active silence and holds, and 20-call included capacity are the main reasons to compare alternatives before committing.