retell-ai
Retell AI is an LLM-based, voice-first conversational AI platform that builds, deploys, and manages humanlike AI voice agents to automate inbound and outbound phone calls at scale for support, sales, and operational teams.
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Quick Overview
Best for: AI Agents
What it does
AI Agents software for decision-makers comparing workflow fit and alternatives.
Best fit
AI Agents
Pricing snapshot
Free
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retell-ai
Retell is an LLM-based, humanlike, voice-first conversational AI platform designed to build, deploy, and manage AI voice agents for phone call automation. The platform targets large support and sales teams and enterprises that need to automate inbound and outbound calls with natural, low-latency conversations. Retell emphasizes fast setup with minimal configuration, human-quality voices, and support for complex multi-turn conversations and edge cases. Retell positions its solution as a next-generation alternative to traditional IVR and rule-based voice systems by combining proprietary voice AI orchestration, streaming retrieval-augmented generation (RAG), real-time function calling, and enterprise-grade security and compliance.
Platform to build, test, deploy, and monitor AI voice agents.
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Claim this listingKey Features
LLM-powered, humanlike voice agents
Third-generation voice AI that delivers natural, human-quality phone conversations powered by large language models and proprietary voice orchestration.
Low latency (~600ms)
Independent benchmarks referenced on the site indicate industry-leading responsiveness (~600ms) for smooth, fluent conversations.
Ultra-realistic voices & turn-taking
Voices built from real performance data with a proprietary turn-taking model that knows when to speak and when to listen.
Drag-and-drop agentic framework
Highly configurable design framework for building reliable conversational call flows with built-in guardrails and control over agent behavior.
Real-time function calling
Preset and custom functions can be added to call flows so agents can book appointments, process payments, update records, and transfer calls in real time.
Streaming RAG and knowledge auto-sync
Streaming retrieval-augmented generation with automatic synchronization to a knowledge base to ensure accurate, up-to-date answers during calls.
Comprehensive agent testing & simulation
Built-in simulation and testing to validate agent behaviour, accuracy, and reliability across real-world scenarios before launch.
Continuous QA and post-call analysis
Continuous quality assurance to review past calls, surface failure patterns, and provide actionable insights for ongoing improvement.
Performance analytics dashboard
Custom charts and dashboards to analyze call outcomes, agent performance, and business impact.
Telephony features (SIP trunking, branded ID, verified numbers)
Support for SIP trunking to connect existing phone numbers or VOIP providers, Branded Call ID, verified phone numbers, and batch calling with conversion tracking.
Batch calling
Run batch call campaigns without concurrency limits and access detailed conversion tracking after campaigns.
Enterprise security & compliance controls
Controls such as SSO, role-based access, PII redaction, configurable data retention, and on-prem deployment options for strict security and data residency requirements.
Implementation services
Professional FDE-led implementation services to support secure and smooth deployments at enterprise scale.
Inbound & outbound call handling
Agents can handle inbound support and routing, and place outbound calls for reminders, confirmations, lead qualification, surveys, and follow-ups.
Integrations & API
Omni-channel support including voice, chat, SMS, and a flexible API to build and orchestrate custom communication experiences.
Pricing
New accounts receive $10 of free usage on sign-up (site-stated free usage). Full pricing details are referenced on the site but specific plan pricing is not listed in the supplied content.
Use Cases
AI Receptionist
Automates incoming calls, routes callers, answers routine questions, and books appointments without live agents.
Appointment Setter
Handles scheduling and confirmations, integrates with calendars and booking workflows to reduce no-shows and increase utilization.
Lead Qualification
Conducts outbound or inbound qualification conversations to identify viable leads and hand off to sales when needed.
AI Customer Service
Answers support questions, performs lookups and updates, and escalates to humans only for complex issues.
Debt Collection / Reminders
Performs compliant outbound reminders and collection outreach while logging outcomes and updating systems in real time.
AI Dispatch Service
Coordinates dispatch workflows and updates systems during calls for logistics and field services.
Surveys & Follow-ups
Runs surveys, follow-up calls, and confirmations at scale with outcome tracking and analytics.
AI IVR & Call Routing
Replaces traditional IVR with natural conversational routing that handles complex, multi-turn interactions and edge cases.
Integrations
Twilio
Listed integration for telephony connectivity and outbound/inbound call orchestration.
Vonage
Listed telephony integration to connect voice services to Retell agents.
Go High Level
Listed integration for connecting marketing/CRM workflows with Retell agents.
n8n
Listed workflow automation integration to orchestrate data and actions within call flows.
HubSpot
Listed CRM integration to read and update customer records during calls.
Make (Integromat)
Listed workflow automation integration for custom data and process orchestration.
Zapier
Listed integration to connect Retell with a wide range of third-party apps and automations.
Salesforce
Listed CRM integration enabling agents to access and update Salesforce records during calls.
Avaya
Listed contact center/telephony integration for enterprise voice systems.
Genesys
Listed contact center integration to integrate Retell agents with Genesys platforms.
Five9
Listed contact center integration for cloud telephony interoperability.
Amazon Connect
Listed cloud contact center integration to enable voice interactions via Amazon Connect.
Telnyx
Listed telephony integration for SIP and phone number management.
Cal.com
Listed integration for calendaring and appointment booking workflows.
Benefits
Limitations
Frequently Asked Questions
What is an AI voice agent?
How do Retell AI voice agents work?
How do I create AI voice agent with Retell AI?
Can I connect agent to my existing phone number?
What is an AI call center powered by Retell AI?
How is an AI call center different from a traditional call center?
What can Retell's AI phone calls do?
What is an AI calling agent?
Is AI calling compliant and secure?
Getting Started
- 1 Step 1: Sign up for a free Retell account on the dashboard (site states new accounts receive $10 of free usage).
- 2 Step 2: Configure and customize an AI voice agent using the drag-and-drop agentic framework and connect required data sources or knowledge base (auto-sync available).
- 3 Step 3: Connect telephony via SIP trunking or existing VOIP provider, test agents using built-in simulation/testing, then deploy and monitor calls with analytics and continuous QA.
Support
Documentation
Developer and product documentation is listed on the site under 'Documentation' for guidance on building and integrating agents.
Contact Sales
The site references a 'Contact Sales' option to inquire about enterprise plans, implementation services, and demos.
Status Page
A status page is provided (listed on the site) to check system status and operational health.
Community
Community resources such as Discord and other community links are referenced for user engagement and support.
Blog & Changelog
Product updates, changelogs, and articles are available via the site's Blog and Changelog sections.
API
API and developer documentation is available via the site's Documentation resources (listed under 'For Developers').
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