Retell AI
Retell AI is a voice-first AI agent platform that automates enterprise call center calls via LLM-based agents with sub-second latency, omnichannel deployment, and HIPAA/SOC 2/GDPR compliance. It serves thousands of business clients across healthcare, financial services, insurance, and other regulated verticals.
- Company typePrivate
- Founded2024
- HeadquartersRedwood City, United States
- Headcount101–250
- GTM typeB2B
- OfferingSoftware
What Retell AI does
Retell AI is a voice-first AI agent platform that automates inbound and outbound phone calls for enterprise and mid-market call centers. Founded in 2024 and headquartered in Redwood City, California, the company builds LLM-based conversational AI agents engineered specifically for live phone conversations rather than adapted from chat. Its core product, the Retell AI Voice Agent Platform, combines proprietary Voice AI Orchestration, a dynamic turn-taking model that handles pauses, interruptions, and backchanneling, streaming RAG with auto-syncing knowledge bases, and a telephony-native architecture supporting SIP, VoIP, and PBX infrastructure. The platform is LLM-agnostic, supporting GPT (including GPT-5), Claude, Gemini, open-source models, and customer fine-tunes through a Custom LLM interface, with a JavaScript SDK and MCP server exposed to developers. It is benchmarked at ~600ms sub-second end-to-end latency and supports 50+ languages, omnichannel deployment (voice, chat, SMS, email), and enterprise compliance (HIPAA, SOC 2 Type 1 & Type 2, GDPR).
The platform is augmented by tightly integrated modules: Call Transfer with 3-way warm transfers, Book Appointments, Navigate IVR, Batch Call, Branded Call ID, Verified Phone Numbers, Post Call Analysis, and AI Quality Assurance — the last of which is also marketed as a standalone product called Retell Assure, the voice AI industry's first automated QA solution. An in-product AI development assistant named Conductor helps non-technical users build and refine voice agents. As of mid-2026, Retell AI reports $60M ARR, 55M+ AI phone calls per month, and "thousands of business clients" spanning healthcare, financial services, insurance, logistics, home services, retail, travel, and debt collection. Named enterprise customers include Pine Park Health, SWTCH, Medical Data Systems, Everise, Anker, Asbury Auto, StorageVault, and SelectQuote.
Retell AI generates revenue through a hybrid model: usage-based billing on Voice AI minutes at $0.07/min (automated via Stripe), recurring monthly subscriptions on phone numbers, knowledge base slots, and concurrency add-ons, a self-serve free trial offering $10 of usage on signup, and enterprise contracts that bundle FDE-led implementation and on-prem deployment for regulated workloads. Go-to-market combines product-led growth (self-serve dashboard, developer-first API), direct enterprise sales (Contact Sales CTA, Enterprise Plan), and an expanding Certified Partner and App Partner channel that has already extended the platform into the UK via Antek Automation. With only $4.6M of seed capital raised to date from Alt Capital, Y Combinator, and Carya Venture, the company has scaled to $60M ARR and disclosed profitability as of January 2026 on a lean 10–24 person team, signaling strong capital efficiency relative to peers in the voice AI category.
Retell AI firmographics
Firmographics- Name
- Retell AI
- Legal name
- Retell AI Inc.
- Website
- https://retellai.com
- Company type
- Private
- Founded year
- 2024
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Retell AI is a voice-first AI agent platform that automates enterprise call center calls via LLM-based agents with sub-second latency, omnichannel deployment, and HIPAA/SOC 2/GDPR compliance. It serves thousands of business clients across healthcare, financial services, insurance, and other regulated verticals.
- Ownership category
- akta.pro rank
Retell AI industry classification
Industry- Product category
- Conversational AI / Voice AI Platform
- NAICS
- Telephone Call Centers (56142), Custom Computer Programming Services (541511)
- SIC
- Services-Computer Programming, Data Processing, Etc. (7370)
- akta.pro primary industry
- Contact Center Speech AI (agent assist, IVR automation) (HDAAAFAL)
- akta.pro secondary industries
- Conversational AI Platforms (chat/voice bots, orchestration) (HDAAAFAC), Agents & Autonomous Workflows (Tool Use, Planning, Multi-Agent) (HDAAACAF)
Keywords
Where Retell AI is headquartered
LocationHeadquarters
- HQ city
- Redwood City
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Retell AI business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Infrastructure, Personnel, Operations, Marketing or Sales
Revenue model
- Usage-based Voice AI minutes: Primary revenue stream priced at $0.07/min for Voice AI consumption; pay-as-you-go metered model with usage-based billing handled via Stripe automation.
- Recurring subscriptions for telephony, knowledge, and concurrency: Monthly recurring subscriptions on phone numbers ($2/month standard, $5/month toll, $10/month + $10 setup verified), extra knowledge base slots ($8/month each beyond 10 free), and concurrency add-ons ($8/month each beyond 20 free).
- Freemium / Free Trial: Self-serve free trial that includes $10 of free usage on signup, enabling product-led acquisition into usage-based and subscription revenue.
- Enterprise professional services and on-prem: FDE-led implementation, customized professional services, and enterprise on-prem deployment for large regulated customers; bundled into enterprise contracts.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Usage-based | Pay-as-you-go | Voice AI at $0.07/min with telephony, knowledge base, and concurrency add-ons |
| Subscription | Monthly | Phone numbers, knowledge base slots, and concurrency on monthly subscription |
| Freemium | Pay-as-you-go | Free trial / freemium |
| Other | Multi-year contract | Enterprise custom contracts |
Go-to-market motion4 records
Distribution channels5 records
Marketing channels9 records
Retell AI product offering
Product offeringCore offering
Retell AI provides an LLM-based AI voice agent platform that enables businesses to build, test, deploy, and monitor AI agents for automating inbound and outbound phone calls. The platform is designed for call center automation across verticals including healthcare, financial services, insurance, home services, debt collection, logistics, retail, and travel, offering voice AI with sub-second latency and telephony-native architecture.
Product overview
Retell AI offers a single unified product — the Retell AI Voice Agent Platform — that functions as a voice-first, LLM-based, 3rd generation conversational AI platform for call center automation. The core platform is augmented by a portfolio of tightly integrated modules and features: Call Transfer, Book Appointments, Knowledge Base (streaming RAG), Navigate IVR, Batch Call, Branded Call ID, Verified Phone Numbers, Post Call Analysis, and AI Quality Assurance. The QA module is also marketed as the standalone add-on Retell Assure (the voice AI industry's first automated QA solution), and an in-product AI development assistant called Conductor helps non-technical users build and refine voice agents. Together, these capabilities deliver end-to-end enterprise voice automation across voice, chat, email, and SMS channels, with omni-channel deployment supported by native integrations to CCaaS platforms (Genesys, Five9, Avaya, Amazon Connect), CRMs (Salesforce, HubSpot, Go High Level), and iPaaS workflow tools (Make, n8n, Zapier).
Differentiator
Problem solved
Functional benefit
Brands
- Retell Assure: Automated QA solution for Voice AI that monitors 100% of Voice AI calls in real time and automatically improves voice AI models, reducing reliance on human oversight. Launched as the first automated QA solution for Voice AI.
- Conductor
Products and services
- Retell AI Voice Agent Platform LLM-based AI voice agent platform that enables businesses to build, test, deploy, and monitor AI agents for automating inbound and outbound phone calls. Targets enterprise and mid-market companies in healthcare, financial services, insurance, home services, debt collection, logistics, retail, and travel.
- Retell Assure Automated QA and evaluation solution that scores and assesses AI voice agent performance on every call, providing enterprise-grade monitoring and quality control for customer deployments.
- Conductor (AI Assistant) In-product AI assistant that guides users through the Retell AI platform, helping customers build, test, and optimize voice agent workflows.
Companies that use Retell AI
Customer profileNamed customers8 records
Segments10 records
Ideal customer profiles2 records
Retell AI technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration14 records
AI capability14 records
Feature12 records
Retell AI partnerships and signals
Strategic signalPartnerships
15 partnerships are on record, tiered flagship uk implementation partner, flagship telephony integration, core telephony integration, flagship crm integration, core crm integration, core workflow integration, core ccaas integration, flagship llm partner and core billing infrastructure.
- Antek Automationflagship uk implementation partnerAntek Automation, a Hampshire-based AI automation agency, achieved Certified Retell AI Partnership status on January 7, 2026, delivering enterprise-grade AI voice agents to UK service businesses in trades, cleaning, professional services, and healthcare.
- Twilioflagship telephony integrationTwilio is integrated as a primary telephony provider for Retell AI voice agents, supporting inbound and outbound calls, number provisioning, and SIP trunking. Twilio is also referenced as a communications platform provider under Retell's privacy and security architecture.
- Vonagecore telephony integrationVonage is integrated into Retell AI's telephony stack, enabling customers to use Vonage phone numbers and routing for AI voice agent calls.
- Telnyxcore telephony integrationTelnyx is listed as a supported telephony integration for Retell AI voice agent deployments.
- HubSpotflagship crm integrationRetell AI has a native HubSpot Marketplace app that enables 'Make a Phone Call' workflow actions; supports contact sync, call recordings, and post-call analysis syncing back into HubSpot timelines.
- Salesforcecore crm integrationSalesforce is one of Retell AI's supported CRM integrations for syncing contacts, call data, and post-call analysis; Retell also offers a Salesforce connector via OAuth 2.0.
- Make (Integromat)core workflow integrationMake is integrated as a no-code automation platform for connecting Retell AI voice agents to other apps and workflows.
- n8ncore workflow integrationn8n is integrated as a workflow automation partner, enabling developers to connect Retell AI to WhatsApp and other channels via webhooks.
- Zapiercore workflow integrationZapier is integrated as a no-code workflow automation layer for Retell AI agents to connect with thousands of third-party apps.
- Avayacore ccaas integrationAvaya is listed as a supported contact-center-as-a-service (CCaaS) integration for Retell AI voice agents.
- Genesyscore ccaas integrationGenesys is listed as a supported contact-center-as-a-service (CCaaS) integration for Retell AI voice agents.
- Five9core ccaas integrationFive9 is listed as a supported contact-center-as-a-service (CCaaS) integration for Retell AI voice agents.
- Amazon Connectcore ccaas integrationAmazon Connect is listed as a supported contact-center-as-a-service (CCaaS) integration for Retell AI voice agents.
- OpenAIflagship llm partnerOpenAI spotlighted Retell AI for code-free voice agents on GPT-4o; Retell also launched GPT-5 for voice agents. As an LLM-agnostic platform, OpenAI models are a core part of Retell's underlying intelligence.
- Stripecore billing infrastructureRetell AI uses Stripe to automate usage-based pricing at scale for its AI voice agent platform, enabling seamless billing on a pay-as-you-go model.
Scale indicators12 records
Recent moves6 records
Expansion highlights6 records
Retell AI competitors and assessment
Company assessmentDirect peers
- Vapi: Vapi is a developer-focused voice AI agent platform that lets builders create, test, and deploy conversational voice agents over telephony. It is the most direct competitor to Retell AI's voice agent platform, targeting similar developers and enterprise call center use cases with usage-based pricing and LLM-agnostic tooling.
- Bland AI: Bland AI is an enterprise voice AI platform for automating inbound and outbound phone calls using LLM-powered agents. Like Retell, it targets enterprise contact center automation with telephony-native infrastructure and is listed as a direct comparison on Retell's own competitor page.
- Synthflow: Synthflow offers a no-code AI voice agent platform for sales and support calls. It directly competes with Retell in the SMB-to-mid-market segment with a similar self-serve model and telephony integrations.
- Decagon: Decagon provides AI customer support agents across chat and voice channels for enterprise CX teams. Retell benchmarked a 78% resolution rate vs Decagon's 47% in head-to-head testing, indicating direct competitive overlap in enterprise voice/chat support automation.
- Sierra: Sierra builds AI agents for enterprise customer experience, including voice, and competes with Retell for large enterprise CX deals. It is listed alongside Decagon and others as a direct voice AI comparison on Retell's website.
- Thoughtly: Thoughtly is a voice AI agent platform targeted at contact center and sales use cases with a self-serve product-led growth motion. It competes directly with Retell's SMB and mid-market positioning.
Emerging players
- PolyAI: PolyAI develops enterprise conversational voice assistants for customer service and is an emerging player in the voice AI agent space with comparable enterprise call center use cases.
- Voiceflow: Voiceflow is a conversational AI design and orchestration platform used to build voice and chat agents. It overlaps with Retell's developer/builder motion for designing AI agent flows.
Broad incumbents
- Amazon Connect: Amazon Connect is AWS's cloud contact center service that increasingly bundles AI voice agent capabilities via Amazon Lex and Bedrock. It competes with Retell at the platform/CCaaS layer and is one of Retell's own integration partners, representing both partner and competitor dynamics.
- Five9: Five9 is a major CCaaS incumbent that has been adding GenAI voice agent capabilities to its contact center platform. It competes with Retell for enterprise CX automation budgets and is also an integration partner.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Retell AI social profiles
Digital presenceRetell AI compliance and trust
Trust signalCompliance4 records
Retell AI financial estimates
Financial estimateRevenue estimate
Valuation estimate
Retell AI leadership team
Management profileNumber of profiles
Profiles1 record
Retell AI funding detail
Funding detailFunding overview
Funding rounds2 records
Investors3 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Retell AI M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Retell AI
What does Retell AI do?
Retell AI provides an LLM-based AI voice agent platform that enables businesses to build, test, deploy, and monitor AI agents for automating inbound and outbound phone calls. The platform is designed for call center automation across verticals including healthcare, financial services, insurance, home services, debt collection, logistics, retail, and travel, offering voice AI with sub-second latency and telephony-native architecture.
Is Retell AI a public or private company?
Retell AI is a private company. It is classified as venture growth investor backed and is currently operating.
When was Retell AI founded?
Retell AI was founded in 2024. It employs 101 to 250 people.
Where is Retell AI based?
Retell AI is headquartered in Redwood City, United States, in the North America region.
How does Retell AI make money?
Four revenue lines are on record. Usage-based Voice AI minutes are the primary driver. The others are recurring subscriptions for telephony, knowledge, and concurrency, freemium / Free Trial and enterprise professional services and on-prem.
Who are Retell AI's main competitors?
Direct peers on record are Vapi, Bland AI, Synthflow, Decagon, Sierra and Thoughtly. Emerging players are PolyAI and Voiceflow. Broad incumbents are Amazon Connect and Five9.
Does Retell AI have an API?
Yes. Retell AI exposes a versatile REST API and webhooks that allow developers to build call operation AI agents, provision numbers, handle calls, and integrate the platform into custom workflows. The platform offers SDKs (including a JavaScript web client SDK — retell-client-js-sdk) and is LLM-agnostic, allowing customers to plug in their own LLMs (GPT, Claude, Gemini, open-source, or custom fine-tunes) via a Custom LLM interface. Webhooks (e.g., Retell Webhook Secret Key) enable event-driven integration with systems such as HubSpot. The API supports voice, chat, SMS, and web call channels. An MCP (Model Context Protocol) server is also available for AI assistants. Developer documentation is at docs.retellai.com/general/introduction.
What industry is Retell AI in?
Retell AI's product category is Conversational AI / Voice AI Platform. Its primary akta.pro industry code is HDAAAFAL, Contact Center Speech AI (agent assist, IVR automation), with a secondary code of HDAAAFAC, Conversational AI Platforms (chat/voice bots, orchestration). Its NAICS code is 56142 and its SIC code is 7370.