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Retell AI

Retell AI

AI-Native
Best output quality
Most customizable

AI voice agent platform for phone call centers

SOC 2
GDPR
HIPAA
EU AI Act: Limited
Public status page
+9
Autonomous
Last updated: Aug 28, 2026
Paid
Visit Site
More
retellai.com
Retell AI screenshot 1
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Quick Answer

AI

Retell AI is an AI voice agent platform for phone call centers, enabling businesses to automate inbound and outbound calls with human-like conversational AI. It boasts industry-leading ~600ms latency and integrates with major telephony and CRM systems like Twilio and HubSpot. Best for mid-market and enterprise call centers seeking to streamline operations and enhance customer service at scale. Free usage credits are available, with pay-as-you-go and custom enterprise pricing.

About Retell AIAI

Retell AI is an AI voice agent platform for phone call centers that enables businesses to automate inbound and outbound calls with human-like conversational AI. It features ultra-realistic voices, low-latency responses, and real-time function calling for tasks like booking appointments and updating records.

AI-extracted from public sources. May contain errors. Methodology · Report an error
What Makes Retell AI UniqueAI

Retell AI offers proprietary voice AI orchestration with ~600ms latency and ultra-realistic voices, combined with a highly configurable agentic framework for complex call flows and real-time function calling. It also provides enterprise on-premise deployment for strict security and data residency.

Decision Intelligence

Best For

AI
Mid-market and enterprise call centers automating high-volume customer interactions
Healthcare providers streamlining patient scheduling and inquiries
Financial services firms enhancing customer support and lead qualification
Logistics companies managing dispatch services and customer communication
Retail and consumer goods businesses scaling customer service operations

Consider Alternatives If

AI
Individuals or very small businesses with minimal call volume needs
Organizations requiring a visual agent builder without any coding or API interaction
Companies that cannot tolerate any usage-based billing components
Pricing Overview

Type

Paid

Starting Price

$0/mo

Free Trial

Yes

Credit Card

Not Required

Free Plan

Yes

Dimension Scores

· 7.5 avg

How good it is, across universal quality axes

Ease of Use7/10
Output Quality8/10
Value for Money7/10
Customization7/10
Support7/10
Integration8/10
Accuracy & Reliability8/10
Compliance & Data Protection7/10
Performance8/10
Task Completion8/10
Tool Use Correctness8/10
Planning Quality7/10
AI-analyzed from product data·Medium confidenceHow we score

Task Scores

· 7.6 avg

What it can do, on category-specific tasks

Latency Ttft9/10
Voice Naturalness9/10
Speech Recognition Accuracy8/10
Turn Taking8/10
Call Routing Transfer8/10
Crm Integration8/10
Interruption Handling7/10
Context Retention7/10
Multilingual Support7/10
Emotion Detection5/10

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Capabilities
Voice
Automation
Chat
Memory
RAG
Data Analysis
Scheduling
Speech-to-Text
Categories
Voice Agents
Customer Support
Automation Agents
ProsAI
  • +Lowest latency (~600ms) for smooth and fluent conversations
  • +Ultra-realistic voices built from real performance data
  • +Proprietary turn-taking model for natural interactions
  • +Highly configurable agentic framework with drag-and-drop flow builder
  • +Real-time function calling for dynamic task execution
  • +Streaming RAG for accurate, real-time answers from knowledge bases
LimitationsAI
  • -Billing continues during silence or hold time as speech-to-text engine remains active
  • -Specific data export formats are not explicitly detailed
  • -No explicit mention of specific LLM fine-tuning capabilities beyond general model training
  • -No explicit mention of specific SDK languages beyond API access
  • -No explicit mention of specific OAuth providers
Integrations & Connections
30 connections
R
D
H
+26
Dataiku
Dataiku

The Platform for AI Success

HubSpot
HubSpot

The HubSpot Customer Platform — software & tools for your business

MA
MakeNative

Connect Retell AI to Make for workflow automation.

TW
TwilioNative

Integrate with Twilio for telephony features and call management.

VO
VonageNative

Connect with Vonage for inbound and outbound call handling.

GO
Go High LevelNative

Integrate with Go High Level for CRM and marketing automation.

N8
N8nNative

Connect Retell AI to n8n for workflow automation.

ZA
ZapierZapier

Connect Retell AI to Zapier for workflow automation.

Auto-updated

Build a Stack
Fit Score

Complexity

Advanced

Company Size

Small
Medium
Enterprise

Team Size

Small Team
Large Team

Skill Level

Expert
Features
Call transfer between human and AI
Appointment booking and availability checking
Knowledge base integration for real-time answers
IVR navigation for keypad menus
Batch calling for high-volume campaigns
Branded caller ID for outbound calls
Verified phone numbers to prevent spam flags
Post-call analysis for performance insights
Technical Capabilities
SDK Available
MCP Compatible
Multi-Agent
Human-in-Loop
Can Use Tools (unknown)
Team Features
Webhook Support
Has Demo
Function Calling
Sandbox Mode
Audit Logs
No Signup (unknown)
Works Offline
Requires Host App
Framework
MCP Server
Digital Employee

Deployment

Cloud
Authentication
Single Sign-On
Developer Access
API
Public
→ Docs
Webhooks
Sandbox
Public
→ Try sandbox
HITL mode:
Approve
Compliance, Privacy & Trust
GDPR (as claimed): Yes
SOC 2 (as claimed): Yes
Type II
HIPAA (as claimed): Yes
Trains on user data: Unknown
PII handling: Auto Redacted
Model isolation: Shared

Region restricted in:

Cuba
Iran
North Korea
Syria
Russia
Belarus
Venezuela
Human review:
Recommended

Compliance audit trail

2 events
  1. Subprocessors

    Vendor Sub-processor Update: Retell AI Adds Sentry and AssemblyAI

    1mo ago · 2026-07-22 · source

  2. Subprocessors

    Vendor Sub-processor Update: Retell AI Adds Soniox and Ironclad

    3mo ago · 2026-05-28 · source

Tech Specs
Max upload: 50MB
Response time (est.):
Fast

The Model(s) Behind It

Model details — extracted from public vendor sources by our pipeline (Smart Generator + A3 cross-referencing) or admin-entered. Shown as claimed by the vendor; not independently audited by Intelloro.

Powered By
Model Weight Availability
Closed API (no weights)
Training Data Provenance
Not disclosed
Relevant to EU AI Act Art. 53 / Annex XI (GPAI)
Supported Tools
Call Transfer
Book Appointments
Knowledge Base
Navigate IVR
Batch Call
Branded Call ID
Verified Phone Numbers
Post Call Analysis
AI Quality Assurance
Real-Time Function Calling
Free tier available
Free
Free
    Pay-as-you-go
    $0.07/usage-based
    Free trial · no card needed
    • Full Platform Access
    • Pre-built Agent Templates
    • Call Analytics and Transcripts
    • Simulation Testing
    • Webhooks and API Access
    • 20 Free Concurrent Calls
    • Community and Email Support
    Enterprise Plan
    Custom
    • Dedicated Implementation Support (add-on)
    • Custom MSA/DPA terms
    • Role-based Access Control
    • Dedicated Stable Server
    • Custom SSO
    • High Cap on Concurrent Calls
    • 24/7 Omnichannel Support with Dedicated Portal

    Pricing verified from the vendor pricing page.

    Alternatives

    Top Retell AI alternatives in the same category, ranked by quality.

    Bland AI

    Bland AI

    paid

    Enterprise voice AI platform for phone agents

    Synthflow AI

    Synthflow AI

    freemium

    Enterprise-ready voice AI agents for automated phone calls

    VoiceGenie

    VoiceGenie

    freemium

    Voice AI agents that sound human — sales & support automation

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    Who It's For
    1 roles
    Customer Service Representatives
    Platform, Content & Languages
    4 content types
    1 languages
    TextAudioChatbotEnglish+7 more

    Output Languages

    English

    Content Types

    Text
    Audio
    Chatbot
    Social Media

    Publishes to

    Instagram
    X
    YouTube
    LinkedIn

    Accepts

    Audio
    Text
    API

    Produces

    Audio
    Text
    API
    Languages: English

    Frequently Asked Questions

    Video

    Trust Score

    90/100

    Excellent

    Based on 14 data signals

    Confidence: Medium

    Reflects publicly available data, not an independent audit

    Compliance & Verified28/38
    GDPRYes
    SOC 2Yes
    HIPAAYes
    EU AI ActYes
    Human ReviewYes
    Human-in-the-loopYes
    HITL TypeYes
    Operational35/35
    Uptime (measured)99.99%
    Status PageYes
    Data ResidencyUS
    Market Proof10/10
    Notable CustomersPine Park Health, SWTCH, Medical Data Systems
    Company17/17
    Company ListedYes
    User Base50M-100M
    FundingSeed
    Health—

    Not yet checked

    AI-Assisted Data

    Some details are AI-generated estimates — verify with the vendor.

    AI-generated estimate: Best For, Description, Limitations, Not Good For, Pros, Quick Answer, What Makes Unique

    How we source data

    AI Governance & Regulatory Disclosures

    Legally-sensitive fields — extracted from public vendor sources by our pipeline (Smart Generator + A3 cross-referencing) or admin-entered. Shown as claimed by the vendor; not independently audited by Intelloro.

    EU AI Act Risk Tier
    Limited (Article 50 transparency)
    EU AI Act Article 50 Disclosure
    Not declared
    COPPA Compliance (US under-13)
    Not declared
    Subprocessor List (GDPR Art. 28)
    https://trust.retellai.com/subprocessors

    Switching & Migration

    Migration Difficulty
    Moderate Effort
    Data portable as:
    JSON

    Community and Email

    API Access
    Quick Stats
    Agent TypeAutonomous
    MemoryLong Term
    PlanningAdvanced
    CategoryVoice Agents
    Base ModelGPT-5.5 +23
    PlatformsWeb, API
    User Base50M-100M
    Launched2023
    Setup TimeWEEKS
    Company & Links

    Company Name

    Retell AI Inc.

    Founded

    2023

    Based in

    United States

    Last major update

    Jul 2026

    Funding

    Seed · $5M

    DocumentationChangelog
    LinkedInTwitter/XDiscordYouTube