Retell AI vs WhisperUI

Comparing the features of Retell AI to WhisperUI

Feature
Retell AI
WhisperUI

Capability Features

Agent Builder
Agent Testing
API Access
Appointment Scheduling
Auto-Sync Knowledge Base
Automatic Scalability
Millions of concurrent calls
Batch Calls
Batch File Upload
Branded Caller ID
Call History
Call Monitoring
Call Transfer Options
Desktop Version
Drag & Drop Upload
Edge Case Handling
Edit Transcription
Export SRT Subtitles
Fast Transcription Speed
Most files within a few minutes
File Browse Upload
Global Reach
High Accuracy Model
High (depends on audio quality)
Industry Compliance
SOC 2 Type 1&2HIPAAGDPR
LLM-Powered
Low Latency
500ms latency
Multi-language Support
18+ languages
Multi-Language Transcription
Multiple Deployment Channels
AI phone callsWeb callsSMSChat
Natural Language Conversations
Navigate Through IVR
No Concurrency Limits
Platform Uptime
99.99% uptime
Speech to Text
Supported Language List
EnglishSpanishFrenchGermanChineseand more
Text to Speech
Translation to English
Unlimited Daily Uploads
Verified Phone Numbers
Voicemail Detection

Integration Features

CRM/Automation Integrations
Cal.comn8nGoHighLevelTwilioVonageOpenAI
Integrates with Any CRM
Integrates with Any Telephony
Integrates with Automation Platforms
Integrates with Databases
Supported Audio Types
mp3mp4mpegmpgam4awavoggwebm
Telephony Integration
TwilioVonageTelnyxPlivoRingCentral

Limitation Features

File Size Limit
25
No Desktop App Mentioned
No Internal Billing
No Mentioned Self-hosting
No Public Pricing Listed
OpenAI API Key Required
Web App Only

Other Features

API Key Stored Locally

Pricing Features

Direct API Usage Billing
OpenAI API usage billing
Free Tier
Has Free Tier
Premium Plan Features
Upload multiple files at onceUnlimited daily files uploadTransform audio files into SRT files
Pricing Plan Details