Retell AI vs ISSEN

Comparing the features of Retell AI to ISSEN

Feature
Retell AI
ISSEN

Capability Features

Agent Builder
Agent Testing
API Access
Appointment Scheduling
Auto-Sync Knowledge Base
Automatic Scalability
Millions of concurrent calls
Batch Calls
Branded Caller ID
Call History
Call Monitoring
Call Transfer Options
Custom Curriculum
Dialect and Style Options
Japanese - Tokyo - FormalSpanish - Mexico City - SlangFrench (FR) - Paris - Standard
Edge Case Handling
Flexible Lesson Structure
Global Reach
Grammar Lessons
Industry Compliance
SOC 2 Type 1&2HIPAAGDPR
LLM-Powered
Low Latency
500ms latency
Multi-language Support
18+ languages
Multiple Deployment Channels
AI phone callsWeb callsSMSChat
Multiple Tutor Personalities
SakuraSantiagoCéleste
Natural Language Conversations
Navigate Through IVR
No Concurrency Limits
No Judgment
Personalized Lessons
Platform Uptime
99.99% uptime
Realtime Voice Tutor
Shadowing and Translation Drills
Supported Language List
AfrikaansArabicArmenianAzerbaijaniBelarusianBosnianBulgarianCantoneseCatalanCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIcelandicIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMandarin ChineseMaoriMarathiNepaliNorwegianPersianPolishPortugueseRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilThaiTurkishUkrainianUrduVietnameseWelsh
Tutor Customization
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
Mobile App Integration
Play storeApp store
Telephony Integration
TwilioVonageTelnyxPlivoRingCentral
Web-Based Platform

Limitation Features

No Desktop App Mentioned
No Human Teachers
No Mentioned Self-hosting
No Public Pricing Listed
Not Completely Free

Pricing Features

Cancel Anytime
Free Tier
Free Trial Duration
10
Monthly Payment
Pricing Plan Details
Pricing Range
$20-$29/month