ISSEN vs OpenAI Realtime API

Comparing the features of ISSEN to OpenAI Realtime API

Feature
ISSEN
OpenAI Realtime API

Capability Features

Custom Curriculum
Dialect and Style Options
Japanese - Tokyo - FormalSpanish - Mexico City - SlangFrench (FR) - Paris - Standard
Enterprise Privacy Commitment
Expanded Model Support Planned
Five New Voices
5
Flexible Lesson Structure
Function Calling
Grammar Lessons
Human and Automated Safety Monitoring
Interruption Handling
Multiple Tutor Personalities
SakuraSantiagoCéleste
No Judgment
No Training on Data Without Permission
Personalized Lessons
Playground Access
Prompt Caching Planned
Public Beta
Realtime Voice Tutor
Reference Client Available
Shadowing and Translation Drills
Six Preset Voices
6
Speech-to-Speech
Streaming Audio Inputs/Outputs
Supported Language List
AfrikaansArabicArmenianAzerbaijaniBelarusianBosnianBulgarianCantoneseCatalanCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIcelandicIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMandarin ChineseMaoriMarathiNepaliNorwegianPersianPolishPortugueseRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilThaiTurkishUkrainianUrduVietnameseWelsh
Supports Text and Audio Inputs
TextAudio
Tutor Customization
Ultra Low Latency
WebSocket Connection

Integration Features

Agora Integration
Chat Completions API Integration
LiveKit Integration
Mobile App Integration
Play storeApp store
OpenAI Node.js SDK Planned
OpenAI Python SDK Planned
Supports GPT-4o
gpt-4o-realtime-preview
Twilio Voice API Integration
Web-Based Platform

Limitation Features

AI Disclosure Requirement
Audio Only Modality (Initially)
Lower Session Limits Tiers 1-4
Lower than 100
No Human Teachers
No Simultaneous Session Limit Anymore
Not Completely Free
Simultaneous Sessions Limit Tier 5
100
Usage Policy Restriction

Pricing Features

Approximate Audio Input Price
$0.06/minute
Approximate Audio Output Price
$0.24/minute
Cancel Anytime
Free Tier
Free Trial Duration
10
Monthly Payment
No Free Tier
Pricing Audio Input
$100/1M tokens
Pricing Audio Output
$200/1M tokens
Pricing Cached Audio Input
$20/1M tokens
Pricing Cached Text Input
$2.50/1M tokens
Pricing Range
$20-$29/month
Pricing Text Input
$5/1M tokens
Pricing Text Output
$20/1M tokens