ISSEN vs Sesame

Comparing the features of ISSEN to Sesame

Feature
ISSEN
Sesame

Capability Features

Consistent Personality
Context Awareness
Conversational Dynamics
Conversational Speech Generation
Custom Curriculum
Dataset Size
1 million hours
Dialect and Style Options
Japanese - Tokyo - FormalSpanish - Mexico City - SlangFrench (FR) - Paris - Standard
Emotional Intelligence
Evaluation Suite
Flexible Lesson Structure
Grammar Lessons
Model Sizes
Tiny: 1B backbone, 100M decoderSmall: 3B backbone, 250M decoderMedium: 8B backbone, 300M decoder
Multiple Speaker Handling
Multiple Tutor Personalities
SakuraSantiagoCéleste
No Judgment
Objective Metrics
Word Error RateSpeaker SimilarityHomograph DisambiguationPronunciation Consistency
Partial Multilingual Support Planned
Planned for 20+ languages
Personalized Lessons
Pronunciation Correction
Realtime Voice Tutor
Sequence Length
2048
Shadowing and Translation Drills
Single-Stage Model
Subjective Metrics
Comparative Mean Opinion Score
Supported Language List
AfrikaansArabicArmenianAzerbaijaniBelarusianBosnianBulgarianCantoneseCatalanCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIcelandicIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMandarin ChineseMaoriMarathiNepaliNorwegianPersianPolishPortugueseRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilThaiTurkishUkrainianUrduVietnameseWelsh
Text and Audio Input
TextAudio
Training Epochs
5
Tutor Customization

Integration Features

GitHub Release
LLama Architecture Backbone
Mimi Split-RVQ Tokenizer
Mobile App Integration
Play storeApp store
Web-Based Platform

Limitation Features

Cannot Model Conversation Structure
English Language Dominance
Memory Bottleneck in Training
No Human Teachers
No Pre-trained Language Model Use
Not Completely Free
Real-Time Generation Delay
RVQ time-to-first-audio scales poorly

Pricing Features

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Free Preview
Free Tier
Free Trial Duration
10
Monthly Payment
Open Source
Apache 2.0
Pricing Range
$20-$29/month