ISSEN is a personal AI language tutor app offering web, iOS, and Android versions with a free 20-minute trial and subscription priced at $20–29/month.
It uses a custom voice AI pipeline combining speech-to-text (Gemini Flash, Whisper, Scribe, GPT-4o-transcribe), text-to-speech, large language models, long-term memory, and SRS flashcards (FSRS).
Targeting intermediate to advanced learners, it provides full spoken conversations, custom curricula based on goals and interests, and a word bank with spaced repetition flashcards.
User feedback highlights struggles for beginners due to lack of structured lesson plans, overly long replies, missing corrections, and insufficient translation or romanization support.
Suggestions include adding guided lesson structure, click-to-translate text, pronunciation feedback, hold-to-talk control, exporting flashcards to Anki, and incorporation of current news topics.
Privacy policy stores text sessions and summaries but not audio, with user data removable upon account deletion.
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