About
NihonFlow
Japanese language learning platform
NihonFlow is a bootstrapped Japanese language learning platform built around a Claude-powered AI tutor. It provides contextual grammar explanations, vocabulary help, personalized feedback, interactive practice, a structured 946-day learning course, email lessons, and TTS-generated audio.
Live now. Anyone can sign up and start with 90 free lessons.
What NihonFlow does
One lesson a day, from first words to real conversation.
A 946-day course
78 themed arcs across 6 stages, from first greetings to professional Japanese. One new lesson a day.
Daily email lessons
Each lesson arrives by email at the time the learner chooses, then opens in the app.
Interactive practice
Dictation, building sentences from tiles, typed answers, listening questions, and saying the line aloud.
Spaced review
Words and grammar come back on a spaced-repetition schedule, and missed items return until they stick.
AI Sensei
A tutor powered by Claude inside every lesson, for questions, corrections, and extra practice.
Lesson audio
Natural-speed and slow audio for lesson sentences, generated with ElevenLabs text-to-speech.
AI Sensei
AI Tutor powered by Claude
AI Sensei, NihonFlow’s tutor, is built on Claude, the AI model made by Anthropic. Learners open it from any lesson. Sensei already knows which lesson they are on and how they read Japanese, so every answer starts from what they have just studied.
Sensei stays focused on learning Japanese. It never changes a learner’s progress or account.
What Claude does in NihonFlow
Grammar explanations
Explains the grammar in the current lesson, or in any Japanese sentence a learner asks about, with examples at their level.
Vocabulary guidance
Meanings, nuance, and readings, plus the ways to say something from formal to casual.
Personalized learner feedback
Learners write their own Japanese. Sensei corrects it gently and explains each correction.
Interactive Japanese practice
Quizzes with tap-to-answer choices, quick drills, and short roleplays when a learner asks for them.
Adaptive conversation practicePlanned
Conversation practice that adapts to each learner’s level.
Who builds it
Built in Tokyo by an independent founder.
NihonFlow is an independent, self-funded software business. It is designed, built, and run by its founder, Ahmed Baraa Fadhloun, in Tokyo, Japan. It started in 2026 and has no outside investors.