About 2hongo
A comprehensive Japanese learning companion — combining the depth of a dictionary with the intelligence of an AI-powered learning system.
Our Mission
To provide Japanese learners — from early stages through advanced proficiency — with the most comprehensive, context-rich dictionary and learning platform available. We believe effective language learning requires more than isolated definitions. It demands real-world context, systematic review, and instant access to the reference materials learners need at every stage of their journey.
What We Offer
Everything you need to build, retain, and deepen your Japanese vocabulary — in one place.
Comprehensive Dictionary
214,000+ entries with contextual example sentences, pitch accent, audio pronunciation, word relationships, and JLPT classifications.
AI Meaning Search
Describe a concept in English, Chinese, or Japanese and get matching Japanese words back — semantic search that finds words by meaning, not spelling.
Structured Learning
55+ learning pages covering writing systems, verb conjugation, essential vocabulary, and quick-reference tables — all fully localized.
Stroke Practice
Animated stroke order playback and freehand drawing practice with real-time validation for hiragana, katakana, and kanji.
Curated Vocabulary
Thematic and JLPT-leveled word lists with filtering, sorting, and direct integration into your personal notebooks.
Grammar Reference
470+ grammar patterns organized by JLPT level, each with formation rules, examples with interactive tokenization, and related content.
Reading Articles
JLPT-leveled stories, conversations, and cultural pieces rendered as interactive text — every word is clickable, grammar patterns are auto-highlighted, and paragraphs have natural audio narration.
Notebook
Save words into your own notebooks, organize them with tags, mastery levels, and personal notes, and file a single word into multiple notebooks at once.
Spaced Repetition
An SM-2 spaced-repetition system spanning saved words, kana, kanji, and grammar — swipeable flashcards that adapt to your recall and keep every strand of study on schedule.
Sensei AI
An AI tutor that answers questions about the exact word, grammar pattern, or article you are viewing, plus a short personalized study plan: your reviews, the next grammar pattern, and a level-matched article. Available on the web and in our mobile apps.
ChatGPT & Claude
Use the 2hongo teaching plugin in ChatGPT or Claude for Japanese explanations, sentence corrections, and practice without connecting a 2hongo account. Connect for dictionary entries, grammar lessons, and your study record. Sensei AI is the tutor built into our web and mobile apps.
AI assistant setup guideLanguage Tools
Text parser, full-width / half-width converter, kana converter, and Japanese era converter — handy utilities for daily study.
Our Story
2hongo was born from a simple frustration: existing Japanese learning tools lack depth. Traditional dictionaries give definitions without context. Flashcard apps offer review without reference. Grammar sites explain rules without vocabulary integration. Learners are forced to juggle multiple apps and websites, creating a fragmented, disjointed experience.
We set out to build something different — a unified platform where looking up a word leads naturally into understanding its grammar, practicing its writing, and adding it to a personalized review schedule. Every feature connects to every other, so learning flows instead of fragmenting.
With one of the largest Japanese-English/Chinese dictionaries available, 2hongo combines breadth with depth — contextual example sentences, interactive tokenization, grammar detection, and stroke validation — to create a learning experience that complements textbooks, courses, and classroom instruction.
Built for Global Learners
Language learning shouldn't be limited by which language you speak. 2hongo is fully localized in English, Chinese (Simplified & Traditional), and Japanese — not just translated UI, but culturally appropriate content and professionally translated learning materials throughout.
What's Free
Everything you can read on 2hongo is free at every level: the dictionary, grammar lessons, kanji and vocabulary pages, articles, learning pages, and the language tools. A free account adds a notebook with spaced-repetition review, a personal Sensei study plan, and the full study tools for kana and JLPT N5. Standard unlocks quizzes, progress tracking, stroke practice, and audio for N4 through N1. Plus and Max add a full allowance of Sensei AI chat and personalized help in your AI assistant.