Your complete Japanese writing system

Paste or type Japanese, get instant corrections with grammar explanations, score, and JLPT calibration. Works in Gmail, Slack, Notion, anywhere.

See corrections appear token by token as the AI thinks. No waiting, no spinner — just live feedback.

Set your target level (N5–N1). Corrections are calibrated to your exact level — not too easy, not overwhelming.

Every correction comes with a 'Why?' — a clear explanation in plain English with the grammar rule name.

Daily streak counter with personal best. Smart notifications keep you on track without being annoying.

Save words from corrections to your personal vocab list. Free plan includes 30 words with full SRS review access.

Look up any word directly in the popup — readings, JLPT level, all meanings, extra senses — instantly.

SM-2 algorithm schedules vocab reviews at the perfect moment. Due count badge on the extension icon.

AI analyzes your full correction history and identifies your top recurring error patterns with targeted drill exercises.

5 immersive scenes: job interview, restaurant, shopping, formal keigo, casual chat. AI stays in character, corrects mistakes mid-scene.

Hover over any Japanese word on any webpage for instant definitions, readings, and JLPT level — no copy-paste needed.

Right-click any selected text to save it with full context to your vocab list. Review the real sentence you saw it in.

Opt in to compete with other learners globally. Weekly XP rankings, public profile, sharable progress.

Organize saved words into themed decks. Make decks public with a shareable link — share your study sets with friends.

Personalized coaching text based on your mistake patterns + 3 custom practice sentences generated just for you.

Visual bar chart showing how many grammar patterns you've practiced at each JLPT level.

Write what you want to say in English. Get two natural Japanese drafts — casual and polite — instantly.

See how a native speaker would express your exact idea. Goes beyond correction to true naturalness.

Save unlimited words. No 30-word cap. Your entire vocabulary, organized, reviewed, yours.

Practice open-ended Japanese conversation with an AI that corrects you mid-chat and explains grammar notes.

Export your entire vocab list as an Anki-importable TSV file. One click, works with any Anki deck.

Create a classroom with an invite code. Students join and you see aggregate progress — who reviewed, who's lagging, JLPT coverage by student.

Daily AI-generated writing challenges with a grammar pattern target, example, hint, and native model answer.