Kunkun

Checks Japanese grammar and suggests improvements.

Kunkun checks your Japanese grammar in real time, directly in your browser — no copy-pasting into a separate tool. It works inside Gmail, Notion, and most text fields on any site. For Google Docs, Sheets and Slides there's a companion Workspace add-on with a full sidebar. WHAT IT CHECKS • Grammar errors and unnatural phrasing • Keigo (polite/formal Japanese) — is your level right for the situation? • Formality — too casual for a business email? Too stiff for a friend? • Redundant phrasing that can be tightened • Rewriting a sentence to the politeness level you meant WHO IT'S FOR • JLPT studiers (N5–N1) practicing written Japanese • Job seekers writing 就活 emails and cover letters • Professionals sending business emails in Japanese • Anyone writing Japanese who wants a second opinion before hitting send FEATURES • Real-time checking as you type • Explanations in English or Japanese, your choice • Dedicated panels for Gmail and Notion; works in any standard text field • Set your politeness level, writing context, and learner or native-speaker mode • JLPT mode highlights grammar at the level you're studying • Insights: the mistake you repeat most, and the rule behind it • A Practice page for checking several passages at once Free during beta — no credit card. A free account is required. Questions or feedback: support@kunkun.io