Kunkun brings advanced Japanese grammar checking directly into your Google Workspace™ apps. Whether you’re writing a business email, preparing for JLPT, drafting a job application, or composing a message to your landlord, Kunkun catches errors and suggests improvements in real time.

Features:

· Grammar error detection with plain-language explanations
· Keigo: 尊敬語/謙譲語 mix-ups, 二重敬語, さ入れ・ら抜き言葉, させていただく overuse
· Politeness level: casual, polite and formal — including whether a document stays consistent with itself
· Polish: rewrite a passage at the politeness level you want, in one click
· Checks documents up to 50,000 characters
· Learner and Native Writer modes, which change what it looks for
· JLPT levels N5–N1 on the grammar points where one applies (Learner mode)
· Your recurring mistakes tracked on kunkun.io, with the one pattern to practice next
· Full English/Japanese UI

Works in Google Docs™, Google Slides™, and Google Sheets™. Free during beta — no credit card required.

Google Docs™, Google Slides™, and Google Sheets™ are trademarks of Google LLC.