Perfect YourJapanese Writing
Our Chrome extension instantly detects grammar errors, suggests proper formality levels, and helps you write natural Japanese for any situation.
Works everywhere you write
Built for the moments that matter
Whether you're job hunting, studying for JLPT, or navigating daily life in Japan — Kunkun has your back.
Nail your job application
One politeness mistake on an エントリーシート can cost you the interview.
- Catches keigo errors in cover letters and ES
- Flags formality mismatches before they reach a recruiter
- Explains exactly why the phrasing is wrong
Study smarter for JLPT
Practice writing and get instant feedback — N5 through N1.
- Catches tense errors (〜ます vs 〜ました)
- Flags particle mistakes like で vs に
- Learn why each correction is made, not just what
Write to your landlord with confidence
Rental inquiries, neighbor messages, utility forms — formal Japanese matters.
- Catches どうか vs どうぞ and similar keigo slips
- Detects tense and particle errors in formal requests
- Makes your Japanese sound like a native resident
Ready to see the difference Kunkun can make in your Japanese writing?
Get Started FreeType or paste Japanese anywhere — Kunkun checks it as you write and explains every correction.
Grammar Correction
Instantly catch particles, verb conjugations, and structural errors in your Japanese writing.
Formality Adjustments
Choose the right level of formality for emails, business documents, or casual conversations.
Natural Rewriting
Get smart suggestions to make your Japanese sound more natural and native-like.
Powerful features that make your Japanese writing better, faster.
Customize Your Experience
Set your politeness level, writing context, and writer mode. Kunkun adapts to whether you're writing business emails, casual messages, or academic papers.
- Set politeness level: casual, polite, or formal
- Choose writing context: business, academic, or casual chat
- Switch between Learner and Native writer modes
Track Your Progress
Review your grammar checks over the last 90 days. See what errors you make most and watch your writing improve over time.
- Browse every check from the last 90 days
- Filter by error type to spot patterns in your mistakes
- Re-check any past text with one click
Check Multiple Texts at Once
Paste up to 20 texts and check them all in one go. Perfect for reviewing a batch of emails or documents before sending.
- Results appear in seconds — no waiting
- See a per-text error count at a glance
- Ideal for proofreading a set of emails before sending
Works Where You Write
The Chrome extension checks your Japanese in real-time on any website — Gmail, Notion, LinkedIn, and more. The Google Docs add-on gives you a dedicated sidebar for longer documents.
- Dedicated panels for Gmail and Notion
- Works on LinkedIn, Twitter, Reddit, ChatGPT, and any text field
- The Google Docs add-on adds a full sidebar for longer documents
Have questions?
Installation, browsers, pricing, privacy, and more — answered in our FAQ.
View all FAQsFree during beta. When paid plans launch, beta users get first access and a discount.
Free
During Beta
$0/ mo
- Unlimited grammar checks
- Advanced politeness detection
- Context-aware suggestions
- Google Workspace integration
- JLPT N5–N1 aligned suggestions
- Real-time checking as you type
Start writing better Japanese todayFree during beta
All features included. No credit card needed.
Get Started For FreeQuestions? Contact us