Fude (筆)
Checks your Japanese and converts keigo as you type.
Three politeness levels, tuned for business writing.
Features
AI Grammar Check
Detect and fix grammar errors and unnatural expressions.
3-Level Keigo Conversion
Convert to casual, business keigo, or the most formal register.
Real-time Proofreading
Get suggestions as you type. Works on Gmail, Slack, Notion, etc.
Offline Local Rules
50+ rules for double keigo, ra-nuki, and more — no internet connection needed.
Pricing
Free
Free forever. No account required.
- 10 AI corrections per day
- 3-level keigo conversion
- 50+ offline local rules
- Gmail, Slack, Notion support
Pro
Billed monthly. Cancel anytime.
- Everything in Free
- Unlimited AI corrections
- High-accuracy model (Claude)
- Custom dictionary
- Priority support
Cancel anytime from your customer portal.
FAQ
What's the difference between Free and Pro?
Free gives you 10 AI corrections a day. Pro removes the limit and uses a higher-accuracy model.
Which sites does it work on?
Gmail, Slack, Notion, Google Docs, and any site with text input.
Does it work offline?
Local rules (double keigo, ra-nuki, etc.) work offline.
Is my data collected?
No, we don't collect personal data. Privacy Policy