Keigo & business Japanese checker for non-natives in Japan. Fixes keigo & grammar mistakes in Gmail, Slack & Docs as you type.
Users
16
+1 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#163K
#136K among extensions
Version
1.5.0
updated 9 Sep 2026
Users
monthly, 8 months
Latest, 15 Oct 2026:16 usersMove the mouse over the chart for any month
Ratings count
monthly, 8 months
Latest, 15 Oct 2026:0 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Keigo & Business Japanese Corrector - Japanese Grammar Checker AI - Fude
Reporting to your manager, emailing a client, posting in the team Slack — Fude fixes your keigo mistakes before you hit send.
Fude (筆) is a keigo (Japanese honorifics) and business Japanese checker for non-native speakers who work in Japanese. It runs right where you already write: Gmail, Slack, Notion, Google Docs and more.
「拝見させていただきました」「弊社がご説明なさいます」「了解しました」— mistakes that are hard to notice yourself get underlined as you type, with the reason and the correct phrasing explained in your language.
★ WHAT FUDE DOES ★
✓ Checks for the right reader
• Switch the audience between Internal (coworkers) and External (clients) and the same sentence is judged differently
• 「拝見させていただきました」 in the team Slack is flagged as over-polite; 「送ります」 to a client is flagged as not polite enough
• 3 keigo levels: Casual / Business / Ultra-formal
✓ Fixes keigo mistakes on the spot
• Double keigo (拝見させていただく, おっしゃられる)
• Mixing up respectful and humble forms (弊社がご説明なさいます)
• Set phrases that are wrong at work (了解しました, ご苦労様です)
• Particles, Japanese grammar and typos are checked at the same time
✓ Write plainly, convert to keigo (Pro)
• Type 「明日の会議、資料を送って」, select it, right-click → a business sentence that fits your audience and keigo level
✓ Works where you already write
• Gmail, Slack, Notion, Google Docs and other web editors
• Text fields on any page are detected automatically
✓ Explanations in your language
• English, 日本語, 中文, 한국어, Español, Português
★ WHO IS FUDE FOR? ★
• Non-native employees at Japanese companies
• Anyone unsure whether the keigo in their email to a client is right
• Anyone worried about sounding rude to a manager or senior coworker on Slack
• Anyone who wants Japanese grammar proofreading along with their keigo
★ FREE vs PRO ★
FREE: 20 AI corrections/day
PRO ($9.99/mo): 300 AI corrections/day, keigo conversion of selected text (right-click), tone & email-structure check, custom dictionary
★ PRIVACY ★
Your text is processed securely and never stored permanently.
★ SUPPORT ★
Questions? Contact us at support@increoscale.com
Growth
Window
Users
Change
Ratings
Rating
7 days
0
+0.0%
0
0.00
30 days
+1
+6.7%
0
0.00
6 months
+13
+433.3%
0
0.00
Chrome Web Store search rankings
Where Keigo & Business Japanese Corrector - Japanese Grammar Checker AI - Fude appears when people search the store, with the 30 day change