KeigoScan: Politeness Checker
Check keigo before you send
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Paste a message and get a 0-100 rudeness score in seconds. Every keigo slip is highlighted with a reason and a fix, plus a corrected full text. All on-device and free.
“Is this keigo correct?” Ten seconds before you hit send, turn anxiety into confidence.
Paste an email or chat message (or load a screenshot) and get a rudeness score from 0 to 100, plus exactly what to fix, where, and why. Everything runs in a rule engine on your device — your text never leaves it.
■ Rudeness score (0-100)
A dictionary of 40 real keigo mistakes — double honorifics, mixed-up humble and respectful forms, casual “baito keigo”, business NG phrases, excessive politeness, plain casual speech — plus five email-manner checks. Three bands (safe / caution / danger) tell you at a glance whether it is ready to send.
■ Recipient-aware judging
Choose client, boss, or colleague, and the strictness adjusts. The same message can be fine for a colleague and risky for a client — now you can see it.
■ Every issue explained
Each mistake is highlighted with a suggested fix, a one-line reason, and a category tag, so your keigo actually improves.
■ Corrected full text, one tap to copy
The app generates a corrected version of the whole message. Copy, paste, done.
■ Screenshot input
Pick a screenshot of LINE or a mail app, and on-device text recognition reads it. Images never leave your device.
■ History
Scans are saved automatically so you can review your recurring habits.
■ Privacy
- All checks run entirely on your device; works offline
- No account required
■ About ads
A small banner appears at the bottom. A one-time “Remove Ads” purchase ($0.99, no auto-renewal) hides it forever. No feature limits either way, and no subscriptions.
For new hires, career changers, and anyone writing to clients: make the ten seconds before sending a habit of confidence.
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The developer, 丽佳 施, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
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- Identifiers
Data Linked to You
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- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 丽佳 施
- Size
- 6.1 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Remove Ads $0.99
- Copyright
- © 2026 Jayden Chen