Kana Juku Support
Bug reports, usage questions, and privacy requests all start from this page.
FAQ#
Q: Handwriting recognition keeps making mistakes. What should I do?
A: Make sure you’re not writing too fast — pause briefly after each stroke before lifting the pen. The recognition model needs complete stroke information. If the problem persists, try resetting the recognition calibration in Settings.
Q: How do I download the local AI model? Do I still need internet after downloading?
A: When you first use an AI feature, the app will prompt you to download the model (a few hundred MB). Once downloaded, all AI features work fully offline — no internet connection required.
Q: The custom keyboard doesn’t appear in other apps?
A: The built-in keyboard in Kana Juku is for in-app use only and is not a system-level keyboard extension. To type Japanese in other apps, please use the iOS system Japanese keyboard.
Q: The home screen widget isn’t updating kana?
A: Try long-pressing to remove the widget from the home screen, then re-adding it. If it still doesn’t update, force-quit and relaunch the app, or restart your device.
Q: My learning progress has disappeared?
A: Progress is stored locally on your device. Uninstalling the app will erase all data. iCloud backup is not currently supported. If progress disappears without uninstalling, please email us with details.
Troubleshooting#
- Force quit and relaunch the app (swipe up on the app in the app switcher)
- Check iOS version ≥ 17.0
- Check available storage (AI models require ~1–2 GB)
- If none of the above works, uninstall and reinstall (note: progress data will be erased)
Contact Support#
📧 qqder339@gmail.com
Subject: [Kana Juku] Issue Description
Please include: device model, iOS version, app version, steps to reproduce (screenshots welcome).
This app collects no user data. All data is stored locally on your device. View Privacy Policy →