Luobi Privacy Policy

Effective date: October 14, 2026

Luobi is an app for learning to read, understand and write Chinese characters. This policy explains what happens to your data when you use it. The short version: everything stays on your device. Luobi has no account, no server, no analytics and no advertising.

What Luobi stores

Luobi stores the following on your device only:

• your study progress: the characters you have studied, your answers, your review schedule and your study time;
• your custom sets and favourites;
• your settings, and whether you have unlocked the full version.

None of this is uploaded, shared or sold. Luobi has no account, no server, no analytics, no advertising and no tracking. The dictionary, the stroke data, handwriting recognition and everything else run on your device and work offline. Luobi's own code never connects to the internet.

Backups

• Backup in Settings: Luobi writes one file with your progress and settings, and saves it only where you choose in Android's save dialog: your phone, a memory card, or a cloud drive such as Google Drive if you pick it there. Restoring reads only the file you choose. Luobi never uploads a backup by itself.
• Android's device backup: if you have turned on backup for your phone in Android's settings, Android may include Luobi's data in your phone's backup to your Google account, so that your progress comes back on a new phone. Android and Google do this under Google's terms; Luobi doesn't receive or see that backup.

Other apps and services

Luobi works with other apps only when you ask it to:

• Google Play: if you buy the full version, the purchase is handled by Google Play under Google's terms and privacy policy. Luobi only learns whether the purchase was made. Google's in-app billing library, which is part of the app, may send diagnostic information about purchases to Google; this is why the app lists the internet permission.
• AnkiDroid: "Add to Anki" adds notes to AnkiDroid on your device. This needs AnkiDroid's permission, which Android asks you for the first time. Without AnkiDroid, Luobi saves a text file for Anki only where you choose.
• Your e-mail app: "Report a mistake" opens your own e-mail app with a message to Sumire Labs, filled in with the character, its readings and meaning as shown, its level and the app version. Nothing is sent unless you send it yourself. If you do, we receive your message and your e-mail address, and use them only to reply and to fix the mistake. "Contact" on the About screen works the same way.
• Text-to-speech: pronunciation uses your phone's text-to-speech engine. Luobi passes it only the character or word to read aloud. The engine is part of your phone, and its provider's privacy policy applies to it.
• Your browser: links on the About screen open in your browser.

Permissions

• Notifications: only for the daily study reminder, if you turn it on. The reminder is scheduled on your phone; nothing is sent anywhere.
• Run at startup: to set the reminder again after your phone restarts.
• AnkiDroid database: only when you add something to Anki.
• In-app purchases (billing) and internet: required by Google Play's billing library for the one-time unlock (see above).

Deleting your data

Uninstalling Luobi, or "Clear storage" in Android's settings for the app, removes all of its data from your device. Backup files you saved yourself stay where you saved them; delete them there. Android's device backup is managed in your phone's and Google account's settings.

Children

Luobi does not collect personal information from anyone, including children.

Changes

If this policy changes, the new version will be published here with its effective date updated.

Contact

Questions about this policy or your data: sumirelabs.app@gmail.com