Seodang Privacy Policy

Last updated: August 25, 2026

Service

Seodang is a kanji learning app. The app lets users browse kanji categories, view kanji details, practice writing, save favorites, track recent practice, and configure study reminders.

Data Stored On Your Device

Seodang stores the following data locally on the user's device:

• App language and theme settings
• First-run onboarding progress
• Favorite kanji
• Practice progress, scores, attempts, and recent practice history
• Category progress reset state
• Study reminder settings

This local data is stored with AsyncStorage and is used only to provide app features. It is not sold.

Data Fetched From Supabase

Seodang fetches public kanji learning data from Supabase, including kanji metadata, categories, stroke order data, and example sentences when available. Seodang does not currently require user login and does not upload individual user practice history to Supabase.

Notifications

If the user enables study reminders, Seodang asks for notification permission and schedules local notifications on the device. Notification settings are stored locally. The app does not send reminder messages to a remote server.

Data Sharing

Seodang does not sell user data. The app uses Supabase as a backend content provider. Network requests to Supabase may include standard technical information processed by Supabase as part of providing the service.

Subscriptions and Rewarded Ads

The optional Today’s Reading subscription is processed by Apple App Store or Google Play. RevenueCat processes an anonymous app user identifier, product and entitlement information, subscription status, and purchase history so the app can provide and restore access. Seodang does not receive full payment-card details.

Free users may choose to watch a Google AdMob rewarded ad to unlock one reading level for the day. Google and its advertising partners may process device and advertising identifiers, IP address, network-derived approximate location, diagnostics, and ad interactions for ad delivery, measurement, and fraud prevention. Where required, the app presents a consent flow before requesting an ad.

Third-Party Services

• Supabase, for public kanji data and Edge Functions
• Expo / React Native, for app runtime, builds, and notifications
• RevenueCat, for subscription entitlement and purchase status
• Google AdMob, for optional rewarded ads

Open-source data source and license notices are available in the app Settings screen and on the Third-Party Notices page.

User Choices

Users can change app settings, remove favorites, reset category progress, edit or delete study reminders, disable notifications in device settings, or delete local app data by uninstalling the app.

Contact

For privacy questions or support requests, contact satge13@gmail.com.