Privacy Policy (Android / iPhone app)

Last updated: 2026-07-13

This policy applies to the "Kotonoa" kanji app for Android and iPhone ("the App"). The website (kotonoa.jp) is covered separately. The App is designed for children and respects your privacy.

Learning data (on-device only)

Progress and settings are stored only on your device and are never sent to or collected by us. We do not automatically sync or back up data to any server or cloud. The App provides a feature for you to manually export and restore a backup file; you choose where it is saved using your device's file picker and you control that file — we never receive its contents. Uninstalling the App deletes the in-app data (any backup file you exported remains where you saved it).

Information we do not collect

The App does not collect names, email addresses, phone numbers, addresses, location, contacts, photos, or advertising IDs (AAID/IDFA). We do not collect personal information from children.

Purchases and subscriptions

Only when you purchase or use a paid subscription, information is sent to process the purchase and manage subscription status: Google Play (payments; App Store on iPhone) and RevenueCat (subscription management). RevenueCat handles an app-generated anonymous ID, purchase/subscription history and status, and standard purchase metadata such as country, IP address, and platform. It does not include names, email addresses, children's personal information, or advertising IDs. These are used only to activate/restore purchases, prevent fraud, and manage subscription status — never for advertising.

Network

The App's learning features are available offline. It may connect to the internet to update or add content and to verify purchase or subscription status.

Ads and tracking

The App shows no ads, does no behavioral/remarketing advertising, uses no third-party analytics or tracking SDKs, and does not collect advertising IDs.

Children's privacy

The App is directed to children and, consistent with Google Play's Designed for Families program, COPPA, and GDPR-K, collects no personal information from children. Purchases are intended to be made by a parent (an adult-verification step precedes purchase).

Third-party services

Google Play / App Store (payments) and RevenueCat (subscription management), each subject to its own privacy policy (Google, RevenueCat). These services may process data on servers outside Japan (e.g., the United States).

Retention / deletion

On-device learning data is deleted on uninstall. Purchase-related data follows Google's and RevenueCat's policies.

Requesting data deletion

To request deletion of data we hold in relation to the "Kotonoa" kanji app, please use our contact form or email info@kotonoa.jp, including your Google Play order ID (found in your purchase confirmation email or the Play Store "Order history").

What is deleted: if you purchased a paid plan, the app-generated anonymous ID and the purchase/subscription history and status held by RevenueCat (we delete these via the RevenueCat dashboard or API). On-device data such as learning progress and settings is removed from your device when you uninstall the App. We do not retain purchasers' names or email addresses, so we verify requests using the order ID.

Timing / retention: we delete the data within 30 days of receiving your request. Where retention is legally required (e.g., store transaction records), we retain it only to the extent and for the period required.

Contact

For questions about this policy, please use our contact form. For purchase or subscription support (e.g., a purchase not showing up), include your Google Play order ID (in your purchase confirmation email or the Play Store "Order history") in the contact form. After reinstalling or switching devices, first try "Restore purchases" in the App. Because we do not retain purchasers' names or email addresses, we verify and investigate using the order ID.

Changes

We may revise this policy when we change features or services, when laws change, or when we otherwise consider it necessary. A revised policy takes effect when posted. For any change that newly expands our handling of children's personal information, we will obtain parental consent before it applies. Continued use after a revision constitutes acceptance.