Privacy Policy

1. Information We Handle

(1) Data you create

Card content (text, images, and handwriting), decks, tags, and study history (such as when you reviewed which card). This data is stored only on your device and in your own iCloud. It is not sent to any server operated by the Developer, and the Developer cannot see its content.

(2) Usage data (sent to Amplitude)

• An identifier assigned to each device
• Records of actions in the App (for example, creating your first deck or card, reaching a certain number of reviews, opening the purchase screen, completing a purchase, or exporting a deck)
• Your answers to the first-launch survey (your role, such as student or working adult, and how you found the App)
• The type of plan you purchased
• General device information such as device model, OS and app version, language setting, and approximate country or region

We do not send study content such as card text, images, or deck names. IP address and carrier collection are turned off.

(3) Purchase data (sent to RevenueCat)

• Transaction information provided by Apple (purchase, renewal, and cancellation status, product, date, price, country or region, etc.)
• A random user ID assigned by RevenueCat
• A token issued by Apple’s AdServices to determine whether the App was installed through an Apple Search Ads ad

(4) Website browsing data (collected by Google Analytics)

Pages viewed, browser and device information, and actions on the site, collected using cookies and similar technologies.

Information we do not collect

The App does not collect your name, email address, phone number, postal address, precise location, contacts, Apple Account password, or credit card information. We do not track you using the advertising identifier (IDFA). If you contact us, we use your email address and message only to respond to you.

2. How We Use Information

1. To provide the App’s features, such as saving and syncing cards
2. To check purchase status and respond to inquiries
3. To analyze usage and improve the App and this website
4. To measure the effectiveness of ads and referrals

3. Where Data Is Stored

Data you create is stored in Apple’s iCloud (CloudKit private database), linked to your own Apple Account. If iCloud is unavailable, data is stored only on your device and is not synced to other devices. In that case, deleting the App also deletes the data.

Files created with the deck export feature are saved to a location you choose and are managed by you.

4. External Services

The App and this website use the following external services, and the information below is sent to each. Each provider handles the information under its own privacy policy and its agreement with the Developer.

These providers are based in the United States, and information may be processed on servers in the United States and other countries.

You can stop Google Analytics collection with Google’s opt-out browser add-on (https://tools.google.com/dlpage/gaoptout).

5. Sharing with Third Parties

The Developer does not sell your information. Apart from the external services in Section 4, we do not share your information with third parties except as required by law.

6. Payments

Paid plans are purchased through Apple’s App Store, and payment information is managed by Apple. The Developer never receives your credit card information.

7. Deleting Data

• Cards and decks: you can delete them in the App at any time.
• All data: use “Delete All Data” on the App’s Settings screen. Data already synced to iCloud is also deleted.
• Data in iCloud: open Settings > [your name] > iCloud on your device to delete the App’s data. Deleting the App from your device does not delete data in iCloud.

8. Minors

If you are a minor, please use the App with the consent of a parent or guardian. Always obtain their consent before purchasing a paid plan.

9. Changes to This Policy

We may revise this policy in response to changes in law or in the service. For material changes, we will announce the changes and their effective date in advance on this website or in the App.

10. Contact

For questions about this policy, or to request disclosure, correction, or deletion of your information, please email:

help.kiokuma@gmail.com