Privacy Policy

1. Introduction

Daily Kanji is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you use the Daily Kanji application and related services. By using Daily Kanji, you agree to the practices described in this policy.

2. Information We Collect

We may collect the following types of information:

• Personal Information: When you create an account, we may collect your name, email address, and profile information.
• Third-Party Authentication: If you sign in using a third-party service (e.g., Apple, Google), we receive basic profile information from that provider.
• Usage Data: How you use the app, such as session length, screens viewed and features used, and, for ad measurement, whether an ad led you to install it. This is tied to your account; on iOS the advertising identifier is only included if you allow tracking.
• Learning Data: Your kanji study progress, quiz results, review history, and streak information are stored to power your personalized learning experience.
• Identifiers: A user ID for your account, a device identifier, and, only if you allow tracking on iOS, the advertising identifier (IDFA).
• Purchase Information: Your free trial and subscription status, including the product, price and dates. Apple handles payment; we never see your card details.
• Diagnostics: Crash reports and performance data that help us find and fix problems.

3. How We Use Your Information

• To deliver and improve the Daily Kanji service, including personalized kanji recommendations and spaced repetition scheduling.
• To send you notifications such as daily kanji reminders, streak updates, and study nudges (you can opt out at any time).
• To update lock screen and home screen widgets with your daily kanji content.
• To analyze aggregated, anonymized usage trends to improve the app experience for all users.
• To measure whether our ads on Facebook and Instagram bring new learners, as described in section 8.

4. Data Security

We take reasonable measures to protect your information. Your data is stored on secure servers with industry-standard firewalls and encryption. However, no method of transmission or storage is 100% secure, and we cannot guarantee absolute security.

5. Device Permissions & Widgets

Daily Kanji may request device permissions to enable features such as lock screen widgets and notifications. Background fetch is used solely to keep your widgets updated with fresh daily kanji content. We do not access any data on your device beyond what is necessary to provide these features.

6. Data Deletion

You may request deletion of your account and all associated data at any time by contacting us at aarontiberjohn@proton.me. We will process your request within 30 days.

7. Contact Information

If you have any questions or concerns about this Privacy Policy, please contact us at aarontiberjohn@proton.me.

8. Advertising Measurement

We advertise Daily Kanji on Meta platforms (Facebook and Instagram). To measure whether those ads work, the app includes the Meta (Facebook) SDK. It sends Meta information about app installs and opens, completed onboarding, free trial starts, subscription purchases and restores (the product and price, never your payment details), together with a device identifier and your Daily Kanji user ID. Meta uses this data to attribute installs and purchases to its ads, to optimize ad delivery, and, where you've allowed tracking, to show you more relevant ads.

On iOS, Daily Kanji asks for your permission through Apple's App Tracking Transparency prompt before using the advertising identifier (IDFA) for this purpose. If you choose "Ask App Not to Track", the advertising identifier isn't shared, Meta receives only limited measurement data that isn't used to identify you across other apps, and every feature of the app works exactly the same. You can change your choice at any time in Settings > Privacy & Security > Tracking. Meta's handling of this data is described in the Meta Privacy Policy.

9. Analytics and Diagnostics

We use PostHog to understand how the app is used (screens viewed, features used, and session recordings in which typed text is masked) and to find and fix crashes and errors. This data is tied to your Daily Kanji user ID and is used only to improve the app.

10. Subscriptions and Purchases

Subscriptions are sold and billed by Apple through the App Store; we never see your payment details. We use Superwall to present subscription offers and to record your trial and subscription status (product, price, start and renewal dates), tied to your user ID, so the app can unlock paid features and so we can understand how many learners subscribe.

11. Where Your Data Is Stored

Your account and study data (email address, name if your sign-in provider shares it, your decks, cards and progress) are stored with Supabase, our hosting provider, and used only to run the app and sync your data between your devices and widgets.