Privacy Policy

Modu ("we", "the app") is a Chinese reading app for learners. This policy explains what data we handle and why. We do not sell your data, do not use third-party ad or tracking SDKs, and do not track you across other apps or websites.

Data we handle

• Account: if you sign in (Sign in with Apple, or Google where available), we store your email/account identifier and a display name (nickname) you choose, to provide your account.
• Anonymous device ID: a random identifier generated on your device, used for rate-limiting our AI services and product analytics.
• Learning data: your saved words, known words, reading progress, statistics and saved texts. All of it is stored on your device. What leaves your device depends on whether you sign in:
  • Signed out: no learning data is uploaded. Everything listed above stays on the device.
  • Signed in (free): only your vocabulary list is synced to our cloud, so you don't lose the words you collected when you change phones.
  • Signed in with Plus: additionally your known words, reading statistics, reading progress and profile (nickname) are synced.
• Usage analytics: in-app events (e.g. opening the reader, looking up a word, finishing a review) to understand and improve the app. These record that an action happened, not its content — we do not collect or store the words you look up or save.
• Crash diagnostics: when the app encounters an unhandled software error, we may collect its technical error type, allow-listed and length-limited technical stack frames, app version and build number, platform, and whether the error was fatal. We do not upload the exception's free-form message or context. This is used only to diagnose stability problems and does not include reading text, saved words, imported documents, or other learning content.
• Subscription: if you purchase Modu Plus, your subscription status and purchase history are processed to unlock paid features.

Where your data goes

• Supabase (hosted in Singapore): account, cloud sync of learning data, and analytics events.
• Our proxy (Cloudflare Workers): routes AI requests without exposing API keys in the app.
• DeepSeek: when you use AI explanations or generate content, the word and sentence you tap (or the topic/level you choose) are sent to DeepSeek to produce the result.
• Microsoft Azure (Text-to-Speech): when you use natural voice reading, the text you play is sent to Azure to synthesize audio.
• RevenueCat: processes your subscription status and purchase history from Apple App Store or Google Play purchases, associated with your account or anonymous purchase identifier.
• Apple / Google: used to sign you in when you choose that option, and to process purchases through the respective app store.

Sentence/paragraph translation runs on your device (offline) and is not sent anywhere.

Retention & deletion

Local data lives on your device until you delete it or uninstall. You can delete your account in Settings, which removes your cloud data, or request deletion at /delete-account. You can also export your data locally at any time.

Children

Modu is not directed to children under 13 and we do not knowingly collect their data.

Feedback & contact

If you send feedback from within the app, your message and any contact details you include are emailed to us so we can respond. Questions: moduReadApp@gmail.com