Privacy Policy — Yayu

Last updated: 12 November 2026

Yayu shows one Chinese word a day. There are no accounts and no sign-in. The app is free, with adverts; Yayu Premium, an optional subscription through the App Store or Google Play, removes them and makes Review unlimited.

What stays on your phone

Your words, favorites, word lists, settings and progress are kept on your phone and are not uploaded to us. Word lists you import (from text, a file, a photo or a link) are read on your phone. What you search for is never sent. Deleting the app removes this data, although a device backup may restore it.

What the app sends

Usage information, to us. To learn how Yayu is used and improve it, the app sends counts of how its features are used, such as opening the app, playing a pronunciation or starting a review, to a server we run. A few of these say which built-in word was involved, for example when you favorite a word. Each count carries a random identifier for your installation (not for you), your device model, operating system and app version, whether you have a subscription, and the country the request came from. We do not record your IP address.

Diagnostics, to us and to Sentry. Crash reports and performance measurements are sent to us and to Sentry so problems can be fixed. They describe the app and the device, not what you were reading.

Adverts, from Google. Adverts are provided by Google AdMob. Requesting one sends Google your IP address and device information, and on Android your device's advertising ID. On iPhone and iPad, adverts are not personalised and Yayu never asks to track you. In the EEA and the UK you are asked for consent first, and you can change your choice in Settings. Google handles this data under its own privacy policy. Premium removes adverts.

Text recognition on Android. Reading a photo or scanned page uses Google's ML Kit on your phone. ML Kit sends Google basic usage and performance information, never the image or its words.

Subscriptions, through Apple or Google. Purchases are handled by the App Store or Google Play; we never receive your payment details, name or store account. To confirm a subscription, the app sends the store's proof of purchase to our server, which checks it with Apple or Google and does not keep it.

Sharing and Pleco. Exporting, sharing or saving a card goes only where you choose. Sending your favorites to Pleco happens on your phone; the list is not sent to us or to Pleco's servers.

What Yayu does not do

• It does not sell your data.
• It does not track you across other companies' apps or websites.
• It does not access your location, contacts, microphone or camera, or browse your photos. It reads only a photo or file you pick, and saves only a card you ask it to.

Children

Yayu is not directed at children and does not knowingly collect personal information from children.

Changes

If this policy changes, the date at the top changes with it.

Contact

Questions about this policy: [email protected]