Privacy policy
Mizi is an app for learning Mandarin. Here is, plainly, what the app keeps, why, and how to delete it.
What we keep
- Your progress: words, reviews, lessons, mock exams, streak, XP and settings. It lives on your device and in the cloud (Firebase, by Google), linked to your account, so it is never lost and shows up on another phone.
- Your answers: each answer in reviews and exercises (which word or sentence, whether it was right, when, and how many days after the previous review). It lives on your device and in the cloud, linked to your account, and is used to show you how much you remember after each interval and which tones you mix up (Profile → Your learning).
- Your account, if you create one: name, email and how you sign in (email and password, Apple or Google). If you sign in with Apple you can hide your email; we then receive a forwarding address. Your password never reaches us: Firebase handles it.
- Feedback you send from the app, with your rating and text.
- Crash reports and anonymous usage: when the app crashes, and which screens and steps are used (for example, "finished lesson 3"). They help us fix problems and improve the lessons. They contain no name, email or advertising identifier. You can turn this off in Settings → Privacy.
What we don't do
- We never sell or rent data.
- We don't track you across other apps or websites.
- We don't keep what you say in pronunciation practice. Speech recognition is done by your phone's system (Apple or Google), under their rules. To score your pronunciation, the short recording of the sentence (up to 6 seconds) is sent, along with the expected sentence, to Microsoft Azure's speech service through our server on Cloudflare. It is assessed on the spot and not stored. All we keep from this is how many assessments you made that day (for the daily limit), for two days.
On your device
Study reminders and home screen widgets are built on the device itself, from your progress. None of it is sent to anyone. You can turn reminders off in the app's or the phone's settings.
Who else sees the data
Only the services that make the app work: Google Firebase (authentication, Firestore database, Crashlytics crash reports and Analytics usage metrics) and, in pronunciation practice, Cloudflare and Microsoft Azure, which receive the recording only to assess it. These services may process data outside your country, with the safeguards required by law.
How long
For as long as your account exists. Anonymous usage metrics are deleted by Firebase after 14 months.
Your rights
At any time you can:
- see and take your data: Settings → Progress backup → Copy backup; and Profile → Your learning → Export answers (CSV);
- correct your name in Profile;
- delete everything: Profile → Delete account. The account, progress, answers and feedback are deleted immediately and cannot be recovered;
- withdraw consent for metrics: Settings → Privacy.
For any other request or question, write to contato@lunariscode.com.
This website
The mizi.web.app website uses no cookies or measurement tools until you accept them in the notice shown on your first visit. If you accept:
- Google Analytics (Google) counts visits and what is used on the page: pages viewed, language, clicks on the examples, country and device type. This data carries no name or email and is deleted after 14 months.
- Contentsquare (formerly Hotjar) records how the page is used (scrolling, clicks, and mouse or finger movements) so we can see what works and what confuses people. The site has no fields where you type anything.
If you decline, none of this is loaded. Your choice is stored in your browser; to change it, use the Cookies link at the bottom of any page.
In the lesson on the home page, the tone voice test only uses the microphone if you tap its button and your browser asks for your permission. The sound is analyzed on your device while you speak, and is not recorded or sent anywhere.
Children
The app is suitable for all ages and asks for no data beyond what is described here. Children under 13 should create an account with a parent or guardian.
Changes
If this policy changes in an important way, we will tell you in the app before the change takes effect.