Privacy policy

Last updated: 18 October 2026

Zuno is made by Christopher Biguet. This policy explains what the app collects, where it is kept and why.

What Zuno collects

  • Your account: email address and password. The password is stored only in scrambled (hashed) form, so nobody can read it, including us. If you use Sign in with Apple, Zuno instead receives from Apple an identifier for your Apple Account and the name and email you choose to share (which can be a private relay address); Zuno never sees your Apple password.
  • Your profile: first name, last name, birthday, newsletter choice and, if you add one, a profile photo.
  • Your learning progress: words studied and learned, saved words and sentences, daily activity and time spent in the app, and your level choices.

Where it is kept

Your account, profile (except the photo) and learning progress are stored in your Zuno account on servers run by Supabase, the service Zuno uses for accounts. That is what lets you sign in on a new iPhone and keeps your progress the same on all your devices. Supabase also records technical details of each sign-in, such as the IP address, to protect your account.

A copy is kept on your iPhone so Zuno works offline. Your profile and sign-in are kept in the iPhone's secure Keychain and are not included in iPhone backups. Your profile photo stays on your iPhone only and is never uploaded.

Why

Your email and password let you sign in and recover your account. Your name and birthday personalise the app (greetings, birthday message). Your progress powers the lessons and statistics and is synced between your devices. Only if you tick the box, your email will be used for a Zuno newsletter once one exists.

Zuno does not sell your data or share it with anyone else, and uses it for nothing beyond running and improving the app.

Analytics and crash reports

Zuno uses TelemetryDeck, a privacy-focused analytics service, to count anonymous usage events, such as a conversation passed or a daily goal reached, together with basic device information (iPhone model, iOS and app version). It never receives your name, email, answers or searches; it uses a random, scrambled (hashed) identifier, so events can't be traced back to you. You can switch this off in Settings › Share anonymous usage.

Advertising. Zuno is free and shows ads from Google AdMob at natural breaks (after a conversation, after a series of cards, when the dictionary first opens each day, after a second Reveal), at most 5 a day. In the European Union, Google's consent form asks before any ad. Apple then asks whether Zuno may track you: if you allow it, Google may use your device's advertising identifier to show ads that fit your interests; if you don't, ads are not personalised. Google receives your device's advertising identifier (only if you allowed tracking), your approximate location from your IP address, and how ads are shown and tapped; Google's privacy policy applies (policies.google.com/privacy). Zuno never shares your name, email, answers or progress with advertisers. "No ads for life" removes all ads. Apple may share anonymous usage and crash information with the developer if you allowed this in your iPhone's settings.

Purchases

Tips ("Buy me a coffee") and "No ads for life" are processed by Apple. Zuno never sees your payment details.

Your choices

In Settings › Profile you can change your details, export all your data as a file, log out, or delete your account. Deleting your account permanently erases your account, profile and progress from Zuno's servers and from this iPhone. Logging out ends the sign-in on this iPhone only.

Children

Zuno is for people aged 13 and over and does not knowingly register younger children.

Changes and contact

If this policy changes, the new version will appear here. Questions: support@zunolanguages.com.