Privacy

Petri Defence · last updated 17 October 2026

This covers the Petri Defence website and the iPhone and iPad app. Petri Defence doesn't ask for your name, your email or an account. You can play without signing in.

Your progress

Your levels, stars and settings are saved only on your own device, in your browser or in the app. They're never uploaded. If you clear your browser's data for this site, or delete the app, your progress is deleted with it.

Anonymous play statistics

To learn whether the game is fun and whether people come back to it, the game sends anonymous events to Umami, a privacy-focused analytics service. It sends things like "a level was started" or "a level was won" along with the level number, plus your screen size and language. Each device gets a random code that's made on the device, so we can count returning players. That code isn't linked to your name, email or any account.

The app sends the same anonymous events. Umami uses no cookies and doesn't track you across other websites or apps. We don't sell or share this data, and we only use it to improve the game.

Daily reminder (app only)

If you switch on the Daily reminder, the app asks your phone to show one notification the next day. The reminder is set up on your phone and nothing about it is sent to us. You can switch it off in the game's Relaxed list or in your phone's settings.

Purchases (app only)

The app's shop sells optional bundles of cosmetic items. Payments are handled entirely by Apple (or Google on Android): we never see your card or payment details, your name or your Apple ID. The app only learns which bundle you bought, so it can give it to you, and the anonymous play statistics count which bundle was bought, with no link to you.

Challenge links

A "Challenge a friend" link carries only the level and your result (stars, pieces used and how many got through). It's sent only when you choose to share it, and it doesn't contain your name or any other details.

Questions

Email [email protected].

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