Privacy

Privacy policy

Effective 26 October 2026 · applies to the Duel Stone Android app and to duel-stone.com

Duel Stone does not collect your data. There is no account to make, no analytics in the app, no advertising, and no server of ours for anything to be sent to. This page explains what that means in practice, and what the app does touch on your phone.

What we collect

Nothing. The app gathers no personal information, no device identifiers, no advertising ID, no location, no contacts, no usage or analytics events, and no crash reports. We do not build a profile of you, because we never receive anything to build one from.

Because nothing is collected, nothing is shared, sold, or transferred to anyone — there are no third-party SDKs in the app to share it with even if we wanted to.

What is stored on your device

The game keeps its saves in its own private app storage on your phone. Each person who plays on the phone can have a profile of their own, up to four, and each profile is kept in its own file, with backup copies the game makes so that an interrupted save cannot lose your progress. A profile holds the things you would expect a game to remember:

• the name you give the profile when you first play;
• your progress — account and class levels, unlocked classes and abilities, campaign progress and achievements;
• your gold, embers and the gear you own or have equipped;
• your own settings for how the game plays, such as how the bundle turns.

Settings that belong to the phone rather than to a player — sound levels and the graphics quality tier — are kept in one small file that every profile shares, and another small file notes which profile was played last.

The phone also keeps a play log of your single-player duels: for each one, the duel and who you fought, your class and level, abilities and gear tiers, the pairs you matched each round, both fighters' health at the end, how it ended, the game version and the time, with no name, account or device identifier. It leaves your phone only if you send it yourself with Share or Copy play log in Settings.

Apart from a play log you choose to send, none of these files ever leaves your device. We cannot read them. Deleting a profile in the game removes its file and its backups; deleting the app removes all of them, and there is no copy anywhere else — which also means uninstalling loses your progress.

Multiplayer over your local network

Duel Stone's multiplayer is played on one Wi-Fi network between phones in the same room. There is no matchmaking service and no server in the middle: one phone hosts, the other joins it directly over the local network, and the two exchange the moves of the match while it lasts.

While you are hosting, the app broadcasts a small announcement on your local network so nearby phones can list your game. That announcement carries the name of the profile you are playing as, your chosen class, and the technical details needed to connect. It is visible only to devices on the same network, it stops when you stop hosting, and it never reaches the internet or us. During a match, the other phone is shown the same name.

This is why the app asks for network permissions on Android. They are used for local discovery and local play, and for nothing else.

The beta

The beta is a Google Group, hosted by Google, and nothing about it is stored on our infrastructure. As the group's owner, we can see each member's email address and name, and we delete the group when testing ends.

The group is a Google service, so Google's privacy policy covers it. You can leave the group at any time from Google Groups.

This website

duel-stone.com is a static site. It has no forms and asks you for nothing. It sets no cookies, runs no analytics or tracking scripts, and loads no third-party resources — the fonts and images are served from this domain rather than a content network, specifically so that visiting this page does not hand your IP address to anyone else. Our host, Cloudflare, processes requests to serve the site and keeps standard server-side logs as part of that; we do not add any tracking of our own on top.

Children

We collect nothing from anyone, and that includes children. There is no account creation, no chat, no user-generated content, and no advertising in the app, so there is no channel through which a child's personal information could reach us.

Getting the app

Duel Stone will be distributed through Google Play. Downloading and installing anything from Play is governed by Google's own privacy policy, which is separate from this one and outside our control.

Your rights

Rights to access, correct, export or delete personal data all depend on someone holding it. We hold none, apart from any play log you choose to send us, which we use only to tune the game and delete when testing ends. If you want the data the game stores about you gone, deleting your profile or uninstalling the app removes it completely from your device.

When this page changes

Duel Stone is still being built, and features that would change this policy are on the roadmap — advertising, purchases, or play over the internet. If any of them ship, this page will be updated to describe exactly what is collected and why, with a new effective date at the top, and the Play Store listing's data-safety information will be updated to match. We will not quietly start collecting something and correct the wording afterwards.

Contact

Questions about this policy, or about anything the app does, go to contact@duel-stone.com .