Privacy Policy — Chain Reaction Online

Last updated: 5 November 2026

This policy explains what Chain Reaction Online ("the app") collects, why, and what you can do about it.

What we collect

• A device identifier generated by the app on first launch. It is how the app recognises you; there is no password.
• Your display name and username, if you choose to set them. They are shown on leaderboards and to opponents.
• Game data: results, rating, achievements, campaign and puzzle progress, and the moves of online games while they are played.
• A push notification token, only if you allow notifications, used to tell you about your turn, challenges and streaks, and, unless you switch off Settings → Game invites, at most once a day when a player you have played is online or someone is waiting for a game.
• App and device details: the app version and build, the update it is running, the operating system version, the device model (on Android) and your time zone, stored with your account so we can see which versions are in use and fix problems on them.
• Crash and error reports, including app version, the screens visited just before the error, device type, operating system version and IP address, so we can fix problems.
• Apple or Google account identifier, only if you choose to save your account with Sign in with Apple or Google. We store the stable account ID that Apple or Google gives us so you can restore your progress after reinstalling. We do not store your email address.

We do not collect your contacts, precise location, photos, or payment details.

Pro subscriptions

Pro is an auto-renewing subscription (monthly or yearly) bought through Apple or Google, who handle all payment details; we never see them. We receive the store's transaction or purchase ID, check it with Apple or Google, and store it with its expiry date so Pro follows you to your other phones. While a subscription is active we periodically ask Apple or Google whether it has renewed, been cancelled or refunded. Manage or cancel it in your Apple ID or Google Play settings. See the Terms of Use.

Ads

The app shows a full-screen ad between games, through Google AdMob, and optional ads you choose to watch for a bonus (for example ×2 Elo); for those, AdMob confirms the reward to our server with a signed callback. Players with Pro are shown none. Ads are non-personalised. To serve and measure them and to prevent fraud, AdMob may collect your device's advertising identifier, an approximate location derived from your IP address, and ad interaction and diagnostic data. See how Google uses this data.

How it is used

Only to run the game: matching and playing online, leaderboards, saving and restoring your progress, notifications you have allowed, and fixing crashes. We do not sell your data, the ads are not personalised, and we do not track you across other apps or websites.

Who processes it

Our servers are hosted by Railway. Crash reports go to Sentry. Push notifications are delivered through Apple (APNs) and Google (Firebase Cloud Messaging). Sign-in uses Apple and Google. Ads are served by Google AdMob. Each handles data only to provide that service.

Deleting your data

You can delete your account at any time in the app: Settings → Request Account Deletion. Deletion is immediate and removes your profile, game history, achievements and any linked Apple or Google sign-in (an Apple sign-in is also revoked with Apple). You can also email us to ask for deletion.

Children

The app is rated 4+. It collects only the game and ad data described above, from anyone, and asks for no contact details.

Changes

If this policy changes, the new version will be posted on this page with a new date.

Contact

adhip49@gmail.com