Last updated: 8 October 2026
This Privacy Policy explains how ACKPlus Solutions ("we", "us", "our") collects, uses and shares information when you use the Chess: Checkmate Club app, shown as "Chess" on your home screen and on Google Play (the "App"). By using the App you agree to this policy.
Contact: contact@ackplus.com
1. Who the App is for
The App is intended for a general audience aged 13 and over. It is not directed at children under 13 (or under the age of digital consent in your country), and we do not knowingly collect personal data from children. If you believe a child has given us personal data, contact us and we will delete it.
2. Information we collect
You can play as a guest without an account. As a guest, your games, puzzle progress, settings and history are stored on your device and are not linked to an account on our servers.
When you sign in (optional) or use online features, we collect:
- Account information: when you sign in with Google or Apple, your display name, email address, profile photo address and a unique user ID. With Sign in with Apple you can choose to hide your email.
- Profile and gameplay data: your display name, avatar, ratings, online game history, friends, game invites, notifications, puzzle attempts and levels, and daily play time.
- Live game data: moves, clocks and your online or offline presence while you play an online game.
- Subscription data: if you subscribe to Chess Pro, whether your subscription is active, its plan, its renewal or end date, and an anonymous purchase identifier linked to your user ID. We never receive your payment card details; Apple or Google handles the payment.
- Notification data: a device token so we can send you game invites and friend requests, if you allow notifications.
- Device and diagnostic data: app version, device model, operating system, language, usage events and crash reports, used to keep the App stable and improve it.
- Advertising data: device identifiers and ad interaction data used to serve and measure ads (see section 5).
We do not collect your precise location, contacts or photos. The camera is used only to scan a friend's QR code when you choose to, and no image is stored or sent.
3. How we use information
- To provide the App: matchmaking, online games, ratings, friends, invites and puzzles.
- To keep your profile, ratings, progress and history across your devices.
- To provide Chess Pro: to know whether you have an active subscription, to show the Pro badge by your name, and to restore your purchase on another device.
- To diagnose crashes and improve performance and features.
- To serve and measure ads that keep the App free.
- To prevent fraud, cheating, abuse and policy violations.
4. Chess Pro subscriptions
Chess Pro is an optional auto-renewable subscription sold through the Apple App Store and Google Play. Apple or Google processes your payment and holds your payment details under their own privacy policies. We use RevenueCat to check purchases and keep your subscription status up to date across devices. RevenueCat receives your purchase receipts, an app user ID (your account's user ID when you are signed in, or an anonymous ID as a guest) and basic device information. The Pro badge other players see by your name comes only from our server's record of a verified purchase.
5. Advertising
The App shows ads from Google AdMob and, through AdMob mediation, from Unity Ads: banner ads, native ads, and optional rewarded ads that you choose to watch in exchange for a benefit such as a hint, an undo or extra practice puzzles. Chess Pro subscribers see no ads. These partners may process device identifiers and ad interaction data to deliver and measure ads.
On iPhone, the App asks for permission through Apple's App Tracking Transparency prompt before using your device's advertising identifier. If you decline, ads are still shown but are not personalised.
In the EEA, the UK and Switzerland, we use Google's User Messaging Platform to ask for your consent before ads are served, in line with Google's EU User Consent Policy and the IAB Transparency and Consent Framework. You can change your choice at any time in Settings > Privacy > Privacy options.
We do not sell personal information for money. Depending on where you live, you may have the right to opt out of certain ad-related data sharing; contact us at contact@ackplus.com.
See Google's privacy policy (https://policies.google.com/privacy) and Unity's privacy policy (https://unity.com/legal/game-player-and-app-user-privacy-policy).
6. Third-party services we use
- Google Firebase: Authentication, Cloud Firestore, Realtime Database, Cloud Functions, Cloud Messaging, Analytics and Crashlytics, for accounts, data sync, online games, notifications, usage analytics and crash reports (https://firebase.google.com/support/privacy).
- RevenueCat: subscription management for Chess Pro (https://www.revenuecat.com/privacy).
- Apple App Store and Google Play: payments for Chess Pro.
- Google AdMob and Unity Ads: advertising (see section 5).
- Google Sign-In and Sign in with Apple: authentication.
These providers may process data on servers outside your country. We rely on their safeguards for international transfers.
7. Data retention and deletion
Guest data stays on your device and is removed when you uninstall the App or clear its data.
Account data is kept while your account exists. You can delete your account in the App at any time (Profile > Edit profile > Delete account). This permanently deletes your profile, ratings, game history, friends, invitations, puzzle progress, play-time records and subscription status from our servers. Games you played against other players stay in their history, shown as "Deleted player". You can also email contact@ackplus.com to ask for deletion.
Deleting your account does not cancel a Chess Pro subscription, because Apple or Google bills it. Cancel it in your Apple Account or Google Play subscriptions, or from the Chess Pro page in the App. Apple, Google and RevenueCat keep their own records of your purchases, as required for billing, tax and refunds. Short-lived server records of subscription events are deleted automatically within days.
8. Your rights
Depending on where you live (for example the EEA and UK under the GDPR, or California under the CCPA and CPRA), you may have the right to access, correct, delete or port your data, and to object to or restrict certain processing. To use these rights, contact contact@ackplus.com. You can withdraw ad consent at any time in Settings > Privacy > Privacy options.
9. Security
We use industry-standard measures, including encrypted HTTPS and TLS connections and access rules that let only you change your own data, to protect your information. No method of transmission or storage is completely secure, but we work to safeguard your data.
10. Changes to this policy
We may update this Privacy Policy from time to time. We will change the "Last updated" date above and, where appropriate, tell you in the App.
11. Contact us
Questions about this policy or your data: ACKPlus Solutions, contact@ackplus.com