This Privacy Policy explains how DeltaChess ("we", "us", or "our") collects, uses, discloses, and protects information about users of our website, mobile applications, and related services (collectively, the "Services"). By using the Services, you agree to the collection and use of information in accordance with this policy.
1. Information We Collect
1.1 Information You Provide
- Account information: name, email address, username, password, profile picture, and any information you choose to add to your profile.
- Payment information: if you make purchases through the app, we may collect billing information (processed by third-party payment providers). We do not store full payment card details on our servers.
- User content: games, annotations, notes, messages, and other content you create, upload or submit through the Services.
1.2 Information Collected Automatically
- Usage data: information about how you use the Services (e.g., features used, game statistics, puzzle performance, and error logs).
- Device and technical data: device type, operating system, app version, unique device identifiers, browser type, IP address, and mobile network information.
- Analytics & cookies: cookies, local storage, and similar technologies to personalize and improve the Services.
1.3 Third-Party Sources
We may receive information about you from third parties, such as analytics providers, advertising partners, or social login providers (e.g., "Sign in with Apple").
2. How We Use Your Information
- Provide, operate, and maintain the Services.
- Process transactions and send related information, including purchase confirmations and invoices.
- Personalize content and features, including adaptive training and puzzle recommendations.
- Analyze usage to monitor, improve, and develop new features and services.
- Communicate with you, including support, updates, and marketing (where permitted by law).
- Protect the security and integrity of the Services and prevent fraud.
- Comply with legal obligations and enforce our terms and policies.
3. Legal Basis for Processing (If you are in the EEA)
If you are located in the European Economic Area, our legal bases for processing personal data include:
- Processing necessary for the performance of a contract with you (e.g., account creation, purchases).
- Your consent where required (e.g., marketing emails, non-essential cookies).
- Our legitimate interests (e.g., analytics, service improvements, fraud prevention), balanced against your rights and expectations.
4. Sharing and Disclosure
We may share your information with:
- Service providers: third-party vendors who perform services on our behalf (e.g., analytics, payment processors, cloud hosting).
- Business transfers: in connection with a merger, acquisition, or sale of assets.
- Legal reasons: when required by law, to respond to legal process, or to protect our rights, safety, or property.
5. Third-Party Services & Links
The Services may contain links to third-party websites, SDKs, or services. We are not responsible for the privacy practices or content of those third parties. Please review their privacy policies before providing personal information.
6. Data Security
We implement reasonable technical and organizational measures designed to protect your information. However, no method of transmission or storage is completely secure — we cannot guarantee absolute security.
7. Data Retention
We retain personal data as long as necessary to provide the Services and for legitimate business purposes, such as compliance with legal obligations, dispute resolution, and fraud prevention.
8. International Transfers
Your information may be transferred to — and processed in — countries other than your own. We take steps to ensure adequate protection of personal data when transferring across borders, including standard contractual clauses where required.
9. Children
The Services are not directed to children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe we have collected such information, please contact us and we will delete it.
10. Your Rights
Depending on your jurisdiction, you may have rights including:
- Access and obtain a copy of your personal data.
- Rectify inaccurate or incomplete data.
- Request deletion of your data.
- Object to or restrict processing.
- Request portability of your data.
- Withdraw consent (where processing is based on consent) — this will not affect lawfulness of processing before withdrawal.
To exercise these rights, contact us at the address below. We may need to verify your identity before responding.
11. Cookies & Tracking
We use cookies and similar technologies to operate and improve the Services. You can manage cookie preferences through your browser or device settings. For details about cookies we use, please contact us.
12. Marketing
If you opt in to receive marketing communications, you can opt out at any time by following the unsubscribe link in our emails or by contacting us directly.
13. Changes to This Policy
We may update this Privacy Policy from time to time. We will post the revised policy here with an updated effective date. Significant changes will be communicated through in-app notifications or email where appropriate.
14. Contact Us
If you have questions or concerns about this Privacy Policy or our practices, contact us:
- Email: [email protected]
Last updated: October 10, 2025