Optional Chaining Technologies Ltda is the controller of personal information for the Cube Solver website, iOS and Android apps, and related services. Practices may vary by platform, version, and region.
Solving and scanning
We may collect puzzle photos and related information, including through automatic uploads, to provide scanning and solving features, investigate problems, and improve and train our puzzle recognition technology. Where available, you can manage optional improvement collection in the app. Camera permission does not constitute consent to training. Keep people, documents, and other private information out of photos.
Browser storage and website analytics
The website stores preferences, practice records, and puzzle information in your browser. Google Analytics runs automatically when you visit and uses device, connection, and activity data to measure website use and performance. Its cookies can last up to two years at a time, depending on your browser. The site offers no separate analytics choice. You can block or clear cookies and other site data in your browser. How Google uses data from sites that use its services.
App analytics and advertising
We use device and app information, IP addresses, identifiers, activity, and diagnostics to operate the apps, understand how people find and use them, and fix problems. We may record whether you took a screenshot or recorded your screen. This activity data does not include the image or recording. We may link campaign, activity, and purchase information, which can remain associated with your device over time.
Advertising providers may process identifiers, IP addresses and approximate location, ad interactions, and diagnostics to deliver and measure ads and prevent fraud. Ads may be personalized depending on your region, settings, and permissions. Non-personalized ads can still involve data processing. Use your device privacy settings and in-app ad choices where available. We do not share scan photos with advertisers or use them to target ads.
Purchases, email and support
App stores handle payments. We use transaction and purchase information to manage and restore access, administer purchases, and measure subscription activity. We may share purchase and app usage information with Apple to help review a refund request, subject to applicable consent requirements.
We use your email address to send updates after you confirm your subscription and use connection and signup data to prevent abuse. Use the unsubscribe link to stop updates. To handle support requests, we use contact details, app or device information and identifiers, and any messages and attachments you send, including photos.
Sharing and international transfers
We share information with providers that help us operate the service, process puzzle information and photos, measure usage, deliver ads and email, and handle payments. App stores and advertising providers may also process information under their own privacy policies. We disclose information when required by law.
Providers may process information outside your country. Where applicable, contact us for transfer information or a copy of relevant safeguards.
Legal bases
Where required, we rely on contract performance for processing necessary to provide a requested service or administer a purchase, and on legal obligations when they apply. We rely on legitimate interests in security, abuse prevention, troubleshooting, and support where your rights do not override those interests. Newsletter updates rely on consent. When consent is required for other processing, it must be obtained separately from this policy.
Retention and security
Retention depends on the purposes above and legal obligations. We may keep scan photos for diagnostics, recognition improvement, or training. There is no single fixed retention period for these photos. We may retain an unsubscribe record to honor your choice. Clearing site data or uninstalling the app does not delete information already sent to us or our providers. We take measures to protect personal information.
Privacy rights and choices
Depending on applicable law, you may request access, correction, deletion, restriction, portability, or object to processing, including direct marketing. You can withdraw consent without affecting earlier lawful processing and complain to the relevant regulator.
Under Brazil’s General Data Protection Law, you may also ask us to confirm processing, identify recipients, and explain the consequences of refusing consent. Subject to legal conditions, you can request anonymization, blocking or deletion of unnecessary, excessive, or unlawfully processed data; deletion of data processed on consent; or review of qualifying solely automated decisions. You can petition Brazil’s National Data Protection Agency (ANPD).
Contact us to exercise your rights or request that your scan data no longer be used for training. We may need to verify your identity or authority and locate the relevant records.
Children’s privacy
Children can use the tools. Camera images can include children, and their use can generate device and usage data. A parent or guardian can contact us to ask about a child’s data or request access or deletion where applicable.
Contact and updates
Email contact@optionalchaining.com for privacy inquiries. We may update this policy and provide notice as required by law.