Privacy Policy

Learning on your device

SQL practice runs locally on your device. The app does not upload your SQL queries, practice results, learning progress, attempts, or review schedule to Duvdex or RevenueCat. You do not need an app account, and the app does not ask for your name or email address. Your device's backup settings may include local app data in operating-system backups.

Purchases

The optional Pro unlock is a one-time in-app purchase processed by Apple or Google. RevenueCat handles purchase validation and access restoration. It processes an anonymous app-installation identifier, purchase history, product and transaction identifiers, receipts or purchase tokens, purchase and entitlement status, and basic app and store metadata. These purchase-related records leave your device.

Apple or Google handles your store account and payment details. SQLlearn does not receive your card number or your Apple or Google password.

How information is used

Purchase-related information is used to validate purchases, unlock and restore Pro, help prevent purchase fraud, and understand purchase activity through RevenueCat's billing reports. SQLlearn has no advertising, advertising-identifier collection, cross-app advertising tracking, or separate marketing analytics SDK.

Services and security

Apple, Google, and RevenueCat process purchase information as part of their services. Billing connections use encryption in transit. Service providers may process information outside your country and receive technical request metadata, including IP addresses. The app does not request GPS or precise-location permissions.

The published privacy page is hosted on GitHub Pages. GitHub may process website request metadata under its own privacy policy. This page does not add advertising cookies, analytics scripts, or external font requests.

Service policies: RevenueCat, Google, Apple, and GitHub.

Storage and privacy requests

Local learning records remain on your device until you clear app data or remove the app. Operating-system backups are managed separately by your device and account settings. Purchase-related records are kept as needed to provide access and restoration, handle support, prevent fraud, and meet applicable legal obligations.

Email support@duvdex.com to request access, correction, or deletion of information we control. We may need a store order reference or other ownership proof to find the correct billing record. Do not send passwords, sign-in codes, or card details. Deleting billing records can affect purchase restoration; it does not automatically refund a purchase or erase store-managed transaction records. Some legal or security records may need to be retained. We do not promise immediate erasure from every service or backup.

Children

The Google Play release targets users aged 13 and over. The app does not verify age automatically. Store purchase restrictions and parental controls still apply. Contact us if you believe a child has provided information that requires attention.

Contact

Contact Duvdex LLC at support@duvdex.com. We date revisions to this policy and update the disclosures when our information handling changes.