Effective date: September 23, 2026 Developer: JINGZHE JIANG
The service 19×19 provides multiplication lessons, review, timed practice, and on-device results. The 10-day plan is a course structure, not a promise of a particular outcome within a fixed time. The app does not provide formal examination certification.
License The license for this app obtained through the App Store is governed by Apple's Standard End User License Agreement (EULA). This page provides supplementary product information. It does not replace or limit the Standard EULA or your rights under applicable law.
Purchases This is a paid download. The price shown in the App Store at the time of purchase applies. The current version has no ads, in-app purchases, or subscriptions. Purchases, payments, and refund requests are handled through Apple's relevant processes.
Use and records Use the app lawfully without infringing rights or interfering with services. Learning records are stored locally, without in-app cloud sync or export. Deleting the app, changing devices, or system operations may affect records. Check your device backup settings before taking these actions.
Updates and support Future versions may change lessons or features, as described in release notes. See the Privacy Policy for data practices. Contact the developer through the Support page for assistance.
Rights and responsibilities Learning outcomes depend on practice and individual circumstances. Rights, warranties, and liabilities relating to use of the app are governed by the Standard EULA and applicable law. Nothing here limits consumer rights that cannot be excluded.
Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/