I’m looking to license or purchase a fully-functional, bug-free math learning app that is already built and can be rebranded for anyone (roughly 10-70 years old). The core content should cover key math skills—algebra, geometry, basic calculus, or any engaging practice modules—and present them through interactive lessons, quizzes, or games that keep teens motivated. Please note I’m only interested in products that already exist and have been tested with real users. When you respond, attach or link to past work that proves stability, an intuitive UI/UX, and measurable learning outcomes. If your portfolio includes usage statistics, user feedback, or store ratings, that will help me evaluate faster. My ideal hand-off includes: • The latest source code (Android, iOS, or cross-platform frameworks like Flutter or React Native are welcome) • Clear instructions for rebranding (logo, color scheme, language files) • Admin or analytics dashboard, if available, so I can track student progress and retention • A straightforward way to add or update question banks in the future If your solution supports offline play, adaptive difficulty, or rewards/badges, let me know—that’s a plus but not mandatory. I’m ready to move quickly once I see a demo or TestFlight/APK build that confirms performance and content quality.