Cross-Platform Tuition Management App

I run a tuition centre that serves roughly 200 students every year and I need a single application that works seamlessly on iOS, Android, Windows and macOS. The core job is to build an app that lets me:

• Take attendance by manual entry, automatically logging the exact date and time for every class.
• Enter and review test marks so I can track each student’s academic progress across the term.
• Record homework submissions, including notes on delays or incomplete work, so parents and I can follow up quickly.

A clean, teacher-friendly interface is essential because classes move fast and data has to be entered on the spot. The student list changes yearly, so importing a new roster at the start of each session should be painless—CSV upload or a simple form is fine. I also want quick reporting: at minimum, weekly attendance percentages, average marks per test and a log of missing homework.

Data should sync in real time (or as close as possible) so anything recorded on my phone appears instantly on the desktop version and vice versa. I’m open to whichever stack you prefer—Flutter, React Native, .NET MAUI, Electron, or another proven cross-platform framework—as long as the final build is stable and easy to update.

Deliverables
1. Source code with brief setup instructions.
2. Installable builds for iOS, Android, Windows and macOS.
3. A lightweight admin guide covering user account creation, yearly roster import and basic troubleshooting.
4. One round of revisions after initial hand-over to iron out any small UI or workflow issues I spot during live use.

If you can suggest future-ready add-ons, such as QR or biometric attendance to complement manual entry, feel free to note them, though they’re not required for this phase.