Rapid Productivity Utility App Development

I need a self-contained utility app whose sole purpose is to boost day-to-day productivity. Think quick-fire tools such as smart to-do lists, reminders, or time-tracking widgets—whatever combination will genuinely help users get more done with less friction... (Budget: ₹1500 - ₹12500 INR, Jobs: Flutter, iOS, iPhone, Mobile App Development, Objective C, React Native, UX / User Experience)