NicePlan is a very clean Timetable with a smart Home tab. Don't have much time? Just take a look at the Home tab or the widget. They'll intelligently show you the things you need to know the most. NicePlan is suited with convenient lesson editor, import and export* features, modern and simple design, Dark Mode*, A and B weeks*, 3D Touch shortcuts and widget (available also on the lock screen).
Energy Tracker lets you track how are you feeling through the day. You can be notified with a reminder (so you don't even have to open the app). Or just force touch the app icon and choose how are you. Then see your enegry level on a readable chart!
Want to quickly calculate compound? This is the best app to do so. With a simple and intuitive interface it's incredibly easy to enter the data. Then you can see it visualized on a chart - updated live.