Hi everyone, long time lurker, first time poster. Thought I would share an app I've worked on for the past year. It's an app designed for students to be able to insert assignments for a class and then put in the score they got for it. Gradr can then work out data like what you're current grade is as well as what you need to average in the remainder of the class to obtain certain grades. It can calculate your GPA and even includes 3D Touch support! All my friends tell me it's a neat idea (got the idea from a close friend who struggled to work out what their current grade for a class was) so I thought I should get some thoughts from you guys! Normally I price it around .99USD but I'll leave it for free for the next couple of days if any students here want to try it 
www.appstore.com/gradr
www.appstore.com/gradr