I've been using Kamar on ios for over 2 weeks and it's doing the job of reporting absences pretty well! Our school has good wifi coverage so I can complete absences at the pool and on the back fields, as
well as in the gym and other classrooms. This is essential for 'early notification' for parents of boys who haven't made it to school yet!!
Most of the options are there which you can usually see on the desktop version (student details are good at the start of the year if you don't know the names of all of your pupils you can check out the pictures!). The app is also useful to use to show students their attendance and ask where they were in specific lessons - all the data is live on the app - Senior students can also see an update of how many credits they have earned and what they received last year. The amount of data available is amazing and i'm sure there a quite a few things that I haven't had the chance to look at yet! Student notices and events planner are also included but we don't use those at our school yet.....
One thing I would like to see on the app is an option to add data for reporting. I emailed Kamar help desk - who are really helpful and always reply really quickly, and they let me know that this may be an option in the future, this would be great for PE as we would be able to enter beep test scores and skills assessments in the field and they would go straight on the report!