For just 5$ you get Pro Account for 1 year.
Some Features of Pro Account:
1. 365 Days history in reports
2. Auto reminder to update Namaaz habits
3. Detail Dashboard with more graphs.
4. Update the account using emails.
5. Any new feature develop will be by default available to you.
6. You can set your default Namaaz Habits from Settings > Profile menu. This will auto update it every day so that you need to update only if there are any changes (eg: Prayed namaaz in Masjid on Friday etc)
For more information click here