On iOs I can tell, but I would venture to suggest the web.
The priorities are healthmonth.com/
if habits need. Free to choose three healthy habits (not eating sweets, going to the gym, read half an hour a day or whatever you do) and check in at the specified time on the implementation, to glasses, to keep track of statistics. A greater number of habits and reminders is something about 5$. The contract for the month is created once and not changed until the next.
There are Russian, more fancy option, with the mobile web version is more like a social network www.advirtus.ru/