I am currently having issues with the site syncing to my Fitbit app - Samsung Galaxy S5 - my Fitbit app updates normally, but it takes way longer than 4 hours for Achievemint to catch up. I didn't know the app was for iPhones only when I signed up on the website. But I also don't know of any apps that are similar to it, in that they reward with money and not other types of rewards.
