52 Week Challenge - Mobills is a free finance application available on iPhone developed by MOBILLS LABS SOLUCOES EM TECNOLOGIA LTDA. The app is based on a popular challenge which encourages users to save money. The concept is straightforward: save a small amount each week, starting with $1.00 in the first week and increasing the amount by $1.00 each week. By the end of the year, users will have saved $1,378.00.

The app allows users to add a challenge with a value and start date, and then takes care of managing all dates and values from there. Users can easily track their progress over the weeks and have control over their deposits. Additionally, the app sends weekly notifications as a reminder to make deposits. 52 Week Challenge - Mobills is an ideal solution for those who struggle to plan and save money, and the app's simple interface makes it easy to use.