To say the truth your wellness tracker must be something unique and original as competition in this segment is extremely large. There are a lot of already existing charge-free and beloved fitness applications on PlayMarket. Your one should beat them all to become popular and wildly-used.
Competition is very tough with applications that are not paid, lots can be found but maybe there is one advantage of this project for people who are sure to use the application. There must be a new idea that surprises a lot of people.