If you're thinking about developing a cashback app, there are a few things you need to take into account in terms of cost. First, you'll need to hire a competent development team. While you could try to build the app yourself, it's likely that you don't have the necessary skills and experience. Second, you'll need to purchase a license for the cashback software. This will be a recurring cost, so be sure to factor it into your budget. Finally, you'll need to promote your app and get people to use it. This will require some marketing spend, so again, be sure to factor this into your budget. All in all, the cost of developing a cashback app can vary depending on your specific requirements. However, if you're prepared to invest the time and money, it could be a very successful venture.