You do not need to know financial math. Simply provide your purchase numbers:- spot price- number of installments without interest.The app informs from which discount is worth making the purchase in cash. All simple and with friendly interface. At the time of purchase, you have the right tip to spend less.Is it better to buy cash or credit? The app recommends the best solution between buying cash at a discount or interest-free installments. The recommendation takes into account the number of installments, the discount offered on the spot price and the rate of return that the buyer gets for their investments.