Does the bacon app cost money?

Hello there, I'm just curious about something related to the bacon app that I've heard people talking about. Does using the bacon app actually cost any money? I mean, do you have to pay for it upfront, or are there any in-app purchases that you might encounter? I'm just trying to get a better understanding of the financial aspect of this app before I decide to download and use it. Thanks in advance for your help with this question!