Well, SheetZoom is the first step of a bigger product and we would like early adopters to use it free, yes absolutely free for at least 6 months. There is no catch, we want our product to be used and we would love to get your feedback to further develop it.
No and Yes. If you want to use the online version of Excel, you don’t need a license and you don’t need a Microsoft account. If you want to use the desktop version, YES, you need to have Microsoft 2016 licensed.