I really want to try it because I think I need something like this.

However, how do I know it is a legitimate product and not some virus/scam software?

I know YC is a vote of confidence, if it is a YC company, and all the copy sounds legit, and you sound like a pair of honest, hard working entrepreneurs.

But is there some way to check before I run the software?

Edit: Note that I would not have this concern if it were a web platform like Kimono used to be.