it has something to do with the pH in your urine. scam of course. but i guess it would still be fun to do :)
Im with the others. Absolutely a scam - spend your money on something nice for the baby (or yourself) instead.
I also think it's a total scam and waste of money. You can buy a lot for baby with that amount of money instead.
I have tried it and it is a scam. It's a big money maker right now. I just did it for fun and it was wrong anyway. It said girl for me and I had a boy and it was confirmed by u/s as well. Oh well! I'm sure everyone knows the only accurate way is by u/s or waiting until baby is born. =)