Free Trial means free trial, why you are asking card details, if you really want to give extraordinary learning platforms to children so please be honest and put confident on yourself that your app will 100% fruitful for kids, you are giving trial but same time asking card that means you don't have trust on your app, I am having been in this industry since 2006, We never charge first always charge after finshed the course why because I have trust on myself that children will 100% grow.