content: Things you can do for free is becoming more and more limited. Most of the trees are exclusive for the paid version. You cant use combination without the paid version. Most of the updates are only for the pro version and some features previously free now must be paid for. The free version used to be good too but now get ready to spend some money. The free app is a disguise. the good things are now behind a pay wall. Not that its bad just a warning you have to pay for it.