You learn things in the context of where you are when you learn them. If you learn your words in a certain order, you will best be able to reproduce them in that order. If you only learn them in your attic room, at your computer, then you can best reproduce them in that attic room at your computer. So, it is better to study your vocabulary in a variety of places using a variety of methods. With an app on your mobile phone you can study in bed for a little while before getting up, during your breakfast, on the bus, on the playground, at the toilet or even at the bank. In addition, you might want to concentrate extra hard on your studying at the computer now and then. It can also be useful to learn vocabulary using flash cards as well. You can print any Wozzol word list to cut out and leave lying around.
Wozzol exists as a native app for both Android and Apple. In addition, Wozzol is usable as a webapp with means that Wozzol can truly be used anywhere.