I've taken some screenshots to show you how it works (on the website there are no instructions, no information, and no previews).
First of all, it's available in the following languages:
Once you've chosen which language you speak and which you want to learn, you're taken to a main screen that looks like this:
Each time you press OK a new word is shown until you have finished a small series of words that comprise a level. At the end of a level you are time-tested on the words you've learned. If you fail you repeat the level, if you pass you move on to the next level and a new series of words.
That's all there is to it. For myself the retension seems to be high, I did the first two levels yesterday and can still recall all the words.
The website is found here: http://albis.vetsin.com/