"I had tried dozens of vocabulary memorization programs, which are all disappointing. Except "openbook" (now Vocabilis) and "vocabulary wizard". Openbook has really a virtually excellent memorization algorithm with its rating system. Vocabulary Wizard has no rating system but it has well chosen vocabulary from Toefl, Gre,  etc. You can find these vocabularies through internet. I congratulate you for this labor and expect more..."

- Kurtulus Gunen (Electronic Design Eng.) Ankara-TURKEY

"Thank you for such a useful tool! I have been using it almost every day and
it has helped me learn many new German words and verbs very quickly. You did
a very good job with OpenBook (now Vocabilis)." - Sean Staats

"I have been using Open Book (now Vocabilis) for a couple of months now and can highly recommend it.
It is flexible enough to work the way I do. In the past whenever I have made a
resolution to do something like learn a new language I would find myself doing other more pressing things or simply forgetting to do it."

"But when I tried Open Book (now Vocabilis) it worked differently. The program parameters are easily customized. When I was working away on my computer suddenly a word would pop up with a list of choices. All I had to do was click what I thought would be the right answer and either a new word would appear or the correct answer would be highlighted. After a preset number of words the program would disappear and I would be back doing my regular work. It was fun and easy and I soon found myself wishing that the words would hurry up and appear again."

"Before long I found that I was learning the words effortlessly. But suddenly the presentation changed and the word was displayed without any choices. I had to remember it on my own. This was harder but only for a short time. After preset number of seconds the correct answer would pop up and I could click a button choice to say whether I knew the word or didn't. Some of the words I knew right away and some took a few tries to remember. After a short time this was just as easy and fun as the first way."

"By now I was again starting to feel smug about how fast I was learning the words but the program had another surprise. The presentation changed again and this time I had to type in the word from the keyboard. This temporarily took care of the pride issue.  But presently this too became easier and I found that by now I had completely learned the words and really enjoyed the process. After going through the list this way I was taken back to the first method with new words. The program introduces new words gradually, while reviewing the old ones. It is the most thorough way of learning and certainly the most fun that I've ever tried. I highly recommend it. The price is right and the email support is first class." - Don Stickle