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Looks like people don't understand what Syahfi's all about. Here are some random facts..
0. What is it?
Syahfi is a flashcard application. It helps people to memorize something: English/Arabic/Indonesian vocabularies, formulas, etc. You add your own cards. A card is simply a pair of question and answer (for e.g: if you wanna memorize how to read Japanese characters, you add a letter in Kana as a question and how to read it as its answer). When you add a card, you give it a grade. A grade is a rate, how well you remember the card. Grade ranges from 0 to 5; 0 means you can not remember it well. Syahfi is written in JME (it fits on your midp2.0-supported phone), and based on Mnemosyne 1.1 by Peter Bienstman.

1. How does it work?
It's all about schedule. You definitely waste your time when learn something you know well all the time. Syahfi helps you to focus on something that you forget. Remember about grade I've told you before? It's used to schedule the best time for you to learn. The more difficult the card, it will be repeated more often. For instance, a 0-grade card may be repeated once a day, and a 5-grade card is repeated once every 30-40 days. This is called space repetition.

2. Is it really effective?
The algorithm to make the schedule is a modification of SM2-algorithm by Piotr Wozniak, the founder of SuperMemo (it's a commercial flashcard application). Find Piotr's dissertation and scientific articles on his web page, http://supermemo.com.

3. Is Syahfi really really free to use?
Surely, yes. Just download the .jar file from this website. I don't write "consider to buy me a cup of coffee" since I don't drink caffeine. But, I really appreciate your comments, feature request, anything (money included) to help me make it better.

4. Why do you make it?
It's my undergraduate thesis research. It's not easy to tell someone what your research is, with less than 3 words.

5. Any email?
You could contact me, prabowo.murti ^gmail.com. I will reply your mail, soon.