Skritter is great in the sense that it allows you to practice your Chinese hand-writing, at the same time as you get feedback from the application. You can use it on your smartphone or iPad and teaches you standard character composition and stroke order.
The difference between Skritter and many other applications is that you will understand if you’re correct or not. The application has a scratchpad that allows you to write and practice the characters you want. Skritter is comparably expensive, even if you get a week for free. The plans are as follows:
1 Month – USD 14.99
6 Months – USD 59.99
1 Year – USD 99.99
2 Years – USD 179.99