Users have a choice of 3 chalk thicknesses in 6 different colors. To erase, choose the tool or simply shake the device.
Work can be saved to the photos folder or emailed out.
Overall, this app is way too simple to be a paid one. Yes it gives students one more way to do work; I envision this being useful during math class. However, there are other apps out there (such as Screen Chomp) that do more for less. Download it if you find it for free one day or if money is no object. Otherwise, skip it.