I was forced to use the iOS app starting this week, after being told I could no longer use the Windows 8 machine in the training room. On the second day, I was surprised I was able to square away 230 reviews in less than 60 Skritter minutes and not many more minutes than that in real-time. I was even more surprised that I was able to get all the way down to 0 reviews almost every single day. It seems all aspects of learning are improved by being able to draw directly on the screen.
The only thing that is really missing right now is the example sentence functionality. And I still feel that the light theme is rather incoherent with its mix of different backgrounds and text cobbled together. The moments that I do stop is almost always due to some annoying user interface element that catches the eye. But I'm grateful for the fact that there is an app at all and that it is a very stable first version. Hats off to the Skritter team.