I used Sikuli couple of years ago, that time, it was not able to work if computer is locked (I used image hooks). However I am satisfied enough with AutoIt that

I used Sikuli couple of years ago, that time, it was not able to work if computer is locked (I used image hooks). However I am satisfied enough with AutoIt that, I might not look at other tools in couple of next few years, it has helpful community at forums and stackoverflow.