Are there any apps that allow full ladder playoffs?

Basically I want a 2 week ladder playoff, so any top 4 can win, any top 6 can reach 3rd, and any bottom 4 would end up last for losing 2 in a row. I think ESPN does consolation ladders, I prefer Yahoo but I don't think they do ladders at all. I've heard good things about Sleeper. But I don't have any experience with it.