How much traction (in terms of for instance sessions per day) does your Stack App get? What have you done to spread the word about your app?

My experience from my first Stack App (StackRating) is that it's tough to get good traction. I have no idea if I've failed on my idea, or the implementation, or if I simply haven't reached out to enough people.

I posted two posts on Reddit and announced my app here at Stack Apps. Got some traction the first 2 days, and then it basically flatlined:

Please share your experience and advice.