Notification App

I put an item up for sale, closed the game, and am waiting. I keep checking the trade page to see if my item has sold. Is there an app that sends me a notification when my item is sold?

post it for a price it will actually sell for and this isnt an issue

Why do that though? Just keep the game running in the background instead of checking some other ways? and if you want to sell fast - sell cheaper.

To answer your question; I'm personally not aware of any official apps that can do that.