Latest questions about "whatsdog"

I had Whatsdog in my phone working fine, but the app crashed and I uninstalled it. After a few days there was a trial done to check the stability, but didn't show up on my phone.

Is there any other app which prompts you or gives out a notification when a contact comes online? Like Whatsdog was one of those, but that is just not working for me.

Why isn't WhatsDog working anymore?

I'm trying to download Whatsdog free from Play Store but there is a message saying: "Versione notte compatible with your device. I have a Samsung S Advance.