WhatsTracker app gives you ability of tracking your selected whatsapp contacts and show their daily activities in details.
Here are some features from WhatsTracker ;
-You can see online and offline times.
-You can see daily online count.
-You can see total spent time on whatsapp.
If user let everyone to see his/her profile,
-You can see profile picture.
-You can see last status message.
Disclaimer : WhatsTracker is not affiliated with any third party including Whasapp inc.