Netwa - tracker for Whatsapp, Telegram, VK apk content rating is Everyone and can be downloaded and installed on android devices supporting 10 api and above.
"Netwa will help you to be aware, when your friend is online in the social networks Whatsapp, Telegram or Vkontakte. You can view the statistics of the profile activity for each day. Netwa can send a notifications when the profile is online.
Just specify a link to your friend's profile, and from the same time starts monitoring.
After adding a profile Netwa will start to collect statistics of online. You'll know when the profile was online, The statistics shows it.
You can selectively disable or enable the notification in the list of Netwa. Also on the list have a status indicating when the profile has been online for the last time.
other social networks will be added in the next updates"