The Last Seen - Online Tracker is a useful tool that will help you to track the online status of your child, family member, or friend. You can add all the contacts you want to the app, and then you can set the tracking period for each of them. It will send you notifications every time your child, family member, or friend goes online or offline on WhatsApp.

This application also has a clock view that lets you check all the time durations for each day. It is especially useful if you are looking forward to someone but he/she isn't always there.