Wtracker is a free Android application developed by LinkinCity Apps, designed for those who want to keep track of their contact's WhatsApp usage. This app enables you to get notified in real-time whenever a contact goes online or offline. Additionally, it allows you to view their last seen time and receive detailed reports of their WhatsApp usage on a daily or weekly basis.

Wtracker is an excellent tool for individuals or businesses who need to monitor up to 10 WhatsApp numbers. With its user-friendly interface and simple design, this app is easy to navigate and use. The app's primary features include the ability to view the last seen time of your contacts, receive notifications whenever a contact goes online or offline, and access detailed reports in daily or weekly views.

Overall, Wtracker is a useful app that can help you stay up-to-date with your contact's WhatsApp usage. It is an excellent tool for individuals or businesses who need to monitor their contacts' WhatsApp activity.