WOnline - WhatStat Online Trac is a free Android application developed by Alexis Crystal. It falls under the category of Utilities & Tools and serves as the best application to track online and last seen status on Whatsapp.

The application provides an easy-to-use interface that allows users to monitor the online status of their Whatsapp contacts. It also tracks the last seen status of contacts, which can be useful in certain situations. The application is lightweight and runs smoothly on most Android devices.

Overall, WOnline - WhatStat Online Trac is a great utility tool for Whatsapp users who want to keep track of their contacts' online and last seen status. The application is free and provides accurate information, making it a must-have for Whatsapp users.