WhatsOnline is a free Android app developed by NEBADO that allows you to track the online and offline status of any WhatsApp contact. Whether it's your lover, friend, or someone else, you can easily add their number to be followed and leave the rest to WhatsOnline.

With this app, you can easily keep track of the online and offline status of any WhatsApp contact you want. WhatsOnline records all the status of the followed number to the history list. It also sends a notification to your phone when the person is online or offline.

WhatsOnline is very easy to use. You just need to add the number you want to follow, and the app will do the rest. It's important to note that this app is not an official WhatsApp application and is supported by advertisements.

Overall, if you want to keep track of the online and offline status of any WhatsApp contact, then WhatsOnline is the app for you. It's free, easy to use, and very helpful.