WhatsApp Messenger has hit a new milestone with a staggering 800 million active monthly users.

One of the leading instant messaging apps for smartphones, WhatsApp has surpassed 800 million monthly active users, its chief executive and co-founder Jan Koum announced via a Facebook post.

The company had crossed 700 million active users in January and has since added 100 million users in just a span of four months. In addition, the latest version of WhatsApp for Android has made its way to the Web with backup/restore options for chat history and media via Google Drive.

That said, WhatsApp's official site still shows version 2.12.44, indicating that it might take some time to release the latest version.

At the time, Koum said WhatsApp members were sending out 30 billion messages every day. He has not shared the figures of daily messages sent this month, according to USAToday.

In his Facebook post, Koum talks about the difference between active and registered users, slamming other services that mostly make announcements about registered numbers.

"WhatsApp - now serving 800,000,000 monthly active users. Reminder for the press out there: active and registered users are not the same thing," Koum said.

Citing the rate of growth in number of monthly active users, the widely popular text app is slated to cross the 1 billion monthly user milestones by the end of 2015, according to NDTVGadgets.

An increasing number of instant messaging apps, such as Hike, Line, WeChat and Facebook's Messenger, WhatsApp, has continued to remain significant for users. With the latest addition of popular voice calling feature for all Android users, things only seem to be getting better for WhatsApp.

The voice calling feature is slated to land on iOS and Windows Phones soon.

The app is reportedly No. 1 in Italy, Spain, England and Germany in the latest iTunes app download chart this week, but it's at No. 18 in the U.S.A.

Topping the chart in the United States is Facebook's Messenger.