As mentioned, it provides the users a tool to send messages to all the members of their contacts list in one click. WhatSender is a desktop client that intends to solve this. However, the official apps for desktop or browser come with limitations when sending massive messages. Moreover, the messages you send are easier to read, unlike emails. With it, you can easily reach many different users. Due to the number of its users, many companies use this app as a marketing tool. Over the years, WhatsApp has been one of the most used messaging apps in the market.