WhatsMe is a free Android app developed by MW Developers that allows you to open a chat with anyone on WhatsApp without saving their number on your phone. As we all know, we cannot initiate a chat on WhatsApp without saving the contact, but with WhatsMe, you can easily do it by simply typing the number of the person you want to chat with and clicking on "open chat."

In addition to this, WhatsMe also lets you start a conversation with yourself, which is not possible on WhatsApp. The app is straightforward to use, with just a textbox to enter the number and a button to open the chat.

Overall, WhatsMe is a useful tool that simplifies the process of initiating chats on WhatsApp, especially when you don't want to clutter your contacts list with unnecessary numbers.