Send Direct Message- WhatsUser description

WhatsUser allows you to send a message to anyone without saving their number. You did not need to save their number in your address book and it will directly send the message to the user. You can also just check their DPs and status, without saving their number.
This app is very easy to use.
The process is simple:-
1. First Select Country code and Enter the number. (Whom you want to send)
2. Then you can or not enter the message, and click on send button.
This will open up their number in WhatsApp and the number will also not saves\d.

This app has also a web version. Owned by Kanu Tech.
http://whatsuser.com
This website also supports the same thing and also supports web whatsapp.