WhatsApp is now also available on the Mac.
I have installed the Whatapp App for Mac on my mac. After opening the App on the Mac you must go towards your iPhone under settings. There you can scan the QR-Code displayed on the mac and immediately you have a copy of your Whatsapp-account on your mac. This works only while the iPhone is connected and has connection to the internet. But a great thing because you can write whatsapps with your normal keybord on our Mac.
You can find the download under: https://www.whatsapp.com/
Strenggenommen handelt es sich um eine Web-Applikation.