WhatsApp was authoritatively made accessible for PCs through a web customer, under the name WhatsApp Web, in late January 2015 through a declaration made by Koum on his Facebook page: "Our web customer is essentially an expansion of your telephone: the web program mirrors discussions and messages from your cell phone—this implies the majority of your messages still live on your telephone". The WhatsApp client's handset should at present be associated with the Internet for the program application to work. All significant desktop programs are upheld aside from Microsoft Internet Explorer. WhatsApp Web's UI depends on the default Android one.

As of January 21, 2015, the desktop adaptation was just accessible to Android, BlackBerry and Windows Phone clients. Later on, it additionally included backing for iOS, Nokia Series 40, and Nokia S60 .

An informal subordinate called WhatsAppTime has been produced, which is a standard Win32 application for PCs and backings warnings through the Windows notice area.There are comparative answers for Mac OS X, for example, the open-source ChitChat and various wrappers accessible in the App Store.