The web app is the additional service and still needs the official app installed on your mobile device. In order to use the web app service all you need is a browser (Google Chrome on Windows, Mac, Linux, and Chrome OS and support for more browsers are coming soon).
Mobile devices, Windows Phone, Blackberry 10 and Android, will get an update for WhatsApp today. But the web app currently is not for iOS users as said by Jan Koum, “Unfortunately, for now, we will not be able to provide web client to our iOS users due to Apple platform limitations.“
Using web app is very simple –
- In the new tab open web app.
- Scan the QR code with the WhatsApp mobile app.
- You’re done! You are signed in now.