Whats Web for WhatsApp is an app which helps you to use multiple WA accounts on the same device. Using Whats Web for WhatsApp,

Do you want to use two WhatsApp whatsweb accounts in same device?

Whats Web

This app will help you open two WA accounts on the same device or same account on multiple devices by simply scanning the WA Web QR code.

Direct Chat
This feature will help you directly message to other people.

On clicking this inside application redirect you to a QR code. You just have to scan it with WhatsApp web scanner.which will let you use another whatsapp account.
Whatscan for Whatzweb and Whats Web Scan is free app with easy to use UI.