A free program for Android, by Ehab Reda.

EzChat is the #1 WhatsApp App for Business. It allows you to save all your business contacts in one secure database, eliminating the need to clutter your personal mobile contact list.

You can save contacts by pasting a phone number into the app, clicking on any number in any other app, or selecting a contact from your recent calls or chats.

EzChat also has the option to categorize and search using keywords, making it easy to find any contact within seconds.

It also has the option to add a phone number to your account, so you can start sending messages to the person instantly.

EzChat also allows you to view the history of numbers you've previously messaged, making it easy to pick up where you left off.