This app is just a helper for WhatsApp application, it helps you to chat with non-contacts without saving them on your phone.
WhatZap supports both WhatsApp and WhatsApp Business and lets you select one of your pre-saved messages to send it.
How does it work?
1. Write a phone number or select one of the numbers that you sent before and saved in history.
2. Write a message or select a message from your pre-written messages, and still, you can edit it before sending.
3. Choose WhatsApp button for direct sending via WhatsApp application, or choose the other button for direct sending via WhatsApp Business.
As you can see, now you have the ability to direct chat with non-saved numbers in your contact list, just write a number and start the conversation, on the contrary, before WhatsApp enforces you to save the number as a contact before letting you chat with it.
Note: WhatZap supports all of the countries, and it can detect your country in the first use.