You can Write Numbers and send messages to unsaved numbers that is not saved in your contacts list or you can select contact from your Recent call logs.

so when you want to send just something only once you don't need to save temporary phone numbers.

- How Direct Chat works?
1. Enter a number to which you are going to send message, put country code and phone numbers differently.
2. Type your text message and tap on send button.
3. This will take you to the official WhatsApp app then a chat window is created on WhatsApp with given number.

Note - This app or app developer is not associated with WhatsApp. WhatsApp is a registered trademark of WhatsApp Inc. You should follow WhatsApp's terms & condition while sending messages through WhatsDirect App.