A free program for Android, by Smartools.

Open for WhatsApp is a handy app that allows you to open WhatsApp Messenger conversations with any number even if you don’t add it to your contact list.

You can open a chat directly from the number you enter, without the need to save it to your contact list. 

This app will help you save time and effort by saving your contacts and phone numbers for future use. It will also allow you to open a chat with yourself or any other number in WhatsApp, for a quick and easy conversation.

So if you’re looking for a way to save time and effort when opening a chat, this app is definitely worth checking out.