Send a WhatsApp direct without adding to your contact list
Tap and add to homescreen to install this service as a web app
How to send WhatsApp message without saving the phone number? That is what this WhatsApp direct service is for. You want to sent a WhatsApp message without going to the trouble of adding someone to your contact list. You just don't want to bloat your contacts with everyone you ever have sent a WhatsApp message. This service is for you:
NCA - nocontactapp - lets you send WhatsApp messages to unkown contacts.
Also using Signal, SMS or iMessage? Try gotext.us