Zap sem Contato is an Android application that allows you to start a WhatsApp conversation with someone without having to save their phone number in your contacts. This is made possible through the Click to Chat feature of WhatsApp, where you can send a link that will allow the recipient to initiate a chat with you without having to add you to their contacts.

The app is simple and straightforward to use. Once you have installed it on your phone, you can simply enter the phone number of the person you want to chat with and generate a link. You can then share this link through any messaging app or social media platform. When the recipient clicks on the link, it will take them directly to the WhatsApp chat with you.

Zap sem Contato is a free app and is useful for anyone who wants to start a conversation with someone on WhatsApp but doesn't want to save their phone number in their contacts. It is especially helpful for businesses that want to provide a quick and convenient way for their customers to reach out to them on WhatsApp.