WhatsOpen is a simple tool for WhatsApp that allows you to send messages to any numbers not saved in your contacts list. It helps you to start chatting without saving the number, keeping your phonebook clean. The app is useful in situations where you want to contact someone without saving their number, like sending messages to delivery boys or keeping important messages by sending messages to yourself on WhatsApp. WhatsOpen has a simple and familiar interface, and it allows secret messaging without contact saving.

To use the app, you just need to open it and enter the number to which you want to send a message. Then, type your text message and tap on the "Open chat" button. The official WhatsApp app will be opened with a chat window with the given number. No contact is created on the device, so you do not need to save the number on your contact list in order to open the chat.

The app keeps a history of all recent numbers in the "History" tab, so you can easily access them again. WhatsOpen is free to use and is available on Android. Please note that this app and app developer is not affiliated with WhatsApp Inc.