Check User WA for Whatsapp is a free Android app developed by fuseup. It falls under the category of Business & Productivity and allows you to send WhatsApp messages without saving the phone number in your contact list. The app comes in handy when you need to send a message to someone who is not on your contact list.

The app is easy to use and has a simple interface. You can enter the number you want to send a message to and start typing your message. The app also lets you preview the message before sending it. Additionally, you can save frequently used numbers in the app for quick access.