WhatsApp Sender is a software for sending messages to your own contacts from phone by connecting phone through USB or Wi-Fi. It also allows to filter numbers to extract WhatsApp and Non WhatsApp numbers. This tool is more like a robot sending messages as if human is sending, but in much faster speed obviously. We have used unique techniques to tap (touch) exactly on send button in WhatsApp Conversation screen, does not matter what resolution phone has. It also checks for Non-WhatsApp number while sending.
I have 10+ years of experience in programming. I have develop many desktop apps like Bulk SMS Software, Whatsapp Marketing Software, Appointment Management Software, Identity Card Designing Software etc. There's many more to the list. For android I have developed 5-6 app about SMS, Call, Appointment etc.