Chillz is a free, multiplatform messaging app that lets you make video and voice calls, send text messages, and more — all with just a Wi-Fi connection. With over 2 billion active users, Chillz is especially popular among friends and family who live in different countries and want to stay in touch. is free to download messenger app for smartphones. Chillz uses the internet to send messages, images, audio or video. The service is very similar to text messaging services, however, because Chillz uses the internet to send messages, the cost of using Chillz is significantly less than texting.