WhatsApp is the most popular messaging and voice calling app in the world, with over 2 billion users. It offers end-to-end encryption, group chats, video calls, and voice messages. It has a dominant position in many regions, especially in Latin America, Africa, and Asia.
Skype is one of the oldest and most widely used VoIP services, with over 300 million monthly active users. It offers free voice and video calls, instant messaging, screen sharing, and file transfer. It also has a paid service that allows users to call landlines and mobile phones, and access Skype for Business features.
Zoom is a newer and fast-growing VoIP service that specializes in video conferencing and online meetings. It has over 300 million daily meeting participants, and offers features such as cloud recording, breakout rooms, chat, and virtual backgrounds. It has gained popularity during the COVID-19 pandemic, as many people and organizations switched to remote work and education.
FaceTime is a VoIP service that is exclusive to Apple devices, such as iPhones, iPads, and Macs. It allows users to make free voice and video calls, as well as group calls with up to 32 people. It has a loyal user base among Apple fans, and integrates well with other Apple services and features.
WeChat is a multifunctional messaging and social media app that is dominant in China, with over 1.2 billion monthly active users. It offers voice and video calls, group chats, stickers, mini programs, payments, and other services. It is widely used for both personal and business purposes, and faces little competition in its home market.