KakaoTalk is a multiplatform messaging and voice over IP service with Free/Premium versions. It is available for Android, BlackBerry, iOS, Windows Phone, and Symbian. Like WhatsApp, KakaoTalk is different from other messaging services because it does not use a centralized server. Instead, KakaoTalk uses a peer-to-peer communication system, and as such, the company cannot decipher the content of messages and voice calls. KakaoTalk also offers free stickers, an integrated phone directory, and group chat.

WhatsApp

WhatsApp is an instant messaging and voice over IP service that offers both text and voice communication. It is available for Android, BlackBerry, iOS, and Nokia phones. WhatsApp is different from other messaging services because it does not use a centralized server. Instead, WhatsApp uses a peer-to-peer communication system, and as such, the company cannot decipher the content of messages and voice calls.

Threema

Threema is a secure, encrypted messaging application that allows for text, voice, picture, and video messages. It uses end-to-end encryption with public key cryptography, providing forward secrecy with the "Threema Protected Channels".

Telegram

Telegram is a messaging app that lets people send messages and share videos and photos. The app encrypts user’s messages and has a self-destructing message feature.

Line Play

Line Play is a gaming and social networking app with more than 100 million monthly active users. This app is popular in Southeast Asia. Line Play offers games such as puzzles and sports, as well as social networking features such as chat rooms and sharing photos.

WeChat

WeChat is a social networking, messaging, and gaming app with over 700 million monthly active users. It is popular in China and Taiwan. WeChat is a messaging app with features such as voice and video calls, shared photos, and a built-in social media platform.

Viber

Viber is a social networking and messaging app with more than 300 million monthly active users. This app is popular in Israel, Turkey, and Vietnam. Viber is a messaging app that includes voice and video calls, as well as shared photos and emoticons.